1 /*
2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
33 *
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions are met:
38 *
39 * * Redistributions of source code must retain the above copyright notice,
40 * this list of conditions and the following disclaimer.
41 *
42 * * Redistributions in binary form must reproduce the above copyright notice,
43 * this list of conditions and the following disclaimer in the documentation
44 * and/or other materials provided with the distribution.
45 *
46 * * Neither the name of JSR-310 nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
54 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
55 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
56 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
59 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
60 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 package java.time;
63
64 import static java.time.LocalTime.HOURS_PER_DAY;
65 import static java.time.LocalTime.MICROS_PER_DAY;
66 import static java.time.LocalTime.MILLIS_PER_DAY;
67 import static java.time.LocalTime.MINUTES_PER_DAY;
68 import static java.time.LocalTime.NANOS_PER_DAY;
69 import static java.time.LocalTime.NANOS_PER_HOUR;
70 import static java.time.LocalTime.NANOS_PER_MINUTE;
71 import static java.time.LocalTime.NANOS_PER_SECOND;
72 import static java.time.LocalTime.SECONDS_PER_DAY;
73 import static java.time.temporal.ChronoField.NANO_OF_SECOND;
74
75 import java.io.DataInput;
76 import java.io.DataOutput;
77 import java.io.IOException;
78 import java.io.InvalidObjectException;
79 import java.io.ObjectInputStream;
80 import java.io.Serializable;
81 import java.time.chrono.ChronoLocalDateTime;
82 import java.time.format.DateTimeFormatter;
83 import java.time.format.DateTimeParseException;
84 import java.time.temporal.ChronoField;
85 import java.time.temporal.ChronoUnit;
86 import java.time.temporal.Temporal;
87 import java.time.temporal.TemporalAccessor;
88 import java.time.temporal.TemporalAdjuster;
89 import java.time.temporal.TemporalAmount;
90 import java.time.temporal.TemporalField;
91 import java.time.temporal.TemporalQueries;
92 import java.time.temporal.TemporalQuery;
93 import java.time.temporal.TemporalUnit;
94 import java.time.temporal.UnsupportedTemporalTypeException;
95 import java.time.temporal.ValueRange;
96 import java.time.zone.ZoneRules;
97 import java.util.Objects;
98
99 /**
100 * A date-time without a time-zone in the ISO-8601 calendar system,
101 * such as {@code 2007-12-03T10:15:30}.
102 * <p>
103 * {@code LocalDateTime} is an immutable date-time object that represents a date-time,
104 * often viewed as year-month-day-hour-minute-second. Other date and time fields,
105 * such as day-of-year, day-of-week and week-of-year, can also be accessed.
106 * Time is represented to nanosecond precision.
107 * For example, the value "2nd October 2007 at 13:45.30.123456789" can be
108 * stored in a {@code LocalDateTime}.
109 * <p>
110 * This class does not store or represent a time-zone.
111 * Instead, it is a description of the date, as used for birthdays, combined with
112 * the local time as seen on a wall clock.
113 * It cannot represent an instant on the time-line without additional information
114 * such as an offset or time-zone.
115 * <p>
116 * The ISO-8601 calendar system is the modern civil calendar system used today
117 * in most of the world. It is equivalent to the proleptic Gregorian calendar
118 * system, in which today's rules for leap years are applied for all time.
119 * For most applications written today, the ISO-8601 rules are entirely suitable.
120 * However, any application that makes use of historical dates, and requires them
121 * to be accurate will find the ISO-8601 approach unsuitable.
122 *
123 * <p>
124 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
125 * class; use of identity-sensitive operations (including reference equality
126 * ({@code ==}), identity hash code, or synchronization) on instances of
127 * {@code LocalDateTime} may have unpredictable results and should be avoided.
128 * The {@code equals} method should be used for comparisons.
129 *
130 * @implSpec
131 * This class is immutable and thread-safe.
132 *
133 * @since 1.8
134 */
135 public final class LocalDateTime
136 implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable {
137
138 /**
139 * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
140 * This is the local date-time of midnight at the start of the minimum date.
141 * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
142 * This could be used by an application as a "far past" date-time.
143 */
144 public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
145 /**
146 * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
147 * This is the local date-time just before midnight at the end of the maximum date.
148 * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
149 * This could be used by an application as a "far future" date-time.
150 */
151 public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);
152
153 /**
154 * Serialization version.
155 */
156 private static final long serialVersionUID = 6207766400415563566L;
157
158 /**
159 * The date part.
160 */
161 private final LocalDate date;
162 /**
163 * The time part.
164 */
165 private final LocalTime time;
166
167 //-----------------------------------------------------------------------
168 /**
169 * Obtains the current date-time from the system clock in the default time-zone.
170 * <p>
171 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
172 * time-zone to obtain the current date-time.
173 * <p>
174 * Using this method will prevent the ability to use an alternate clock for testing
175 * because the clock is hard-coded.
176 *
177 * @return the current date-time using the system clock and default time-zone, not null
178 */
179 public static LocalDateTime now() {
180 return now(Clock.systemDefaultZone());
181 }
182
183 /**
184 * Obtains the current date-time from the system clock in the specified time-zone.
185 * <p>
186 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
187 * Specifying the time-zone avoids dependence on the default time-zone.
188 * <p>
189 * Using this method will prevent the ability to use an alternate clock for testing
190 * because the clock is hard-coded.
191 *
192 * @param zone the zone ID to use, not null
193 * @return the current date-time using the system clock, not null
194 */
195 public static LocalDateTime now(ZoneId zone) {
196 return now(Clock.system(zone));
197 }
198
199 /**
200 * Obtains the current date-time from the specified clock.
201 * <p>
202 * This will query the specified clock to obtain the current date-time.
203 * Using this method allows the use of an alternate clock for testing.
204 * The alternate clock may be introduced using {@link Clock dependency injection}.
205 *
206 * @param clock the clock to use, not null
207 * @return the current date-time, not null
208 */
209 public static LocalDateTime now(Clock clock) {
210 Objects.requireNonNull(clock, "clock");
211 final Instant now = clock.instant(); // called once
212 ZoneOffset offset = clock.getZone().getRules().getOffset(now);
213 return ofEpochSecond(now.getEpochSecond(), now.getNano(), offset);
214 }
215
216 //-----------------------------------------------------------------------
217 /**
218 * Obtains an instance of {@code LocalDateTime} from year, month,
219 * day, hour and minute, setting the second and nanosecond to zero.
220 * <p>
221 * This returns a {@code LocalDateTime} with the specified year, month,
222 * day-of-month, hour and minute.
223 * The day must be valid for the year and month, otherwise an exception will be thrown.
224 * The second and nanosecond fields will be set to zero.
225 *
226 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
227 * @param month the month-of-year to represent, not null
228 * @param dayOfMonth the day-of-month to represent, from 1 to 31
229 * @param hour the hour-of-day to represent, from 0 to 23
230 * @param minute the minute-of-hour to represent, from 0 to 59
231 * @return the local date-time, not null
232 * @throws DateTimeException if the value of any field is out of range,
233 * or if the day-of-month is invalid for the month-year
234 */
235 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute) {
236 LocalDate date = LocalDate.of(year, month, dayOfMonth);
237 LocalTime time = LocalTime.of(hour, minute);
238 return new LocalDateTime(date, time);
239 }
240
241 /**
242 * Obtains an instance of {@code LocalDateTime} from year, month,
243 * day, hour, minute and second, setting the nanosecond to zero.
244 * <p>
245 * This returns a {@code LocalDateTime} with the specified year, month,
246 * day-of-month, hour, minute and second.
247 * The day must be valid for the year and month, otherwise an exception will be thrown.
248 * The nanosecond field will be set to zero.
249 *
250 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
251 * @param month the month-of-year to represent, not null
252 * @param dayOfMonth the day-of-month to represent, from 1 to 31
253 * @param hour the hour-of-day to represent, from 0 to 23
254 * @param minute the minute-of-hour to represent, from 0 to 59
255 * @param second the second-of-minute to represent, from 0 to 59
256 * @return the local date-time, not null
257 * @throws DateTimeException if the value of any field is out of range,
258 * or if the day-of-month is invalid for the month-year
259 */
260 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) {
261 LocalDate date = LocalDate.of(year, month, dayOfMonth);
262 LocalTime time = LocalTime.of(hour, minute, second);
263 return new LocalDateTime(date, time);
264 }
265
266 /**
267 * Obtains an instance of {@code LocalDateTime} from year, month,
268 * day, hour, minute, second and nanosecond.
269 * <p>
270 * This returns a {@code LocalDateTime} with the specified year, month,
271 * day-of-month, hour, minute, second and nanosecond.
272 * The day must be valid for the year and month, otherwise an exception will be thrown.
273 *
274 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
275 * @param month the month-of-year to represent, not null
276 * @param dayOfMonth the day-of-month to represent, from 1 to 31
277 * @param hour the hour-of-day to represent, from 0 to 23
278 * @param minute the minute-of-hour to represent, from 0 to 59
279 * @param second the second-of-minute to represent, from 0 to 59
280 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
281 * @return the local date-time, not null
282 * @throws DateTimeException if the value of any field is out of range,
283 * or if the day-of-month is invalid for the month-year
284 */
285 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
286 LocalDate date = LocalDate.of(year, month, dayOfMonth);
287 LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
288 return new LocalDateTime(date, time);
289 }
290
291 //-----------------------------------------------------------------------
292 /**
293 * Obtains an instance of {@code LocalDateTime} from year, month,
294 * day, hour and minute, setting the second and nanosecond to zero.
295 * <p>
296 * This returns a {@code LocalDateTime} with the specified year, month,
297 * day-of-month, hour and minute.
298 * The day must be valid for the year and month, otherwise an exception will be thrown.
