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.temporal.ChronoField.EPOCH_DAY;
65 import static java.time.temporal.ChronoField.INSTANT_SECONDS;
66 import static java.time.temporal.ChronoField.NANO_OF_DAY;
67 import static java.time.temporal.ChronoField.OFFSET_SECONDS;
68 import static java.time.temporal.ChronoUnit.FOREVER;
69 import static java.time.temporal.ChronoUnit.NANOS;
70
71 import java.io.IOException;
72 import java.io.ObjectInput;
73 import java.io.ObjectOutput;
74 import java.io.InvalidObjectException;
75 import java.io.ObjectInputStream;
76 import java.io.Serializable;
77 import java.time.chrono.IsoChronology;
78 import java.time.format.DateTimeFormatter;
79 import java.time.format.DateTimeParseException;
80 import java.time.temporal.ChronoField;
81 import java.time.temporal.ChronoUnit;
82 import java.time.temporal.Temporal;
83 import java.time.temporal.TemporalAccessor;
84 import java.time.temporal.TemporalAdjuster;
85 import java.time.temporal.TemporalAmount;
86 import java.time.temporal.TemporalField;
87 import java.time.temporal.TemporalQueries;
88 import java.time.temporal.TemporalQuery;
89 import java.time.temporal.TemporalUnit;
90 import java.time.temporal.UnsupportedTemporalTypeException;
91 import java.time.temporal.ValueRange;
92 import java.time.zone.ZoneRules;
93 import java.util.Comparator;
94 import java.util.Objects;
95
96 /**
97 * A date-time with an offset from UTC/Greenwich in the ISO-8601 calendar system,
98 * such as {@code 2007-12-03T10:15:30+01:00}.
99 * <p>
100 * {@code OffsetDateTime} is an immutable representation of a date-time with an offset.
101 * This class stores all date and time fields, to a precision of nanoseconds,
102 * as well as the offset from UTC/Greenwich. For example, the value
103 * "2nd October 2007 at 13:45:30.123456789 +02:00" can be stored in an {@code OffsetDateTime}.
104 * <p>
105 * {@code OffsetDateTime}, {@link java.time.ZonedDateTime} and {@link java.time.Instant} all store an instant
106 * on the time-line to nanosecond precision.
107 * {@code Instant} is the simplest, simply representing the instant.
108 * {@code OffsetDateTime} adds to the instant the offset from UTC/Greenwich, which allows
109 * the local date-time to be obtained.
110 * {@code ZonedDateTime} adds full time-zone rules.
111 * <p>
112 * It is intended that {@code ZonedDateTime} or {@code Instant} is used to model data
113 * in simpler applications. This class may be used when modeling date-time concepts in
114 * more detail, or when communicating to a database or in a network protocol.
115 *
116 * <p>
117 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
118 * class; use of identity-sensitive operations (including reference equality
119 * ({@code ==}), identity hash code, or synchronization) on instances of
120 * {@code OffsetDateTime} may have unpredictable results and should be avoided.
121 * The {@code equals} method should be used for comparisons.
122 *
123 * @implSpec
124 * This class is immutable and thread-safe.
125 *
126 * @since 1.8
127 */
128 public final class OffsetDateTime
129 implements Temporal, TemporalAdjuster, Comparable<OffsetDateTime>, Serializable {
130
131 /**
132 * The minimum supported {@code OffsetDateTime}, '-999999999-01-01T00:00:00+18:00'.
133 * This is the local date-time of midnight at the start of the minimum date
134 * in the maximum offset (larger offsets are earlier on the time-line).
135 * This combines {@link LocalDateTime#MIN} and {@link ZoneOffset#MAX}.
136 * This could be used by an application as a "far past" date-time.
137 */
138 public static final OffsetDateTime MIN = LocalDateTime.MIN.atOffset(ZoneOffset.MAX);
139 /**
140 * The maximum supported {@code OffsetDateTime}, '+999999999-12-31T23:59:59.999999999-18:00'.
141 * This is the local date-time just before midnight at the end of the maximum date
142 * in the minimum offset (larger negative offsets are later on the time-line).
143 * This combines {@link LocalDateTime#MAX} and {@link ZoneOffset#MIN}.
144 * This could be used by an application as a "far future" date-time.
145 */
146 public static final OffsetDateTime MAX = LocalDateTime.MAX.atOffset(ZoneOffset.MIN);
147
148 /**
149 * Gets a comparator that compares two {@code OffsetDateTime} instances
150 * based solely on the instant.
151 * <p>
152 * This method differs from the comparison in {@link #compareTo} in that it
153 * only compares the underlying instant.
154 *
155 * @return a comparator that compares in time-line order
156 *
157 * @see #isAfter
158 * @see #isBefore
159 * @see #isEqual
160 */
161 public static Comparator<OffsetDateTime> timeLineOrder() {
162 return OffsetDateTime::compareInstant;
163 }
164
165 /**
166 * Compares this {@code OffsetDateTime} to another date-time.
167 * The comparison is based on the instant.
168 *
169 * @param datetime1 the first date-time to compare, not null
170 * @param datetime2 the other date-time to compare to, not null
171 * @return the comparator value, negative if less, positive if greater
172 */
173 private static int compareInstant(OffsetDateTime datetime1, OffsetDateTime datetime2) {
174 if (datetime1.getOffset().equals(datetime2.getOffset())) {
175 return datetime1.toLocalDateTime().compareTo(datetime2.toLocalDateTime());
176 }
177 int cmp = Long.compare(datetime1.toEpochSecond(), datetime2.toEpochSecond());
178 if (cmp == 0) {
179 cmp = datetime1.toLocalTime().getNano() - datetime2.toLocalTime().getNano();
180 }
181 return cmp;
182 }
183
184 /**
185 * Serialization version.
186 */
187 private static final long serialVersionUID = 2287754244819255394L;
188
189 /**
190 * The local date-time.
191 */
192 private final LocalDateTime dateTime;
193 /**
194 * The offset from UTC/Greenwich.
195 */
196 private final ZoneOffset offset;
197
198 //-----------------------------------------------------------------------
199 /**
200 * Obtains the current date-time from the system clock in the default time-zone.
201 * <p>
202 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
203 * time-zone to obtain the current date-time.
204 * The offset will be calculated from the time-zone in the clock.
205 * <p>
206 * Using this method will prevent the ability to use an alternate clock for testing
207 * because the clock is hard-coded.
208 *
209 * @return the current date-time using the system clock, not null
210 */
211 public static OffsetDateTime now() {
212 return now(Clock.systemDefaultZone());
213 }
214
215 /**
216 * Obtains the current date-time from the system clock in the specified time-zone.
217 * <p>
218 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
219 * Specifying the time-zone avoids dependence on the default time-zone.
220 * The offset will be calculated from the specified time-zone.
221 * <p>
222 * Using this method will prevent the ability to use an alternate clock for testing
223 * because the clock is hard-coded.
224 *
225 * @param zone the zone ID to use, not null
226 * @return the current date-time using the system clock, not null
227 */
228 public static OffsetDateTime now(ZoneId zone) {
229 return now(Clock.system(zone));
230 }
231
232 /**
233 * Obtains the current date-time from the specified clock.
234 * <p>
235 * This will query the specified clock to obtain the current date-time.
236 * The offset will be calculated from the time-zone in the clock.
237 * <p>
238 * Using this method allows the use of an alternate clock for testing.
239 * The alternate clock may be introduced using {@link Clock dependency injection}.
240 *
241 * @param clock the clock to use, not null
242 * @return the current date-time, not null
243 */
244 public static OffsetDateTime now(Clock clock) {
245 Objects.requireNonNull(clock, "clock");
246 final Instant now = clock.instant(); // called once
247 return ofInstant(now, clock.getZone().getRules().getOffset(now));
248 }
249
250 //-----------------------------------------------------------------------
251 /**
252 * Obtains an instance of {@code OffsetDateTime} from a date, time and offset.
253 * <p>
254 * This creates an offset date-time with the specified local date, time and offset.
255 *
256 * @param date the local date, not null
257 * @param time the local time, not null
258 * @param offset the zone offset, not null
259 * @return the offset date-time, not null
260 */
261 public static OffsetDateTime of(LocalDate date, LocalTime time, ZoneOffset offset) {
262 LocalDateTime dt = LocalDateTime.of(date, time);
263 return new OffsetDateTime(dt, offset);
264 }
265
266 /**
267 * Obtains an instance of {@code OffsetDateTime} from a date-time and offset.
268 * <p>
269 * This creates an offset date-time with the specified local date-time and offset.
270 *
271 * @param dateTime the local date-time, not null
272 * @param offset the zone offset, not null
273 * @return the offset date-time, not null
274 */
275 public static OffsetDateTime of(LocalDateTime dateTime, ZoneOffset offset) {
276 return new OffsetDateTime(dateTime, offset);
277 }
278
279 /**
280 * Obtains an instance of {@code OffsetDateTime} from a year, month, day,
281 * hour, minute, second, nanosecond and offset.
282 * <p>
283 * This creates an offset date-time with the seven specified fields.
284 * <p>
285 * This method exists primarily for writing test cases.
286 * Non test-code will typically use other methods to create an offset time.