299 * The second and nanosecond fields will be set to zero.
300 *
301 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
302 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
303 * @param dayOfMonth the day-of-month to represent, from 1 to 31
304 * @param hour the hour-of-day to represent, from 0 to 23
305 * @param minute the minute-of-hour to represent, from 0 to 59
306 * @return the local date-time, not null
307 * @throws DateTimeException if the value of any field is out of range,
308 * or if the day-of-month is invalid for the month-year
309 */
310 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute) {
311 LocalDate date = LocalDate.of(year, month, dayOfMonth);
312 LocalTime time = LocalTime.of(hour, minute);
313 return new LocalDateTime(date, time);
314 }
315
316 /**
317 * Obtains an instance of {@code LocalDateTime} from year, month,
318 * day, hour, minute and second, setting the nanosecond to zero.
319 * <p>
320 * This returns a {@code LocalDateTime} with the specified year, month,
321 * day-of-month, hour, minute and second.
322 * The day must be valid for the year and month, otherwise an exception will be thrown.
323 * The nanosecond field will be set to zero.
324 *
325 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
326 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
327 * @param dayOfMonth the day-of-month to represent, from 1 to 31
328 * @param hour the hour-of-day to represent, from 0 to 23
329 * @param minute the minute-of-hour to represent, from 0 to 59
330 * @param second the second-of-minute to represent, from 0 to 59
331 * @return the local date-time, not null
332 * @throws DateTimeException if the value of any field is out of range,
333 * or if the day-of-month is invalid for the month-year
334 */
335 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second) {
336 LocalDate date = LocalDate.of(year, month, dayOfMonth);
337 LocalTime time = LocalTime.of(hour, minute, second);
338 return new LocalDateTime(date, time);
339 }
340
341 /**
342 * Obtains an instance of {@code LocalDateTime} from year, month,
343 * day, hour, minute, second and nanosecond.
344 * <p>
345 * This returns a {@code LocalDateTime} with the specified year, month,
346 * day-of-month, hour, minute, second and nanosecond.
347 * The day must be valid for the year and month, otherwise an exception will be thrown.
348 *
349 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
350 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
351 * @param dayOfMonth the day-of-month to represent, from 1 to 31
352 * @param hour the hour-of-day to represent, from 0 to 23
353 * @param minute the minute-of-hour to represent, from 0 to 59
354 * @param second the second-of-minute to represent, from 0 to 59
355 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
356 * @return the local date-time, not null
357 * @throws DateTimeException if the value of any field is out of range,
358 * or if the day-of-month is invalid for the month-year
359 */
360 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
361 LocalDate date = LocalDate.of(year, month, dayOfMonth);
362 LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
363 return new LocalDateTime(date, time);
364 }
365
366 /**
367 * Obtains an instance of {@code LocalDateTime} from a date and time.
368 *
369 * @param date the local date, not null
370 * @param time the local time, not null
371 * @return the local date-time, not null
372 */
373 public static LocalDateTime of(LocalDate date, LocalTime time) {
374 Objects.requireNonNull(date, "date");
375 Objects.requireNonNull(time, "time");
376 return new LocalDateTime(date, time);
377 }
378
379 //-------------------------------------------------------------------------
380 /**
381 * Obtains an instance of {@code LocalDateTime} from an {@code Instant} and zone ID.
382 * <p>
383 * This creates a local date-time based on the specified instant.
384 * First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
385 * which is simple as there is only one valid offset for each instant.
386 * Then, the instant and offset are used to calculate the local date-time.
387 *
388 * @param instant the instant to create the date-time from, not null
389 * @param zone the time-zone, which may be an offset, not null
390 * @return the local date-time, not null
391 * @throws DateTimeException if the result exceeds the supported range
392 */
393 public static LocalDateTime ofInstant(Instant instant, ZoneId zone) {
394 Objects.requireNonNull(instant, "instant");
395 Objects.requireNonNull(zone, "zone");
396 ZoneRules rules = zone.getRules();
397 ZoneOffset offset = rules.getOffset(instant);
398 return ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
399 }
400
401 /**
402 * Obtains an instance of {@code LocalDateTime} using seconds from the
403 * epoch of 1970-01-01T00:00:00Z.
404 * <p>
405 * This allows the {@link ChronoField#INSTANT_SECONDS epoch-second} field
406 * to be converted to a local date-time. This is primarily intended for
407 * low-level conversions rather than general application usage.
408 *
409 * @param epochSecond the number of seconds from the epoch of 1970-01-01T00:00:00Z
410 * @param nanoOfSecond the nanosecond within the second, from 0 to 999,999,999
411 * @param offset the zone offset, not null
412 * @return the local date-time, not null
413 * @throws DateTimeException if the result exceeds the supported range,
414 * or if the nano-of-second is invalid
415 */
416 public static LocalDateTime ofEpochSecond(long epochSecond, int nanoOfSecond, ZoneOffset offset) {
417 Objects.requireNonNull(offset, "offset");
418 NANO_OF_SECOND.checkValidValue(nanoOfSecond);
419 long localSecond = epochSecond + offset.getTotalSeconds(); // overflow caught later
420 long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY);
421 int secsOfDay = Math.floorMod(localSecond, SECONDS_PER_DAY);
422 LocalDate date = LocalDate.ofEpochDay(localEpochDay);
423 LocalTime time = LocalTime.ofNanoOfDay(secsOfDay * NANOS_PER_SECOND + nanoOfSecond);
424 return new LocalDateTime(date, time);
425 }
426
427 //-----------------------------------------------------------------------
428 /**
429 * Obtains an instance of {@code LocalDateTime} from a temporal object.
430 * <p>
431 * This obtains a local date-time based on the specified temporal.
432 * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
433 * which this factory converts to an instance of {@code LocalDateTime}.
434 * <p>
435 * The conversion extracts and combines the {@code LocalDate} and the
436 * {@code LocalTime} from the temporal object.
437 * Implementations are permitted to perform optimizations such as accessing
438 * those fields that are equivalent to the relevant objects.
439 * <p>
440 * This method matches the signature of the functional interface {@link TemporalQuery}
441 * allowing it to be used as a query via method reference, {@code LocalDateTime::from}.
442 *
443 * @param temporal the temporal object to convert, not null
444 * @return the local date-time, not null
445 * @throws DateTimeException if unable to convert to a {@code LocalDateTime}
446 */
447 public static LocalDateTime from(TemporalAccessor temporal) {
448 if (temporal instanceof LocalDateTime) {
449 return (LocalDateTime) temporal;
450 } else if (temporal instanceof ZonedDateTime) {
451 return ((ZonedDateTime) temporal).toLocalDateTime();
452 } else if (temporal instanceof OffsetDateTime) {
453 return ((OffsetDateTime) temporal).toLocalDateTime();
454 }
455 try {
456 LocalDate date = LocalDate.from(temporal);
457 LocalTime time = LocalTime.from(temporal);
458 return new LocalDateTime(date, time);
459 } catch (DateTimeException ex) {
460 throw new DateTimeException("Unable to obtain LocalDateTime from TemporalAccessor: " +
461 temporal + " of type " + temporal.getClass().getName(), ex);
462 }
463 }
464
465 //-----------------------------------------------------------------------
466 /**
467 * Obtains an instance of {@code LocalDateTime} from a text string such as {@code 2007-12-03T10:15:30}.
468 * <p>
469 * The string must represent a valid date-time and is parsed using
470 * {@link java.time.format.DateTimeFormatter#ISO_LOCAL_DATE_TIME}.
471 *
472 * @param text the text to parse such as "2007-12-03T10:15:30", not null
473 * @return the parsed local date-time, not null
474 * @throws DateTimeParseException if the text cannot be parsed
475 */
476 public static LocalDateTime parse(CharSequence text) {
477 return parse(text, DateTimeFormatter.ISO_LOCAL_DATE_TIME);
478 }
479
480 /**
481 * Obtains an instance of {@code LocalDateTime} from a text string using a specific formatter.
482 * <p>
483 * The text is parsed using the formatter, returning a date-time.
484 *
485 * @param text the text to parse, not null
486 * @param formatter the formatter to use, not null
487 * @return the parsed local date-time, not null
488 * @throws DateTimeParseException if the text cannot be parsed
489 */
490 public static LocalDateTime parse(CharSequence text, DateTimeFormatter formatter) {
491 Objects.requireNonNull(formatter, "formatter");
492 return formatter.parse(text, LocalDateTime::from);
493 }
494
495 //-----------------------------------------------------------------------
496 /**
497 * Constructor.
498 *
499 * @param date the date part of the date-time, validated not null
500 * @param time the time part of the date-time, validated not null
501 */
502 private LocalDateTime(LocalDate date, LocalTime time) {
503 this.date = date;
504 this.time = time;
505 }
506
507 /**
508 * Returns a copy of this date-time with the new date and time, checking
509 * to see if a new object is in fact required.
510 *
511 * @param newDate the date of the new date-time, not null
512 * @param newTime the time of the new date-time, not null
513 * @return the date-time, not null
514 */
515 private LocalDateTime with(LocalDate newDate, LocalTime newTime) {
516 if (date == newDate && time == newTime) {
517 return this;
518 }
519 return new LocalDateTime(newDate, newTime);
520 }
521
522 //-----------------------------------------------------------------------
523 /**
524 * Checks if the specified field is supported.
525 * <p>
526 * This checks if this date-time can be queried for the specified field.
527 * If false, then calling the {@link #range(TemporalField) range},
528 * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
529 * methods will throw an exception.
530 * <p>
531 * If the field is a {@link ChronoField} then the query is implemented here.