287 * {@code LocalDateTime} has five additional convenience variants of the
288 * equivalent factory method taking fewer arguments.
289 * They are not provided here to reduce the footprint of the API.
290 *
291 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
292 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
293 * @param dayOfMonth the day-of-month to represent, from 1 to 31
294 * @param hour the hour-of-day to represent, from 0 to 23
295 * @param minute the minute-of-hour to represent, from 0 to 59
296 * @param second the second-of-minute to represent, from 0 to 59
297 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
298 * @param offset the zone offset, not null
299 * @return the offset date-time, not null
300 * @throws DateTimeException if the value of any field is out of range, or
301 * if the day-of-month is invalid for the month-year
302 */
303 public static OffsetDateTime of(
304 int year, int month, int dayOfMonth,
305 int hour, int minute, int second, int nanoOfSecond, ZoneOffset offset) {
306 LocalDateTime dt = LocalDateTime.of(year, month, dayOfMonth, hour, minute, second, nanoOfSecond);
307 return new OffsetDateTime(dt, offset);
308 }
309
310 //-----------------------------------------------------------------------
311 /**
312 * Obtains an instance of {@code OffsetDateTime} from an {@code Instant} and zone ID.
313 * <p>
314 * This creates an offset date-time with the same instant as that specified.
315 * Finding the offset from UTC/Greenwich is simple as there is only one valid
316 * offset for each instant.
317 *
318 * @param instant the instant to create the date-time from, not null
319 * @param zone the time-zone, which may be an offset, not null
320 * @return the offset date-time, not null
321 * @throws DateTimeException if the result exceeds the supported range
322 */
323 public static OffsetDateTime ofInstant(Instant instant, ZoneId zone) {
324 Objects.requireNonNull(instant, "instant");
325 Objects.requireNonNull(zone, "zone");
326 ZoneRules rules = zone.getRules();
327 ZoneOffset offset = rules.getOffset(instant);
328 LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
329 return new OffsetDateTime(ldt, offset);
330 }
331
332 //-----------------------------------------------------------------------
333 /**
334 * Obtains an instance of {@code OffsetDateTime} from a temporal object.
335 * <p>
336 * This obtains an offset date-time based on the specified temporal.
337 * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
338 * which this factory converts to an instance of {@code OffsetDateTime}.
339 * <p>
340 * The conversion will first obtain a {@code ZoneOffset} from the temporal object.
341 * It will then try to obtain a {@code LocalDateTime}, falling back to an {@code Instant} if necessary.
342 * The result will be the combination of {@code ZoneOffset} with either
343 * with {@code LocalDateTime} or {@code Instant}.
344 * Implementations are permitted to perform optimizations such as accessing
345 * those fields that are equivalent to the relevant objects.
346 * <p>
347 * This method matches the signature of the functional interface {@link TemporalQuery}
348 * allowing it to be used as a query via method reference, {@code OffsetDateTime::from}.
349 *
350 * @param temporal the temporal object to convert, not null
351 * @return the offset date-time, not null
352 * @throws DateTimeException if unable to convert to an {@code OffsetDateTime}
353 */
354 public static OffsetDateTime from(TemporalAccessor temporal) {
355 if (temporal instanceof OffsetDateTime) {
356 return (OffsetDateTime) temporal;
357 }
358 try {
359 ZoneOffset offset = ZoneOffset.from(temporal);
360 LocalDate date = temporal.query(TemporalQueries.localDate());
361 LocalTime time = temporal.query(TemporalQueries.localTime());
362 if (date != null && time != null) {
363 return OffsetDateTime.of(date, time, offset);
364 } else {
365 Instant instant = Instant.from(temporal);
366 return OffsetDateTime.ofInstant(instant, offset);
367 }
368 } catch (DateTimeException ex) {
369 throw new DateTimeException("Unable to obtain OffsetDateTime from TemporalAccessor: " +
370 temporal + " of type " + temporal.getClass().getName(), ex);
371 }
372 }
373
374 //-----------------------------------------------------------------------
375 /**
376 * Obtains an instance of {@code OffsetDateTime} from a text string
377 * such as {@code 2007-12-03T10:15:30+01:00}.
378 * <p>
379 * The string must represent a valid date-time and is parsed using
380 * {@link java.time.format.DateTimeFormatter#ISO_OFFSET_DATE_TIME}.
381 *
382 * @param text the text to parse such as "2007-12-03T10:15:30+01:00", not null
383 * @return the parsed offset date-time, not null
384 * @throws DateTimeParseException if the text cannot be parsed
385 */
386 public static OffsetDateTime parse(CharSequence text) {
387 return parse(text, DateTimeFormatter.ISO_OFFSET_DATE_TIME);
388 }
389
390 /**
391 * Obtains an instance of {@code OffsetDateTime} from a text string using a specific formatter.
392 * <p>
393 * The text is parsed using the formatter, returning a date-time.
394 *
395 * @param text the text to parse, not null
396 * @param formatter the formatter to use, not null
397 * @return the parsed offset date-time, not null
398 * @throws DateTimeParseException if the text cannot be parsed
399 */
400 public static OffsetDateTime parse(CharSequence text, DateTimeFormatter formatter) {
401 Objects.requireNonNull(formatter, "formatter");
402 return formatter.parse(text, OffsetDateTime::from);
403 }
404
405 //-----------------------------------------------------------------------
406 /**
407 * Constructor.
408 *
409 * @param dateTime the local date-time, not null
410 * @param offset the zone offset, not null
411 */
412 private OffsetDateTime(LocalDateTime dateTime, ZoneOffset offset) {
413 this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
414 this.offset = Objects.requireNonNull(offset, "offset");
415 }
416
417 /**
418 * Returns a new date-time based on this one, returning {@code this} where possible.
419 *
420 * @param dateTime the date-time to create with, not null
421 * @param offset the zone offset to create with, not null
422 */
423 private OffsetDateTime with(LocalDateTime dateTime, ZoneOffset offset) {
424 if (this.dateTime == dateTime && this.offset.equals(offset)) {
425 return this;
426 }
427 return new OffsetDateTime(dateTime, offset);
428 }
429
430 //-----------------------------------------------------------------------
431 /**
432 * Checks if the specified field is supported.
433 * <p>
434 * This checks if this date-time can be queried for the specified field.
435 * If false, then calling the {@link #range(TemporalField) range},
436 * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
437 * methods will throw an exception.
438 * <p>
439 * If the field is a {@link ChronoField} then the query is implemented here.
440 * The supported fields are:
441 * <ul>
442 * <li>{@code NANO_OF_SECOND}
443 * <li>{@code NANO_OF_DAY}
444 * <li>{@code MICRO_OF_SECOND}
445 * <li>{@code MICRO_OF_DAY}
446 * <li>{@code MILLI_OF_SECOND}
447 * <li>{@code MILLI_OF_DAY}
448 * <li>{@code SECOND_OF_MINUTE}
449 * <li>{@code SECOND_OF_DAY}
450 * <li>{@code MINUTE_OF_HOUR}
451 * <li>{@code MINUTE_OF_DAY}
452 * <li>{@code HOUR_OF_AMPM}
453 * <li>{@code CLOCK_HOUR_OF_AMPM}
454 * <li>{@code HOUR_OF_DAY}
455 * <li>{@code CLOCK_HOUR_OF_DAY}
456 * <li>{@code AMPM_OF_DAY}
457 * <li>{@code DAY_OF_WEEK}
458 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
459 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
460 * <li>{@code DAY_OF_MONTH}
461 * <li>{@code DAY_OF_YEAR}
462 * <li>{@code EPOCH_DAY}
463 * <li>{@code ALIGNED_WEEK_OF_MONTH}
464 * <li>{@code ALIGNED_WEEK_OF_YEAR}
465 * <li>{@code MONTH_OF_YEAR}
466 * <li>{@code PROLEPTIC_MONTH}
467 * <li>{@code YEAR_OF_ERA}
468 * <li>{@code YEAR}
469 * <li>{@code ERA}
470 * <li>{@code INSTANT_SECONDS}
471 * <li>{@code OFFSET_SECONDS}
472 * </ul>
473 * All other {@code ChronoField} instances will return false.
474 * <p>
475 * If the field is not a {@code ChronoField}, then the result of this method
476 * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
477 * passing {@code this} as the argument.
478 * Whether the field is supported is determined by the field.
479 *
480 * @param field the field to check, null returns false
481 * @return true if the field is supported on this date-time, false if not
482 */
483 @Override
484 public boolean isSupported(TemporalField field) {
485 return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
486 }
487
488 /**
489 * Checks if the specified unit is supported.
490 * <p>
491 * This checks if the specified unit can be added to, or subtracted from, this date-time.
492 * If false, then calling the {@link #plus(long, TemporalUnit)} and
493 * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
494 * <p>
495 * If the unit is a {@link ChronoUnit} then the query is implemented here.