532 * The supported fields are:
533 * <ul>
534 * <li>{@code NANO_OF_SECOND}
535 * <li>{@code NANO_OF_DAY}
536 * <li>{@code MICRO_OF_SECOND}
537 * <li>{@code MICRO_OF_DAY}
538 * <li>{@code MILLI_OF_SECOND}
539 * <li>{@code MILLI_OF_DAY}
540 * <li>{@code SECOND_OF_MINUTE}
541 * <li>{@code SECOND_OF_DAY}
542 * <li>{@code MINUTE_OF_HOUR}
543 * <li>{@code MINUTE_OF_DAY}
544 * <li>{@code HOUR_OF_AMPM}
545 * <li>{@code CLOCK_HOUR_OF_AMPM}
546 * <li>{@code HOUR_OF_DAY}
547 * <li>{@code CLOCK_HOUR_OF_DAY}
548 * <li>{@code AMPM_OF_DAY}
549 * <li>{@code DAY_OF_WEEK}
550 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
551 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
552 * <li>{@code DAY_OF_MONTH}
553 * <li>{@code DAY_OF_YEAR}
554 * <li>{@code EPOCH_DAY}
555 * <li>{@code ALIGNED_WEEK_OF_MONTH}
556 * <li>{@code ALIGNED_WEEK_OF_YEAR}
557 * <li>{@code MONTH_OF_YEAR}
558 * <li>{@code PROLEPTIC_MONTH}
559 * <li>{@code YEAR_OF_ERA}
560 * <li>{@code YEAR}
561 * <li>{@code ERA}
562 * </ul>
563 * All other {@code ChronoField} instances will return false.
564 * <p>
565 * If the field is not a {@code ChronoField}, then the result of this method
566 * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
567 * passing {@code this} as the argument.
568 * Whether the field is supported is determined by the field.
569 *
570 * @param field the field to check, null returns false
571 * @return true if the field is supported on this date-time, false if not
572 */
573 @Override
574 public boolean isSupported(TemporalField field) {
575 if (field instanceof ChronoField) {
576 ChronoField f = (ChronoField) field;
577 return f.isDateBased() || f.isTimeBased();
578 }
579 return field != null && field.isSupportedBy(this);
580 }
581
582 /**
583 * Checks if the specified unit is supported.
584 * <p>
585 * This checks if the specified unit can be added to, or subtracted from, this date-time.
586 * If false, then calling the {@link #plus(long, TemporalUnit)} and
587 * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
588 * <p>
589 * If the unit is a {@link ChronoUnit} then the query is implemented here.
590 * The supported units are:
591 * <ul>
592 * <li>{@code NANOS}
593 * <li>{@code MICROS}
594 * <li>{@code MILLIS}
595 * <li>{@code SECONDS}
596 * <li>{@code MINUTES}
597 * <li>{@code HOURS}
598 * <li>{@code HALF_DAYS}
599 * <li>{@code DAYS}
600 * <li>{@code WEEKS}
601 * <li>{@code MONTHS}
602 * <li>{@code YEARS}
603 * <li>{@code DECADES}
604 * <li>{@code CENTURIES}
605 * <li>{@code MILLENNIA}
606 * <li>{@code ERAS}
607 * </ul>
608 * All other {@code ChronoUnit} instances will return false.
609 * <p>
610 * If the unit is not a {@code ChronoUnit}, then the result of this method
611 * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
612 * passing {@code this} as the argument.
613 * Whether the unit is supported is determined by the unit.
614 *
615 * @param unit the unit to check, null returns false
616 * @return true if the unit can be added/subtracted, false if not
617 */
618 @Override // override for Javadoc
619 public boolean isSupported(TemporalUnit unit) {
620 return ChronoLocalDateTime.super.isSupported(unit);
621 }
622
623 //-----------------------------------------------------------------------
624 /**
625 * Gets the range of valid values for the specified field.
626 * <p>
627 * The range object expresses the minimum and maximum valid values for a field.
628 * This date-time is used to enhance the accuracy of the returned range.
629 * If it is not possible to return the range, because the field is not supported
630 * or for some other reason, an exception is thrown.
631 * <p>
632 * If the field is a {@link ChronoField} then the query is implemented here.
633 * The {@link #isSupported(TemporalField) supported fields} will return
634 * appropriate range instances.
635 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
636 * <p>
637 * If the field is not a {@code ChronoField}, then the result of this method
638 * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
639 * passing {@code this} as the argument.
640 * Whether the range can be obtained is determined by the field.
641 *
642 * @param field the field to query the range for, not null
643 * @return the range of valid values for the field, not null
644 * @throws DateTimeException if the range for the field cannot be obtained
645 * @throws UnsupportedTemporalTypeException if the field is not supported
646 */
647 @Override
648 public ValueRange range(TemporalField field) {
649 if (field instanceof ChronoField) {
650 ChronoField f = (ChronoField) field;
651 return (f.isTimeBased() ? time.range(field) : date.range(field));
652 }
653 return field.rangeRefinedBy(this);
654 }
655
656 /**
657 * Gets the value of the specified field from this date-time as an {@code int}.
658 * <p>
659 * This queries this date-time for the value of the specified field.
660 * The returned value will always be within the valid range of values for the field.
661 * If it is not possible to return the value, because the field is not supported
662 * or for some other reason, an exception is thrown.
663 * <p>
664 * If the field is a {@link ChronoField} then the query is implemented here.
665 * The {@link #isSupported(TemporalField) supported fields} will return valid
666 * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
667 * {@code EPOCH_DAY} and {@code PROLEPTIC_MONTH} which are too large to fit in
668 * an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
669 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
670 * <p>
671 * If the field is not a {@code ChronoField}, then the result of this method
672 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
673 * passing {@code this} as the argument. Whether the value can be obtained,
674 * and what the value represents, is determined by the field.
675 *
676 * @param field the field to get, not null
677 * @return the value for the field
678 * @throws DateTimeException if a value for the field cannot be obtained or
679 * the value is outside the range of valid values for the field
680 * @throws UnsupportedTemporalTypeException if the field is not supported or
681 * the range of values exceeds an {@code int}
682 * @throws ArithmeticException if numeric overflow occurs
683 */
684 @Override
685 public int get(TemporalField field) {
686 if (field instanceof ChronoField) {
687 ChronoField f = (ChronoField) field;
688 return (f.isTimeBased() ? time.get(field) : date.get(field));
689 }
690 return ChronoLocalDateTime.super.get(field);
691 }
692
693 /**
694 * Gets the value of the specified field from this date-time as a {@code long}.
695 * <p>
696 * This queries this date-time for the value of the specified field.
697 * If it is not possible to return the value, because the field is not supported
698 * or for some other reason, an exception is thrown.
699 * <p>
700 * If the field is a {@link ChronoField} then the query is implemented here.
701 * The {@link #isSupported(TemporalField) supported fields} will return valid
702 * values based on this date-time.
703 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
704 * <p>
705 * If the field is not a {@code ChronoField}, then the result of this method
706 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
707 * passing {@code this} as the argument. Whether the value can be obtained,
708 * and what the value represents, is determined by the field.
709 *
710 * @param field the field to get, not null
711 * @return the value for the field
712 * @throws DateTimeException if a value for the field cannot be obtained
713 * @throws UnsupportedTemporalTypeException if the field is not supported
714 * @throws ArithmeticException if numeric overflow occurs
715 */
716 @Override
717 public long getLong(TemporalField field) {
718 if (field instanceof ChronoField) {
719 ChronoField f = (ChronoField) field;
720 return (f.isTimeBased() ? time.getLong(field) : date.getLong(field));
721 }
722 return field.getFrom(this);
723 }
724
725 //-----------------------------------------------------------------------
726 /**
727 * Gets the {@code LocalDate} part of this date-time.
728 * <p>
729 * This returns a {@code LocalDate} with the same year, month and day
730 * as this date-time.
731 *
732 * @return the date part of this date-time, not null
733 */
734 @Override
735 public LocalDate toLocalDate() {
736 return date;
737 }
738
739 /**
740 * Gets the year field.
741 * <p>
742 * This method returns the primitive {@code int} value for the year.
743 * <p>
744 * The year returned by this method is proleptic as per {@code get(YEAR)}.
745 * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
746 *
747 * @return the year, from MIN_YEAR to MAX_YEAR
748 */
749 public int getYear() {
750 return date.getYear();
751 }
752
753 /**
754 * Gets the month-of-year field from 1 to 12.
755 * <p>
756 * This method returns the month as an {@code int} from 1 to 12.
757 * Application code is frequently clearer if the enum {@link Month}
758 * is used by calling {@link #getMonth()}.
759 *
760 * @return the month-of-year, from 1 to 12
761 * @see #getMonth()
762 */
763 public int getMonthValue() {
764 return date.getMonthValue();
765 }
766
767 /**
768 * Gets the month-of-year field using the {@code Month} enum.
769 * <p>
770 * This method returns the enum {@link Month} for the month.
771 * This avoids confusion as to what {@code int} values mean.
772 * If you need access to the primitive {@code int} value then the enum
773 * provides the {@link Month#getValue() int value}.
774 *
775 * @return the month-of-year, not null
776 * @see #getMonthValue()
777 */
778 public Month getMonth() {
779 return date.getMonth();
780 }
781
782 /**
783 * Gets the day-of-month field.
784 * <p>
785 * This method returns the primitive {@code int} value for the day-of-month.
786 *
787 * @return the day-of-month, from 1 to 31
788 */
789 public int getDayOfMonth() {
790 return date.getDayOfMonth();
791 }
792
793 /**
794 * Gets the day-of-year field.
795 * <p>
796 * This method returns the primitive {@code int} value for the day-of-year.
797 *
798 * @return the day-of-year, from 1 to 365, or 366 in a leap year
799 */
800 public int getDayOfYear() {
801 return date.getDayOfYear();
802 }
803
804 /**
805 * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
806 * <p>
807 * This method returns the enum {@link DayOfWeek} for the day-of-week.