496 * The supported units are:
497 * <ul>
498 * <li>{@code NANOS}
499 * <li>{@code MICROS}
500 * <li>{@code MILLIS}
501 * <li>{@code SECONDS}
502 * <li>{@code MINUTES}
503 * <li>{@code HOURS}
504 * <li>{@code HALF_DAYS}
505 * <li>{@code DAYS}
506 * <li>{@code WEEKS}
507 * <li>{@code MONTHS}
508 * <li>{@code YEARS}
509 * <li>{@code DECADES}
510 * <li>{@code CENTURIES}
511 * <li>{@code MILLENNIA}
512 * <li>{@code ERAS}
513 * </ul>
514 * All other {@code ChronoUnit} instances will return false.
515 * <p>
516 * If the unit is not a {@code ChronoUnit}, then the result of this method
517 * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
518 * passing {@code this} as the argument.
519 * Whether the unit is supported is determined by the unit.
520 *
521 * @param unit the unit to check, null returns false
522 * @return true if the unit can be added/subtracted, false if not
523 */
524 @Override // override for Javadoc
525 public boolean isSupported(TemporalUnit unit) {
526 if (unit instanceof ChronoUnit) {
527 return unit != FOREVER;
528 }
529 return unit != null && unit.isSupportedBy(this);
530 }
531
532 //-----------------------------------------------------------------------
533 /**
534 * Gets the range of valid values for the specified field.
535 * <p>
536 * The range object expresses the minimum and maximum valid values for a field.
537 * This date-time is used to enhance the accuracy of the returned range.
538 * If it is not possible to return the range, because the field is not supported
539 * or for some other reason, an exception is thrown.
540 * <p>
541 * If the field is a {@link ChronoField} then the query is implemented here.
542 * The {@link #isSupported(TemporalField) supported fields} will return
543 * appropriate range instances.
544 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
545 * <p>
546 * If the field is not a {@code ChronoField}, then the result of this method
547 * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
548 * passing {@code this} as the argument.
549 * Whether the range can be obtained is determined by the field.
550 *
551 * @param field the field to query the range for, not null
552 * @return the range of valid values for the field, not null
553 * @throws DateTimeException if the range for the field cannot be obtained
554 * @throws UnsupportedTemporalTypeException if the field is not supported
555 */
556 @Override
557 public ValueRange range(TemporalField field) {
558 if (field instanceof ChronoField) {
559 if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {
560 return field.range();
561 }
562 return dateTime.range(field);
563 }
564 return field.rangeRefinedBy(this);
565 }
566
567 /**
568 * Gets the value of the specified field from this date-time as an {@code int}.
569 * <p>
570 * This queries this date-time for the value of the specified field.
571 * The returned value will always be within the valid range of values for the field.
572 * If it is not possible to return the value, because the field is not supported
573 * or for some other reason, an exception is thrown.
574 * <p>
575 * If the field is a {@link ChronoField} then the query is implemented here.
576 * The {@link #isSupported(TemporalField) supported fields} will return valid
577 * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
578 * {@code EPOCH_DAY}, {@code PROLEPTIC_MONTH} and {@code INSTANT_SECONDS} which are too
579 * large to fit in an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
580 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
581 * <p>
582 * If the field is not a {@code ChronoField}, then the result of this method
583 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
584 * passing {@code this} as the argument. Whether the value can be obtained,
585 * and what the value represents, is determined by the field.
586 *
587 * @param field the field to get, not null
588 * @return the value for the field
589 * @throws DateTimeException if a value for the field cannot be obtained or
590 * the value is outside the range of valid values for the field
591 * @throws UnsupportedTemporalTypeException if the field is not supported or
592 * the range of values exceeds an {@code int}
593 * @throws ArithmeticException if numeric overflow occurs
594 */
595 @Override
596 public int get(TemporalField field) {
597 if (field instanceof ChronoField) {
598 switch ((ChronoField) field) {
599 case INSTANT_SECONDS:
600 throw new UnsupportedTemporalTypeException("Invalid field 'InstantSeconds' for get() method, use getLong() instead");
601 case OFFSET_SECONDS:
602 return getOffset().getTotalSeconds();
603 }
604 return dateTime.get(field);
605 }
606 return Temporal.super.get(field);
607 }
608
609 /**
610 * Gets the value of the specified field from this date-time as a {@code long}.
611 * <p>
612 * This queries this date-time for the value of the specified field.
613 * If it is not possible to return the value, because the field is not supported
614 * or for some other reason, an exception is thrown.
615 * <p>
616 * If the field is a {@link ChronoField} then the query is implemented here.
617 * The {@link #isSupported(TemporalField) supported fields} will return valid
618 * values based on this date-time.
619 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
620 * <p>
621 * If the field is not a {@code ChronoField}, then the result of this method
622 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
623 * passing {@code this} as the argument. Whether the value can be obtained,
624 * and what the value represents, is determined by the field.
625 *
626 * @param field the field to get, not null
627 * @return the value for the field
628 * @throws DateTimeException if a value for the field cannot be obtained
629 * @throws UnsupportedTemporalTypeException if the field is not supported
630 * @throws ArithmeticException if numeric overflow occurs
631 */
632 @Override
633 public long getLong(TemporalField field) {
634 if (field instanceof ChronoField) {
635 switch ((ChronoField) field) {
636 case INSTANT_SECONDS: return toEpochSecond();
637 case OFFSET_SECONDS: return getOffset().getTotalSeconds();
638 }
639 return dateTime.getLong(field);
640 }
641 return field.getFrom(this);
642 }
643
644 //-----------------------------------------------------------------------
645 /**
646 * Gets the zone offset, such as '+01:00'.
647 * <p>
648 * This is the offset of the local date-time from UTC/Greenwich.
649 *
650 * @return the zone offset, not null
651 */
652 public ZoneOffset getOffset() {
653 return offset;
654 }
655
656 /**
657 * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
658 * that the result has the same local date-time.
659 * <p>
660 * This method returns an object with the same {@code LocalDateTime} and the specified {@code ZoneOffset}.
661 * No calculation is needed or performed.
662 * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
663 * {@code +03:00}, then this method will return {@code 2007-12-03T10:30+03:00}.
664 * <p>
665 * To take into account the difference between the offsets, and adjust the time fields,
666 * use {@link #withOffsetSameInstant}.
667 * <p>
668 * This instance is immutable and unaffected by this method call.
669 *
670 * @param offset the zone offset to change to, not null
671 * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
672 */
673 public OffsetDateTime withOffsetSameLocal(ZoneOffset offset) {
674 return with(dateTime, offset);
675 }
676
677 /**
678 * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
679 * that the result is at the same instant.
680 * <p>
681 * This method returns an object with the specified {@code ZoneOffset} and a {@code LocalDateTime}
682 * adjusted by the difference between the two offsets.
683 * This will result in the old and new objects representing the same instant.
684 * This is useful for finding the local time in a different offset.
685 * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
686 * {@code +03:00}, then this method will return {@code 2007-12-03T11:30+03:00}.
687 * <p>
688 * To change the offset without adjusting the local time use {@link #withOffsetSameLocal}.
689 * <p>
690 * This instance is immutable and unaffected by this method call.
691 *
692 * @param offset the zone offset to change to, not null
693 * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
694 * @throws DateTimeException if the result exceeds the supported date range
695 */
696 public OffsetDateTime withOffsetSameInstant(ZoneOffset offset) {
697 if (offset.equals(this.offset)) {
698 return this;
699 }
700 int difference = offset.getTotalSeconds() - this.offset.getTotalSeconds();
701 LocalDateTime adjusted = dateTime.plusSeconds(difference);
702 return new OffsetDateTime(adjusted, offset);
703 }
704
705 //-----------------------------------------------------------------------
706 /**
707 * Gets the {@code LocalDateTime} part of this date-time.
708 * <p>
709 * This returns a {@code LocalDateTime} with the same year, month, day and time
710 * as this date-time.
711 *
712 * @return the local date-time part of this date-time, not null
713 */
714 public LocalDateTime toLocalDateTime() {
715 return dateTime;
716 }
717
718 //-----------------------------------------------------------------------
719 /**
720 * Gets the {@code LocalDate} part of this date-time.
721 * <p>
722 * This returns a {@code LocalDate} with the same year, month and day
723 * as this date-time.
724 *
725 * @return the date part of this date-time, not null
726 */
727 public LocalDate toLocalDate() {
728 return dateTime.toLocalDate();
729 }
730
731 /**
732 * Gets the year field.
733 * <p>
734 * This method returns the primitive {@code int} value for the year.
735 * <p>
736 * The year returned by this method is proleptic as per {@code get(YEAR)}.
737 * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
738 *
739 * @return the year, from MIN_YEAR to MAX_YEAR
740 */
741 public int getYear() {
742 return dateTime.getYear();
743 }
744
745 /**
746 * Gets the month-of-year field from 1 to 12.
747 * <p>
748 * This method returns the month as an {@code int} from 1 to 12.
749 * Application code is frequently clearer if the enum {@link Month}
750 * is used by calling {@link #getMonth()}.
751 *
752 * @return the month-of-year, from 1 to 12
753 * @see #getMonth()
754 */
755 public int getMonthValue() {
756 return dateTime.getMonthValue();
757 }
758
759 /**
760 * Gets the month-of-year field using the {@code Month} enum.
761 * <p>
762 * This method returns the enum {@link Month} for the month.
763 * This avoids confusion as to what {@code int} values mean.