808 * This avoids confusion as to what {@code int} values mean.
809 * If you need access to the primitive {@code int} value then the enum
810 * provides the {@link DayOfWeek#getValue() int value}.
811 * <p>
812 * Additional information can be obtained from the {@code DayOfWeek}.
813 * This includes textual names of the values.
814 *
815 * @return the day-of-week, not null
816 */
817 public DayOfWeek getDayOfWeek() {
818 return date.getDayOfWeek();
819 }
820
821 //-----------------------------------------------------------------------
822 /**
823 * Gets the {@code LocalTime} part of this date-time.
824 * <p>
825 * This returns a {@code LocalTime} with the same hour, minute, second and
826 * nanosecond as this date-time.
827 *
828 * @return the time part of this date-time, not null
829 */
830 @Override
831 public LocalTime toLocalTime() {
832 return time;
833 }
834
835 /**
836 * Gets the hour-of-day field.
837 *
838 * @return the hour-of-day, from 0 to 23
839 */
840 public int getHour() {
841 return time.getHour();
842 }
843
844 /**
845 * Gets the minute-of-hour field.
846 *
847 * @return the minute-of-hour, from 0 to 59
848 */
849 public int getMinute() {
850 return time.getMinute();
851 }
852
853 /**
854 * Gets the second-of-minute field.
855 *
856 * @return the second-of-minute, from 0 to 59
857 */
858 public int getSecond() {
859 return time.getSecond();
860 }
861
862 /**
863 * Gets the nano-of-second field.
864 *
865 * @return the nano-of-second, from 0 to 999,999,999
866 */
867 public int getNano() {
868 return time.getNano();
869 }
870
871 //-----------------------------------------------------------------------
872 /**
873 * Returns an adjusted copy of this date-time.
874 * <p>
875 * This returns a {@code LocalDateTime}, based on this one, with the date-time adjusted.
876 * The adjustment takes place using the specified adjuster strategy object.
877 * Read the documentation of the adjuster to understand what adjustment will be made.
878 * <p>
879 * A simple adjuster might simply set the one of the fields, such as the year field.
880 * A more complex adjuster might set the date to the last day of the month.
881 * <p>
882 * A selection of common adjustments is provided in
883 * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
884 * These include finding the "last day of the month" and "next Wednesday".
885 * Key date-time classes also implement the {@code TemporalAdjuster} interface,
886 * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
887 * The adjuster is responsible for handling special cases, such as the varying
888 * lengths of month and leap years.
889 * <p>
890 * For example this code returns a date on the last day of July:
891 * <pre>
892 * import static java.time.Month.*;
893 * import static java.time.temporal.TemporalAdjusters.*;
894 *
895 * result = localDateTime.with(JULY).with(lastDayOfMonth());
896 * </pre>
897 * <p>
898 * The classes {@link LocalDate} and {@link LocalTime} implement {@code TemporalAdjuster},
899 * thus this method can be used to change the date, time or offset:
900 * <pre>
901 * result = localDateTime.with(date);
902 * result = localDateTime.with(time);
903 * </pre>
904 * <p>
905 * The result of this method is obtained by invoking the
906 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
907 * specified adjuster passing {@code this} as the argument.
908 * <p>
909 * This instance is immutable and unaffected by this method call.
910 *
911 * @param adjuster the adjuster to use, not null
912 * @return a {@code LocalDateTime} based on {@code this} with the adjustment made, not null
913 * @throws DateTimeException if the adjustment cannot be made
914 * @throws ArithmeticException if numeric overflow occurs
915 */
916 @Override
917 public LocalDateTime with(TemporalAdjuster adjuster) {
918 // optimizations
919 if (adjuster instanceof LocalDate) {
920 return with((LocalDate) adjuster, time);
921 } else if (adjuster instanceof LocalTime) {
922 return with(date, (LocalTime) adjuster);
923 } else if (adjuster instanceof LocalDateTime) {
924 return (LocalDateTime) adjuster;
925 }
926 return (LocalDateTime) adjuster.adjustInto(this);
927 }
928
929 /**
930 * Returns a copy of this date-time with the specified field set to a new value.
931 * <p>
932 * This returns a {@code LocalDateTime}, based on this one, with the value
933 * for the specified field changed.
934 * This can be used to change any supported field, such as the year, month or day-of-month.
935 * If it is not possible to set the value, because the field is not supported or for
936 * some other reason, an exception is thrown.
937 * <p>
938 * In some cases, changing the specified field can cause the resulting date-time to become invalid,
939 * such as changing the month from 31st January to February would make the day-of-month invalid.
940 * In cases like this, the field is responsible for resolving the date. Typically it will choose
941 * the previous valid date, which would be the last valid day of February in this example.
942 * <p>
943 * If the field is a {@link ChronoField} then the adjustment is implemented here.
944 * The {@link #isSupported(TemporalField) supported fields} will behave as per
945 * the matching method on {@link LocalDate#with(TemporalField, long) LocalDate}
946 * or {@link LocalTime#with(TemporalField, long) LocalTime}.
947 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
948 * <p>
949 * If the field is not a {@code ChronoField}, then the result of this method
950 * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
951 * passing {@code this} as the argument. In this case, the field determines
952 * whether and how to adjust the instant.
953 * <p>
954 * This instance is immutable and unaffected by this method call.
955 *
956 * @param field the field to set in the result, not null
957 * @param newValue the new value of the field in the result
958 * @return a {@code LocalDateTime} based on {@code this} with the specified field set, not null
959 * @throws DateTimeException if the field cannot be set
960 * @throws UnsupportedTemporalTypeException if the field is not supported
961 * @throws ArithmeticException if numeric overflow occurs
962 */
963 @Override
964 public LocalDateTime with(TemporalField field, long newValue) {
965 if (field instanceof ChronoField) {
966 ChronoField f = (ChronoField) field;
967 if (f.isTimeBased()) {
968 return with(date, time.with(field, newValue));
969 } else {
970 return with(date.with(field, newValue), time);
971 }
972 }
973 return field.adjustInto(this, newValue);
974 }
975
976 //-----------------------------------------------------------------------
977 /**
978 * Returns a copy of this {@code LocalDateTime} with the year altered.
979 * <p>
980 * The time does not affect the calculation and will be the same in the result.
981 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
982 * <p>
983 * This instance is immutable and unaffected by this method call.
984 *
985 * @param year the year to set in the result, from MIN_YEAR to MAX_YEAR
986 * @return a {@code LocalDateTime} based on this date-time with the requested year, not null
987 * @throws DateTimeException if the year value is invalid
988 */
989 public LocalDateTime withYear(int year) {
990 return with(date.withYear(year), time);
991 }
992
993 /**
994 * Returns a copy of this {@code LocalDateTime} with the month-of-year altered.
995 * <p>
996 * The time does not affect the calculation and will be the same in the result.
997 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
998 * <p>
999 * This instance is immutable and unaffected by this method call.
1000 *
1001 * @param month the month-of-year to set in the result, from 1 (January) to 12 (December)
1002 * @return a {@code LocalDateTime} based on this date-time with the requested month, not null
1003 * @throws DateTimeException if the month-of-year value is invalid
1004 */
1005 public LocalDateTime withMonth(int month) {
1006 return with(date.withMonth(month), time);
1007 }
1008
1009 /**
1010 * Returns a copy of this {@code LocalDateTime} with the day-of-month altered.
1011 * <p>
1012 * If the resulting date-time is invalid, an exception is thrown.
1013 * The time does not affect the calculation and will be the same in the result.
1014 * <p>
1015 * This instance is immutable and unaffected by this method call.
1016 *
1017 * @param dayOfMonth the day-of-month to set in the result, from 1 to 28-31
1018 * @return a {@code LocalDateTime} based on this date-time with the requested day, not null
1019 * @throws DateTimeException if the day-of-month value is invalid,
1020 * or if the day-of-month is invalid for the month-year
1021 */
1022 public LocalDateTime withDayOfMonth(int dayOfMonth) {
1023 return with(date.withDayOfMonth(dayOfMonth), time);
1024 }
1025
1026 /**
1027 * Returns a copy of this {@code LocalDateTime} with the day-of-year altered.
1028 * <p>
1029 * If the resulting date-time is invalid, an exception is thrown.
1030 * <p>
1031 * This instance is immutable and unaffected by this method call.
1032 *
1033 * @param dayOfYear the day-of-year to set in the result, from 1 to 365-366
1034 * @return a {@code LocalDateTime} based on this date with the requested day, not null
1035 * @throws DateTimeException if the day-of-year value is invalid,
1036 * or if the day-of-year is invalid for the year
1037 */
1038 public LocalDateTime withDayOfYear(int dayOfYear) {
1039 return with(date.withDayOfYear(dayOfYear), time);
1040 }
1041
1042 //-----------------------------------------------------------------------
1043 /**
1044 * Returns a copy of this {@code LocalDateTime} with the hour-of-day altered.
1045 * <p>
1046 * This instance is immutable and unaffected by this method call.
1047 *
1048 * @param hour the hour-of-day to set in the result, from 0 to 23
1049 * @return a {@code LocalDateTime} based on this date-time with the requested hour, not null
1050 * @throws DateTimeException if the hour value is invalid
1051 */
1052 public LocalDateTime withHour(int hour) {
1053 LocalTime newTime = time.withHour(hour);
1054 return with(date, newTime);
1055 }
1056
1057 /**
1058 * Returns a copy of this {@code LocalDateTime} with the minute-of-hour altered.
1059 * <p>
1060 * This instance is immutable and unaffected by this method call.