764 * If you need access to the primitive {@code int} value then the enum
765 * provides the {@link Month#getValue() int value}.
766 *
767 * @return the month-of-year, not null
768 * @see #getMonthValue()
769 */
770 public Month getMonth() {
771 return dateTime.getMonth();
772 }
773
774 /**
775 * Gets the day-of-month field.
776 * <p>
777 * This method returns the primitive {@code int} value for the day-of-month.
778 *
779 * @return the day-of-month, from 1 to 31
780 */
781 public int getDayOfMonth() {
782 return dateTime.getDayOfMonth();
783 }
784
785 /**
786 * Gets the day-of-year field.
787 * <p>
788 * This method returns the primitive {@code int} value for the day-of-year.
789 *
790 * @return the day-of-year, from 1 to 365, or 366 in a leap year
791 */
792 public int getDayOfYear() {
793 return dateTime.getDayOfYear();
794 }
795
796 /**
797 * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
798 * <p>
799 * This method returns the enum {@link DayOfWeek} for the day-of-week.
800 * This avoids confusion as to what {@code int} values mean.
801 * If you need access to the primitive {@code int} value then the enum
802 * provides the {@link DayOfWeek#getValue() int value}.
803 * <p>
804 * Additional information can be obtained from the {@code DayOfWeek}.
805 * This includes textual names of the values.
806 *
807 * @return the day-of-week, not null
808 */
809 public DayOfWeek getDayOfWeek() {
810 return dateTime.getDayOfWeek();
811 }
812
813 //-----------------------------------------------------------------------
814 /**
815 * Gets the {@code LocalTime} part of this date-time.
816 * <p>
817 * This returns a {@code LocalTime} with the same hour, minute, second and
818 * nanosecond as this date-time.
819 *
820 * @return the time part of this date-time, not null
821 */
822 public LocalTime toLocalTime() {
823 return dateTime.toLocalTime();
824 }
825
826 /**
827 * Gets the hour-of-day field.
828 *
829 * @return the hour-of-day, from 0 to 23
830 */
831 public int getHour() {
832 return dateTime.getHour();
833 }
834
835 /**
836 * Gets the minute-of-hour field.
837 *
838 * @return the minute-of-hour, from 0 to 59
839 */
840 public int getMinute() {
841 return dateTime.getMinute();
842 }
843
844 /**
845 * Gets the second-of-minute field.
846 *
847 * @return the second-of-minute, from 0 to 59
848 */
849 public int getSecond() {
850 return dateTime.getSecond();
851 }
852
853 /**
854 * Gets the nano-of-second field.
855 *
856 * @return the nano-of-second, from 0 to 999,999,999
857 */
858 public int getNano() {
859 return dateTime.getNano();
860 }
861
862 //-----------------------------------------------------------------------
863 /**
864 * Returns an adjusted copy of this date-time.
865 * <p>
866 * This returns an {@code OffsetDateTime}, based on this one, with the date-time adjusted.
867 * The adjustment takes place using the specified adjuster strategy object.
868 * Read the documentation of the adjuster to understand what adjustment will be made.
869 * <p>
870 * A simple adjuster might simply set the one of the fields, such as the year field.
871 * A more complex adjuster might set the date to the last day of the month.
872 * A selection of common adjustments is provided in
873 * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
874 * These include finding the "last day of the month" and "next Wednesday".
875 * Key date-time classes also implement the {@code TemporalAdjuster} interface,
876 * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
877 * The adjuster is responsible for handling special cases, such as the varying
878 * lengths of month and leap years.
879 * <p>
880 * For example this code returns a date on the last day of July:
881 * <pre>
882 * import static java.time.Month.*;
883 * import static java.time.temporal.TemporalAdjusters.*;
884 *
885 * result = offsetDateTime.with(JULY).with(lastDayOfMonth());
886 * </pre>
887 * <p>
888 * The classes {@link LocalDate}, {@link LocalTime} and {@link ZoneOffset} implement
889 * {@code TemporalAdjuster}, thus this method can be used to change the date, time or offset:
890 * <pre>
891 * result = offsetDateTime.with(date);
892 * result = offsetDateTime.with(time);
893 * result = offsetDateTime.with(offset);
894 * </pre>
895 * <p>
896 * The result of this method is obtained by invoking the
897 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
898 * specified adjuster passing {@code this} as the argument.
899 * <p>
900 * This instance is immutable and unaffected by this method call.