1061 *
1062 * @param minute the minute-of-hour to set in the result, from 0 to 59
1063 * @return a {@code LocalDateTime} based on this date-time with the requested minute, not null
1064 * @throws DateTimeException if the minute value is invalid
1065 */
1066 public LocalDateTime withMinute(int minute) {
1067 LocalTime newTime = time.withMinute(minute);
1068 return with(date, newTime);
1069 }
1070
1071 /**
1072 * Returns a copy of this {@code LocalDateTime} with the second-of-minute altered.
1073 * <p>
1074 * This instance is immutable and unaffected by this method call.
1075 *
1076 * @param second the second-of-minute to set in the result, from 0 to 59
1077 * @return a {@code LocalDateTime} based on this date-time with the requested second, not null
1078 * @throws DateTimeException if the second value is invalid
1079 */
1080 public LocalDateTime withSecond(int second) {
1081 LocalTime newTime = time.withSecond(second);
1082 return with(date, newTime);
1083 }
1084
1085 /**
1086 * Returns a copy of this {@code LocalDateTime} with the nano-of-second altered.
1087 * <p>
1088 * This instance is immutable and unaffected by this method call.
1089 *
1090 * @param nanoOfSecond the nano-of-second to set in the result, from 0 to 999,999,999
1091 * @return a {@code LocalDateTime} based on this date-time with the requested nanosecond, not null
1092 * @throws DateTimeException if the nano value is invalid
1093 */
1094 public LocalDateTime withNano(int nanoOfSecond) {
1095 LocalTime newTime = time.withNano(nanoOfSecond);
1096 return with(date, newTime);
1097 }
1098
1099 //-----------------------------------------------------------------------
1100 /**
1101 * Returns a copy of this {@code LocalDateTime} with the time truncated.
1102 * <p>
1103 * Truncation returns a copy of the original date-time with fields
1104 * smaller than the specified unit set to zero.
1105 * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1106 * will set the second-of-minute and nano-of-second field to zero.
1107 * <p>
1108 * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
1109 * that divides into the length of a standard day without remainder.
1110 * This includes all supplied time units on {@link ChronoUnit} and
1111 * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
1112 * <p>
1113 * This instance is immutable and unaffected by this method call.
1114 *
1115 * @param unit the unit to truncate to, not null
1116 * @return a {@code LocalDateTime} based on this date-time with the time truncated, not null
1117 * @throws DateTimeException if unable to truncate
1118 * @throws UnsupportedTemporalTypeException if the unit is not supported
1119 */
1120 public LocalDateTime truncatedTo(TemporalUnit unit) {
1121 return with(date, time.truncatedTo(unit));
1122 }
1123
1124 //-----------------------------------------------------------------------
1125 /**
1126 * Returns a copy of this date-time with the specified amount added.
1127 * <p>
1128 * This returns a {@code LocalDateTime}, based on this one, with the specified amount added.
1129 * The amount is typically {@link Period} or {@link Duration} but may be
1130 * any other type implementing the {@link TemporalAmount} interface.
1131 * <p>
1132 * The calculation is delegated to the amount object by calling
1133 * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
1134 * to implement the addition in any way it wishes, however it typically
1135 * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
1136 * of the amount implementation to determine if it can be successfully added.
1137 * <p>
1138 * This instance is immutable and unaffected by this method call.
1139 *
1140 * @param amountToAdd the amount to add, not null
1141 * @return a {@code LocalDateTime} based on this date-time with the addition made, not null
1142 * @throws DateTimeException if the addition cannot be made
1143 * @throws ArithmeticException if numeric overflow occurs
1144 */
1145 @Override
1146 public LocalDateTime plus(TemporalAmount amountToAdd) {
1147 if (amountToAdd instanceof Period) {
1148 Period periodToAdd = (Period) amountToAdd;
1149 return with(date.plus(periodToAdd), time);
1150 }
1151 Objects.requireNonNull(amountToAdd, "amountToAdd");
1152 return (LocalDateTime) amountToAdd.addTo(this);
1153 }
1154
1155 /**
1156 * Returns a copy of this date-time with the specified amount added.
1157 * <p>
1158 * This returns a {@code LocalDateTime}, based on this one, with the amount
1159 * in terms of the unit added. If it is not possible to add the amount, because the
1160 * unit is not supported or for some other reason, an exception is thrown.
1161 * <p>
1162 * If the field is a {@link ChronoUnit} then the addition is implemented here.
1163 * Date units are added as per {@link LocalDate#plus(long, TemporalUnit)}.
1164 * Time units are added as per {@link LocalTime#plus(long, TemporalUnit)} with
1165 * any overflow in days added equivalent to using {@link #plusDays(long)}.
1166 * <p>
1167 * If the field is not a {@code ChronoUnit}, then the result of this method
1168 * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
1169 * passing {@code this} as the argument. In this case, the unit determines
1170 * whether and how to perform the addition.
1171 * <p>
1172 * This instance is immutable and unaffected by this method call.
1173 *
1174 * @param amountToAdd the amount of the unit to add to the result, may be negative
1175 * @param unit the unit of the amount to add, not null
1176 * @return a {@code LocalDateTime} based on this date-time with the specified amount added, not null
1177 * @throws DateTimeException if the addition cannot be made
1178 * @throws UnsupportedTemporalTypeException if the unit is not supported
1179 * @throws ArithmeticException if numeric overflow occurs
1180 */
1181 @Override
1182 public LocalDateTime plus(long amountToAdd, TemporalUnit unit) {
1183 if (unit instanceof ChronoUnit) {
1184 ChronoUnit f = (ChronoUnit) unit;
1185 switch (f) {
1186 case NANOS: return plusNanos(amountToAdd);
1187 case MICROS: return plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);
1188 case MILLIS: return plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);
1189 case SECONDS: return plusSeconds(amountToAdd);
1190 case MINUTES: return plusMinutes(amountToAdd);
1191 case HOURS: return plusHours(amountToAdd);
1192 case HALF_DAYS: return plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12); // no overflow (256 is multiple of 2)
1193 }
1194 return with(date.plus(amountToAdd, unit), time);
1195 }
1196 return unit.addTo(this, amountToAdd);
1197 }
1198
1199 //-----------------------------------------------------------------------
1200 /**
1201 * Returns a copy of this {@code LocalDateTime} with the specified number of years added.
1202 * <p>
1203 * This method adds the specified amount to the years field in three steps:
1204 * <ol>
1205 * <li>Add the input years to the year field</li>
1206 * <li>Check if the resulting date would be invalid</li>
1207 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1208 * </ol>
1209 * <p>
1210 * For example, 2008-02-29 (leap year) plus one year would result in the
1211 * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1212 * result, the last valid day of the month, 2009-02-28, is selected instead.
1213 * <p>
1214 * This instance is immutable and unaffected by this method call.
1215 *
1216 * @param years the years to add, may be negative
1217 * @return a {@code LocalDateTime} based on this date-time with the years added, not null
1218 * @throws DateTimeException if the result exceeds the supported date range
1219 */
1220 public LocalDateTime plusYears(long years) {
1221 LocalDate newDate = date.plusYears(years);
1222 return with(newDate, time);
1223 }
1224
1225 /**
1226 * Returns a copy of this {@code LocalDateTime} with the specified number of months added.
1227 * <p>
1228 * This method adds the specified amount to the months field in three steps:
1229 * <ol>
1230 * <li>Add the input months to the month-of-year field</li>
1231 * <li>Check if the resulting date would be invalid</li>
1232 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1233 * </ol>
1234 * <p>
1235 * For example, 2007-03-31 plus one month would result in the invalid date
1236 * 2007-04-31. Instead of returning an invalid result, the last valid day
1237 * of the month, 2007-04-30, is selected instead.
1238 * <p>
1239 * This instance is immutable and unaffected by this method call.
1240 *
1241 * @param months the months to add, may be negative
1242 * @return a {@code LocalDateTime} based on this date-time with the months added, not null
1243 * @throws DateTimeException if the result exceeds the supported date range
1244 */
1245 public LocalDateTime plusMonths(long months) {
1246 LocalDate newDate = date.plusMonths(months);
1247 return with(newDate, time);
1248 }
1249
1250 /**
1251 * Returns a copy of this {@code LocalDateTime} with the specified number of weeks added.
1252 * <p>
1253 * This method adds the specified amount in weeks to the days field incrementing
1254 * the month and year fields as necessary to ensure the result remains valid.
1255 * The result is only invalid if the maximum/minimum year is exceeded.
1256 * <p>
1257 * For example, 2008-12-31 plus one week would result in 2009-01-07.
1258 * <p>
1259 * This instance is immutable and unaffected by this method call.
1260 *
1261 * @param weeks the weeks to add, may be negative
1262 * @return a {@code LocalDateTime} based on this date-time with the weeks added, not null
1263 * @throws DateTimeException if the result exceeds the supported date range
1264 */
1265 public LocalDateTime plusWeeks(long weeks) {
1266 LocalDate newDate = date.plusWeeks(weeks);
1267 return with(newDate, time);
1268 }
1269
1270 /**
1271 * Returns a copy of this {@code LocalDateTime} with the specified number of days added.
1272 * <p>
1273 * This method adds the specified amount to the days field incrementing the
1274 * month and year fields as necessary to ensure the result remains valid.
1275 * The result is only invalid if the maximum/minimum year is exceeded.
1276 * <p>
1277 * For example, 2008-12-31 plus one day would result in 2009-01-01.
1278 * <p>
1279 * This instance is immutable and unaffected by this method call.
1280 *
1281 * @param days the days to add, may be negative
1282 * @return a {@code LocalDateTime} based on this date-time with the days added, not null
1283 * @throws DateTimeException if the result exceeds the supported date range
1284 */
1285 public LocalDateTime plusDays(long days) {
1286 LocalDate newDate = date.plusDays(days);
1287 return with(newDate, time);
1288 }
1289
1290 //-----------------------------------------------------------------------
1291 /**
1292 * Returns a copy of this {@code LocalDateTime} with the specified number of hours added.
1293 * <p>
1294 * This instance is immutable and unaffected by this method call.
1295 *
1296 * @param hours the hours to add, may be negative
1297 * @return a {@code LocalDateTime} based on this date-time with the hours added, not null
1298 * @throws DateTimeException if the result exceeds the supported date range
1299 */
1300 public LocalDateTime plusHours(long hours) {
1301 return plusWithOverflow(date, hours, 0, 0, 0, 1);
1302 }
1303
1304 /**
1305 * Returns a copy of this {@code LocalDateTime} with the specified number of minutes added.
1306 * <p>
1307 * This instance is immutable and unaffected by this method call.
1308 *
1309 * @param minutes the minutes to add, may be negative
1310 * @return a {@code LocalDateTime} based on this date-time with the minutes added, not null
1311 * @throws DateTimeException if the result exceeds the supported date range
1312 */
1313 public LocalDateTime plusMinutes(long minutes) {
1314 return plusWithOverflow(date, 0, minutes, 0, 0, 1);
1315 }
1316
1317 /**
1318 * Returns a copy of this {@code LocalDateTime} with the specified number of seconds added.
1319 * <p>
1320 * This instance is immutable and unaffected by this method call.
1321 *
1322 * @param seconds the seconds to add, may be negative
1323 * @return a {@code LocalDateTime} based on this date-time with the seconds added, not null
1324 * @throws DateTimeException if the result exceeds the supported date range
1325 */
1326 public LocalDateTime plusSeconds(long seconds) {
1327 return plusWithOverflow(date, 0, 0, seconds, 0, 1);
1328 }
1329
1330 /**
1331 * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds added.
1332 * <p>
1333 * This instance is immutable and unaffected by this method call.
1334 *
1335 * @param nanos the nanos to add, may be negative
1336 * @return a {@code LocalDateTime} based on this date-time with the nanoseconds added, not null
1337 * @throws DateTimeException if the result exceeds the supported date range
1338 */
1339 public LocalDateTime plusNanos(long nanos) {
1340 return plusWithOverflow(date, 0, 0, 0, nanos, 1);
1341 }
1342
1343 //-----------------------------------------------------------------------
1344 /**
1345 * Returns a copy of this date-time with the specified amount subtracted.
1346 * <p>
1347 * This returns a {@code LocalDateTime}, based on this one, with the specified amount subtracted.
1348 * The amount is typically {@link Period} or {@link Duration} but may be
1349 * any other type implementing the {@link TemporalAmount} interface.
1350 * <p>
1351 * The calculation is delegated to the amount object by calling
1352 * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
1353 * to implement the subtraction in any way it wishes, however it typically
1354 * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
1355 * of the amount implementation to determine if it can be successfully subtracted.
1356 * <p>
1357 * This instance is immutable and unaffected by this method call.
1358 *
1359 * @param amountToSubtract the amount to subtract, not null
1360 * @return a {@code LocalDateTime} based on this date-time with the subtraction made, not null
1361 * @throws DateTimeException if the subtraction cannot be made
1362 * @throws ArithmeticException if numeric overflow occurs
1363 */
1364 @Override
1365 public LocalDateTime minus(TemporalAmount amountToSubtract) {
1366 if (amountToSubtract instanceof Period) {
1367 Period periodToSubtract = (Period) amountToSubtract;
1368 return with(date.minus(periodToSubtract), time);
1369 }
1370 Objects.requireNonNull(amountToSubtract, "amountToSubtract");
1371 return (LocalDateTime) amountToSubtract.subtractFrom(this);
1372 }
1373
1374 /**
1375 * Returns a copy of this date-time with the specified amount subtracted.
1376 * <p>
1377 * This returns a {@code LocalDateTime}, based on this one, with the amount
1378 * in terms of the unit subtracted. If it is not possible to subtract the amount,
1379 * because the unit is not supported or for some other reason, an exception is thrown.
1380 * <p>
1381 * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
1382 * See that method for a full description of how addition, and thus subtraction, works.
1383 * <p>
1384 * This instance is immutable and unaffected by this method call.
1385 *
1386 * @param amountToSubtract the amount of the unit to subtract from the result, may be negative
1387 * @param unit the unit of the amount to subtract, not null
1388 * @return a {@code LocalDateTime} based on this date-time with the specified amount subtracted, not null
1389 * @throws DateTimeException if the subtraction cannot be made
1390 * @throws UnsupportedTemporalTypeException if the unit is not supported
1391 * @throws ArithmeticException if numeric overflow occurs
1392 */
1393 @Override
1394 public LocalDateTime minus(long amountToSubtract, TemporalUnit unit) {
1395 return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1396 }
1397
1398 //-----------------------------------------------------------------------
1399 /**
1400 * Returns a copy of this {@code LocalDateTime} with the specified number of years subtracted.
1401 * <p>
1402 * This method subtracts the specified amount from the years field in three steps:
1403 * <ol>
1404 * <li>Subtract the input years from the year field</li>
1405 * <li>Check if the resulting date would be invalid</li>
1406 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1407 * </ol>
1408 * <p>
1409 * For example, 2008-02-29 (leap year) minus one year would result in the
1410 * invalid date 2007-02-29 (standard year). Instead of returning an invalid
1411 * result, the last valid day of the month, 2007-02-28, is selected instead.
1412 * <p>
1413 * This instance is immutable and unaffected by this method call.
1414 *
1415 * @param years the years to subtract, may be negative
1416 * @return a {@code LocalDateTime} based on this date-time with the years subtracted, not null
1417 * @throws DateTimeException if the result exceeds the supported date range
1418 */
1419 public LocalDateTime minusYears(long years) {
1420 return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1421 }
1422
1423 /**
1424 * Returns a copy of this {@code LocalDateTime} with the specified number of months subtracted.
1425 * <p>
1426 * This method subtracts the specified amount from the months field in three steps:
1427 * <ol>
1428 * <li>Subtract the input months from the month-of-year field</li>
1429 * <li>Check if the resulting date would be invalid</li>
1430 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1431 * </ol>
1432 * <p>
1433 * For example, 2007-03-31 minus one month would result in the invalid date
1434 * 2007-02-31. Instead of returning an invalid result, the last valid day
1435 * of the month, 2007-02-28, is selected instead.
1436 * <p>
1437 * This instance is immutable and unaffected by this method call.
1438 *
1439 * @param months the months to subtract, may be negative
1440 * @return a {@code LocalDateTime} based on this date-time with the months subtracted, not null
1441 * @throws DateTimeException if the result exceeds the supported date range
1442 */
1443 public LocalDateTime minusMonths(long months) {
1444 return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1445 }
1446
1447 /**
1448 * Returns a copy of this {@code LocalDateTime} with the specified number of weeks subtracted.
1449 * <p>
1450 * This method subtracts the specified amount in weeks from the days field decrementing
1451 * the month and year fields as necessary to ensure the result remains valid.
1452 * The result is only invalid if the maximum/minimum year is exceeded.
1453 * <p>
1454 * For example, 2009-01-07 minus one week would result in 2008-12-31.
1455 * <p>
1456 * This instance is immutable and unaffected by this method call.
1457 *
1458 * @param weeks the weeks to subtract, may be negative
1459 * @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null
1460 * @throws DateTimeException if the result exceeds the supported date range
1461 */
1462 public LocalDateTime minusWeeks(long weeks) {
1463 return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1464 }
1465
1466 /**
1467 * Returns a copy of this {@code LocalDateTime} with the specified number of days subtracted.
1468 * <p>
1469 * This method subtracts the specified amount from the days field decrementing the
1470 * month and year fields as necessary to ensure the result remains valid.
1471 * The result is only invalid if the maximum/minimum year is exceeded.
1472 * <p>
1473 * For example, 2009-01-01 minus one day would result in 2008-12-31.
1474 * <p>
1475 * This instance is immutable and unaffected by this method call.
1476 *
1477 * @param days the days to subtract, may be negative
1478 * @return a {@code LocalDateTime} based on this date-time with the days subtracted, not null
1479 * @throws DateTimeException if the result exceeds the supported date range
1480 */
1481 public LocalDateTime minusDays(long days) {
1482 return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1483 }
1484
1485 //-----------------------------------------------------------------------
1486 /**
1487 * Returns a copy of this {@code LocalDateTime} with the specified number of hours subtracted.
1488 * <p>
1489 * This instance is immutable and unaffected by this method call.
1490 *
1491 * @param hours the hours to subtract, may be negative
1492 * @return a {@code LocalDateTime} based on this date-time with the hours subtracted, not null
1493 * @throws DateTimeException if the result exceeds the supported date range
1494 */
1495 public LocalDateTime minusHours(long hours) {
1496 return plusWithOverflow(date, hours, 0, 0, 0, -1);
1497 }
1498
1499 /**
1500 * Returns a copy of this {@code LocalDateTime} with the specified number of minutes subtracted.
1501 * <p>
1502 * This instance is immutable and unaffected by this method call.
1503 *
1504 * @param minutes the minutes to subtract, may be negative
1505 * @return a {@code LocalDateTime} based on this date-time with the minutes subtracted, not null
1506 * @throws DateTimeException if the result exceeds the supported date range
1507 */
1508 public LocalDateTime minusMinutes(long minutes) {
1509 return plusWithOverflow(date, 0, minutes, 0, 0, -1);
1510 }
1511
1512 /**
1513 * Returns a copy of this {@code LocalDateTime} with the specified number of seconds subtracted.
1514 * <p>
1515 * This instance is immutable and unaffected by this method call.
1516 *
1517 * @param seconds the seconds to subtract, may be negative
1518 * @return a {@code LocalDateTime} based on this date-time with the seconds subtracted, not null
1519 * @throws DateTimeException if the result exceeds the supported date range
1520 */
1521 public LocalDateTime minusSeconds(long seconds) {
1522 return plusWithOverflow(date, 0, 0, seconds, 0, -1);
1523 }
1524
1525 /**
1526 * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds subtracted.
1527 * <p>
1528 * This instance is immutable and unaffected by this method call.
1529 *
1530 * @param nanos the nanos to subtract, may be negative
1531 * @return a {@code LocalDateTime} based on this date-time with the nanoseconds subtracted, not null
1532 * @throws DateTimeException if the result exceeds the supported date range
1533 */
1534 public LocalDateTime minusNanos(long nanos) {
1535 return plusWithOverflow(date, 0, 0, 0, nanos, -1);
1536 }
1537
1538 //-----------------------------------------------------------------------
1539 /**
1540 * Returns a copy of this {@code LocalDateTime} with the specified period added.
1541 * <p>
1542 * This instance is immutable and unaffected by this method call.
1543 *
1544 * @param newDate the new date to base the calculation on, not null
1545 * @param hours the hours to add, may be negative
1546 * @param minutes the minutes to add, may be negative
1547 * @param seconds the seconds to add, may be negative
1548 * @param nanos the nanos to add, may be negative
1549 * @param sign the sign to determine add or subtract
1550 * @return the combined result, not null
1551 */
1552 private LocalDateTime plusWithOverflow(LocalDate newDate, long hours, long minutes, long seconds, long nanos, int sign) {
1553 // 9223372036854775808 long, 2147483648 int
1554 if ((hours | minutes | seconds | nanos) == 0) {
1555 return with(newDate, time);
1556 }
1557 long totDays = nanos / NANOS_PER_DAY + // max/24*60*60*1B
1558 seconds / SECONDS_PER_DAY + // max/24*60*60
1559 minutes / MINUTES_PER_DAY + // max/24*60
1560 hours / HOURS_PER_DAY; // max/24
1561 totDays *= sign; // total max*0.4237...
1562 long totNanos = nanos % NANOS_PER_DAY + // max 86400000000000
1563 (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND + // max 86400000000000
1564 (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE + // max 86400000000000
1565 (hours % HOURS_PER_DAY) * NANOS_PER_HOUR; // max 86400000000000
1566 long curNoD = time.toNanoOfDay(); // max 86400000000000
1567 totNanos = totNanos * sign + curNoD; // total 432000000000000
1568 totDays += Math.floorDiv(totNanos, NANOS_PER_DAY);
1569 long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY);
1570 LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD));
1571 return with(newDate.plusDays(totDays), newTime);
1572 }
1573
1574 //-----------------------------------------------------------------------
1575 /**
1576 * Queries this date-time using the specified query.
1577 * <p>
1578 * This queries this date-time using the specified query strategy object.
1579 * The {@code TemporalQuery} object defines the logic to be used to
1580 * obtain the result. Read the documentation of the query to understand
1581 * what the result of this method will be.
1582 * <p>
1583 * The result of this method is obtained by invoking the
1584 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
1585 * specified query passing {@code this} as the argument.
1586 *
1587 * @param <R> the type of the result
1588 * @param query the query to invoke, not null
1589 * @return the query result, null may be returned (defined by the query)
1590 * @throws DateTimeException if unable to query (defined by the query)
1591 * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1592 */
1593 @SuppressWarnings("unchecked")
1594 @Override // override for Javadoc
1595 public <R> R query(TemporalQuery<R> query) {
1596 if (query == TemporalQueries.localDate()) {
1597 return (R) date;
1598 }
1599 return ChronoLocalDateTime.super.query(query);
1600 }
1601
1602 /**
1603 * Adjusts the specified temporal object to have the same date and time as this object.
1604 * <p>
1605 * This returns a temporal object of the same observable type as the input
1606 * with the date and time changed to be the same as this.
1607 * <p>
1608 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1609 * twice, passing {@link ChronoField#EPOCH_DAY} and
1610 * {@link ChronoField#NANO_OF_DAY} as the fields.
1611 * <p>
1612 * In most cases, it is clearer to reverse the calling pattern by using
1613 * {@link Temporal#with(TemporalAdjuster)}:
1614 * <pre>
1615 * // these two lines are equivalent, but the second approach is recommended
1616 * temporal = thisLocalDateTime.adjustInto(temporal);
1617 * temporal = temporal.with(thisLocalDateTime);
1618 * </pre>
1619 * <p>
1620 * This instance is immutable and unaffected by this method call.
1621 *
1622 * @param temporal the target object to be adjusted, not null
1623 * @return the adjusted object, not null
1624 * @throws DateTimeException if unable to make the adjustment
1625 * @throws ArithmeticException if numeric overflow occurs
1626 */
1627 @Override // override for Javadoc
1628 public Temporal adjustInto(Temporal temporal) {
1629 return ChronoLocalDateTime.super.adjustInto(temporal);
1630 }
1631
1632 /**
1633 * Calculates the amount of time until another date-time in terms of the specified unit.
1634 * <p>
1635 * This calculates the amount of time between two {@code LocalDateTime}
1636 * objects in terms of a single {@code TemporalUnit}.
1637 * The start and end points are {@code this} and the specified date-time.
1638 * The result will be negative if the end is before the start.
1639 * The {@code Temporal} passed to this method is converted to a
1640 * {@code LocalDateTime} using {@link #from(TemporalAccessor)}.
1641 * For example, the amount in days between two date-times can be calculated
1642 * using {@code startDateTime.until(endDateTime, DAYS)}.
1643 * <p>
1644 * The calculation returns a whole number, representing the number of
1645 * complete units between the two date-times.
1646 * For example, the amount in months between 2012-06-15T00:00 and 2012-08-14T23:59
1647 * will only be one month as it is one minute short of two months.
1648 * <p>
1649 * There are two equivalent ways of using this method.
1650 * The first is to invoke this method.
1651 * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
1652 * <pre>
1653 * // these two lines are equivalent
1654 * amount = start.until(end, MONTHS);
1655 * amount = MONTHS.between(start, end);
1656 * </pre>
1657 * The choice should be made based on which makes the code more readable.
1658 * <p>
1659 * The calculation is implemented in this method for {@link ChronoUnit}.
1660 * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1661 * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1662 * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1663 * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1664 * Other {@code ChronoUnit} values will throw an exception.
1665 * <p>
1666 * If the unit is not a {@code ChronoUnit}, then the result of this method
1667 * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1668 * passing {@code this} as the first argument and the converted input temporal
1669 * as the second argument.
1670 * <p>
1671 * This instance is immutable and unaffected by this method call.
1672 *
1673 * @param endExclusive the end date, exclusive, which is converted to a {@code LocalDateTime}, not null
1674 * @param unit the unit to measure the amount in, not null
1675 * @return the amount of time between this date-time and the end date-time
1676 * @throws DateTimeException if the amount cannot be calculated, or the end
1677 * temporal cannot be converted to a {@code LocalDateTime}
1678 * @throws UnsupportedTemporalTypeException if the unit is not supported
1679 * @throws ArithmeticException if numeric overflow occurs
1680 */
1681 @Override
1682 public long until(Temporal endExclusive, TemporalUnit unit) {
1683 LocalDateTime end = LocalDateTime.from(endExclusive);
1684 if (unit instanceof ChronoUnit) {
1685 if (unit.isTimeBased()) {
1686 long amount = date.daysUntil(end.date);
1687 if (amount == 0) {
1688 return time.until(end.time, unit);
1689 }
1690 long timePart = end.time.toNanoOfDay() - time.toNanoOfDay();
1691 if (amount > 0) {
1692 amount--; // safe
1693 timePart += NANOS_PER_DAY; // safe
1694 } else {
1695 amount++; // safe
1696 timePart -= NANOS_PER_DAY; // safe
1697 }
1698 switch ((ChronoUnit) unit) {
1699 case NANOS:
1700 amount = Math.multiplyExact(amount, NANOS_PER_DAY);
1701 break;
1702 case MICROS:
1703 amount = Math.multiplyExact(amount, MICROS_PER_DAY);
1704 timePart = timePart / 1000;
1705 break;
1706 case MILLIS:
1707 amount = Math.multiplyExact(amount, MILLIS_PER_DAY);
1708 timePart = timePart / 1_000_000;
1709 break;
1710 case SECONDS:
1711 amount = Math.multiplyExact(amount, SECONDS_PER_DAY);
1712 timePart = timePart / NANOS_PER_SECOND;
1713 break;
1714 case MINUTES:
1715 amount = Math.multiplyExact(amount, MINUTES_PER_DAY);
1716 timePart = timePart / NANOS_PER_MINUTE;
1717 break;
1718 case HOURS:
1719 amount = Math.multiplyExact(amount, HOURS_PER_DAY);
1720 timePart = timePart / NANOS_PER_HOUR;
1721 break;
1722 case HALF_DAYS:
1723 amount = Math.multiplyExact(amount, 2);
1724 timePart = timePart / (NANOS_PER_HOUR * 12);
1725 break;
1726 }
1727 return Math.addExact(amount, timePart);
1728 }
1729 LocalDate endDate = end.date;
1730 if (endDate.isAfter(date) && end.time.isBefore(time)) {
1731 endDate = endDate.minusDays(1);
1732 } else if (endDate.isBefore(date) && end.time.isAfter(time)) {
1733 endDate = endDate.plusDays(1);
1734 }
1735 return date.until(endDate, unit);
1736 }
1737 return unit.between(this, end);
1738 }
1739
1740 /**
1741 * Formats this date-time using the specified formatter.
1742 * <p>
1743 * This date-time will be passed to the formatter to produce a string.
1744 *
1745 * @param formatter the formatter to use, not null
1746 * @return the formatted date-time string, not null
1747 * @throws DateTimeException if an error occurs during printing
1748 */
1749 @Override // override for Javadoc and performance
1750 public String format(DateTimeFormatter formatter) {
1751 Objects.requireNonNull(formatter, "formatter");
1752 return formatter.format(this);
1753 }
1754
1755 //-----------------------------------------------------------------------
1756 /**
1757 * Combines this date-time with an offset to create an {@code OffsetDateTime}.
1758 * <p>
1759 * This returns an {@code OffsetDateTime} formed from this date-time at the specified offset.
1760 * All possible combinations of date-time and offset are valid.
1761 *
1762 * @param offset the offset to combine with, not null
1763 * @return the offset date-time formed from this date-time and the specified offset, not null
1764 */
1765 public OffsetDateTime atOffset(ZoneOffset offset) {
1766 return OffsetDateTime.of(this, offset);
1767 }
1768
1769 /**
1770 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}.
1771 * <p>
1772 * This returns a {@code ZonedDateTime} formed from this date-time at the
1773 * specified time-zone. The result will match this date-time as closely as possible.
1774 * Time-zone rules, such as daylight savings, mean that not every local date-time
1775 * is valid for the specified zone, thus the local date-time may be adjusted.
1776 * <p>
1777 * The local date-time is resolved to a single instant on the time-line.
1778 * This is achieved by finding a valid offset from UTC/Greenwich for the local
1779 * date-time as defined by the {@link ZoneRules rules} of the zone ID.
1780 *<p>
1781 * In most cases, there is only one valid offset for a local date-time.
1782 * In the case of an overlap, where clocks are set back, there are two valid offsets.
1783 * This method uses the earlier offset typically corresponding to "summer".
1784 * <p>
1785 * In the case of a gap, where clocks jump forward, there is no valid offset.
1786 * Instead, the local date-time is adjusted to be later by the length of the gap.
1787 * For a typical one hour daylight savings change, the local date-time will be
1788 * moved one hour later into the offset typically corresponding to "summer".
1789 * <p>
1790 * To obtain the later offset during an overlap, call
1791 * {@link ZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method.
1792 * To throw an exception when there is a gap or overlap, use
1793 * {@link ZonedDateTime#ofStrict(LocalDateTime, ZoneOffset, ZoneId)}.
1794 *
1795 * @param zone the time-zone to use, not null
1796 * @return the zoned date-time formed from this date-time, not null
1797 */
1798 @Override
1799 public ZonedDateTime atZone(ZoneId zone) {
1800 return ZonedDateTime.of(this, zone);
1801 }
1802
1803 //-----------------------------------------------------------------------
1804 /**
1805 * Compares this date-time to another date-time.
1806 * <p>
1807 * The comparison is primarily based on the date-time, from earliest to latest.
1808 * It is "consistent with equals", as defined by {@link Comparable}.
1809 * <p>
1810 * If all the date-times being compared are instances of {@code LocalDateTime},
1811 * then the comparison will be entirely based on the date-time.
1812 * If some dates being compared are in different chronologies, then the
1813 * chronology is also considered, see {@link ChronoLocalDateTime#compareTo}.
1814 *
1815 * @param other the other date-time to compare to, not null
1816 * @return the comparator value, negative if less, positive if greater
1817 */
1818 @Override // override for Javadoc and performance
1819 public int compareTo(ChronoLocalDateTime<?> other) {
1820 if (other instanceof LocalDateTime) {
1821 return compareTo0((LocalDateTime) other);
1822 }
1823 return ChronoLocalDateTime.super.compareTo(other);
1824 }
1825
1826 private int compareTo0(LocalDateTime other) {
1827 int cmp = date.compareTo0(other.toLocalDate());
1828 if (cmp == 0) {
1829 cmp = time.compareTo(other.toLocalTime());
1830 }
1831 return cmp;
1832 }
1833
1834 /**
1835 * Checks if this date-time is after the specified date-time.
1836 * <p>
1837 * This checks to see if this date-time represents a point on the
1838 * local time-line after the other date-time.
1839 * <pre>
1840 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1841 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1842 * a.isAfter(b) == false
1843 * a.isAfter(a) == false
1844 * b.isAfter(a) == true
1845 * </pre>
1846 * <p>
1847 * This method only considers the position of the two date-times on the local time-line.
1848 * It does not take into account the chronology, or calendar system.
1849 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1850 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1851 *
1852 * @param other the other date-time to compare to, not null
1853 * @return true if this date-time is after the specified date-time
1854 */
1855 @Override // override for Javadoc and performance
1856 public boolean isAfter(ChronoLocalDateTime<?> other) {
1857 if (other instanceof LocalDateTime) {
1858 return compareTo0((LocalDateTime) other) > 0;
1859 }
1860 return ChronoLocalDateTime.super.isAfter(other);
1861 }
1862
1863 /**
1864 * Checks if this date-time is before the specified date-time.
1865 * <p>
1866 * This checks to see if this date-time represents a point on the
1867 * local time-line before the other date-time.
1868 * <pre>
1869 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1870 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1871 * a.isBefore(b) == true
1872 * a.isBefore(a) == false
1873 * b.isBefore(a) == false
1874 * </pre>
1875 * <p>
1876 * This method only considers the position of the two date-times on the local time-line.
1877 * It does not take into account the chronology, or calendar system.
1878 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1879 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1880 *
1881 * @param other the other date-time to compare to, not null
1882 * @return true if this date-time is before the specified date-time
1883 */
1884 @Override // override for Javadoc and performance
1885 public boolean isBefore(ChronoLocalDateTime<?> other) {
1886 if (other instanceof LocalDateTime) {
1887 return compareTo0((LocalDateTime) other) < 0;
1888 }
1889 return ChronoLocalDateTime.super.isBefore(other);
1890 }
1891
1892 /**
1893 * Checks if this date-time is equal to the specified date-time.
1894 * <p>
1895 * This checks to see if this date-time represents the same point on the
1896 * local time-line as the other date-time.
1897 * <pre>
1898 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1899 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1900 * a.isEqual(b) == false
1901 * a.isEqual(a) == true
1902 * b.isEqual(a) == false
1903 * </pre>
1904 * <p>
1905 * This method only considers the position of the two date-times on the local time-line.
1906 * It does not take into account the chronology, or calendar system.
1907 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1908 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1909 *
1910 * @param other the other date-time to compare to, not null
1911 * @return true if this date-time is equal to the specified date-time
1912 */
1913 @Override // override for Javadoc and performance
1914 public boolean isEqual(ChronoLocalDateTime<?> other) {
1915 if (other instanceof LocalDateTime) {
1916 return compareTo0((LocalDateTime) other) == 0;
1917 }
1918 return ChronoLocalDateTime.super.isEqual(other);
1919 }
1920
1921 //-----------------------------------------------------------------------
1922 /**
1923 * Checks if this date-time is equal to another date-time.
1924 * <p>
1925 * Compares this {@code LocalDateTime} with another ensuring that the date-time is the same.
1926 * Only objects of type {@code LocalDateTime} are compared, other types return false.
1927 *
1928 * @param obj the object to check, null returns false
1929 * @return true if this is equal to the other date-time
1930 */
1931 @Override
1932 public boolean equals(Object obj) {
1933 if (this == obj) {
1934 return true;
1935 }
1936 if (obj instanceof LocalDateTime) {
1937 LocalDateTime other = (LocalDateTime) obj;
1938 return date.equals(other.date) && time.equals(other.time);
1939 }
1940 return false;
1941 }
1942
1943 /**
1944 * A hash code for this date-time.
1945 *
1946 * @return a suitable hash code
1947 */
1948 @Override
1949 public int hashCode() {
1950 return date.hashCode() ^ time.hashCode();
1951 }
1952
1953 //-----------------------------------------------------------------------
1954 /**
1955 * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
1956 * <p>
1957 * The output will be one of the following ISO-8601 formats:
1958 * <ul>
1959 * <li>{@code uuuu-MM-dd'T'HH:mm}</li>
1960 * <li>{@code uuuu-MM-dd'T'HH:mm:ss}</li>
1961 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSS}</li>
1962 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}</li>
1963 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li>
1964 * </ul>
1965 * The format used will be the shortest that outputs the full value of
1966 * the time where the omitted parts are implied to be zero.
1967 *
1968 * @return a string representation of this date-time, not null
1969 */
1970 @Override
1971 public String toString() {
1972 return date.toString() + 'T' + time.toString();
1973 }
1974
1975 //-----------------------------------------------------------------------
1976 /**
1977 * Writes the object using a
1978 * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1979 * @serialData
1980 * <pre>
1981 * out.writeByte(5); // identifies a LocalDateTime
1982 * // the <a href="../../serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1983 * // the <a href="../../serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1984 * </pre>
1985 *
1986 * @return the instance of {@code Ser}, not null
1987 */
1988 private Object writeReplace() {
1989 return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
1990 }
1991
1992 /**
1993 * Defend against malicious streams.
1994 *
1995 * @param s the stream to read
1996 * @throws InvalidObjectException always
1997 */
1998 private void readObject(ObjectInputStream s) throws InvalidObjectException {
1999 throw new InvalidObjectException("Deserialization via serialization delegate");
2000 }
2001
2002 void writeExternal(DataOutput out) throws IOException {
2003 date.writeExternal(out);
2004 time.writeExternal(out);
2005 }
2006
2007 static LocalDateTime readExternal(DataInput in) throws IOException {
2008 LocalDate date = LocalDate.readExternal(in);
2009 LocalTime time = LocalTime.readExternal(in);
2010 return LocalDateTime.of(date, time);
2011 }
2012
2013 }
2014