901 *
902 * @param adjuster the adjuster to use, not null
903 * @return an {@code OffsetDateTime} based on {@code this} with the adjustment made, not null
904 * @throws DateTimeException if the adjustment cannot be made
905 * @throws ArithmeticException if numeric overflow occurs
906 */
907 @Override
908 public OffsetDateTime with(TemporalAdjuster adjuster) {
909 // optimizations
910 if (adjuster instanceof LocalDate || adjuster instanceof LocalTime || adjuster instanceof LocalDateTime) {
911 return with(dateTime.with(adjuster), offset);
912 } else if (adjuster instanceof Instant) {
913 return ofInstant((Instant) adjuster, offset);
914 } else if (adjuster instanceof ZoneOffset) {
915 return with(dateTime, (ZoneOffset) adjuster);
916 } else if (adjuster instanceof OffsetDateTime) {
917 return (OffsetDateTime) adjuster;
918 }
919 return (OffsetDateTime) adjuster.adjustInto(this);
920 }
921
922 /**
923 * Returns a copy of this date-time with the specified field set to a new value.
924 * <p>
925 * This returns an {@code OffsetDateTime}, based on this one, with the value
926 * for the specified field changed.
927 * This can be used to change any supported field, such as the year, month or day-of-month.
928 * If it is not possible to set the value, because the field is not supported or for
929 * some other reason, an exception is thrown.
930 * <p>
931 * In some cases, changing the specified field can cause the resulting date-time to become invalid,
932 * such as changing the month from 31st January to February would make the day-of-month invalid.
933 * In cases like this, the field is responsible for resolving the date. Typically it will choose
934 * the previous valid date, which would be the last valid day of February in this example.
935 * <p>
936 * If the field is a {@link ChronoField} then the adjustment is implemented here.
937 * <p>
938 * The {@code INSTANT_SECONDS} field will return a date-time with the specified instant.
939 * The offset and nano-of-second are unchanged.
940 * If the new instant value is outside the valid range then a {@code DateTimeException} will be thrown.
941 * <p>
942 * The {@code OFFSET_SECONDS} field will return a date-time with the specified offset.
943 * The local date-time is unaltered. If the new offset value is outside the valid range
944 * then a {@code DateTimeException} will be thrown.
945 * <p>
946 * The other {@link #isSupported(TemporalField) supported fields} will behave as per
947 * the matching method on {@link LocalDateTime#with(TemporalField, long) LocalDateTime}.
948 * In this case, the offset is not part of the calculation and will be unchanged.
949 * <p>
950 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
951 * <p>
952 * If the field is not a {@code ChronoField}, then the result of this method
953 * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
954 * passing {@code this} as the argument. In this case, the field determines
955 * whether and how to adjust the instant.
956 * <p>
957 * This instance is immutable and unaffected by this method call.
958 *
959 * @param field the field to set in the result, not null
960 * @param newValue the new value of the field in the result
961 * @return an {@code OffsetDateTime} based on {@code this} with the specified field set, not null
962 * @throws DateTimeException if the field cannot be set
963 * @throws UnsupportedTemporalTypeException if the field is not supported
964 * @throws ArithmeticException if numeric overflow occurs
965 */
966 @Override
967 public OffsetDateTime with(TemporalField field, long newValue) {
968 if (field instanceof ChronoField) {
969 ChronoField f = (ChronoField) field;
970 switch (f) {
971 case INSTANT_SECONDS: return ofInstant(Instant.ofEpochSecond(newValue, getNano()), offset);
972 case OFFSET_SECONDS: {
973 return with(dateTime, ZoneOffset.ofTotalSeconds(f.checkValidIntValue(newValue)));
974 }
975 }
976 return with(dateTime.with(field, newValue), offset);
977 }
978 return field.adjustInto(this, newValue);
979 }
980
981 //-----------------------------------------------------------------------
982 /**
983 * Returns a copy of this {@code OffsetDateTime} with the year altered.
984 * <p>
985 * The time and offset do not affect the calculation and will be the same in the result.
986 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
987 * <p>
988 * This instance is immutable and unaffected by this method call.
989 *
990 * @param year the year to set in the result, from MIN_YEAR to MAX_YEAR
991 * @return an {@code OffsetDateTime} based on this date-time with the requested year, not null
992 * @throws DateTimeException if the year value is invalid
993 */
994 public OffsetDateTime withYear(int year) {
995 return with(dateTime.withYear(year), offset);
996 }
997
998 /**
999 * Returns a copy of this {@code OffsetDateTime} with the month-of-year altered.
1000 * <p>
1001 * The time and offset do not affect the calculation and will be the same in the result.
1002 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
1003 * <p>
1004 * This instance is immutable and unaffected by this method call.
1005 *
1006 * @param month the month-of-year to set in the result, from 1 (January) to 12 (December)
1007 * @return an {@code OffsetDateTime} based on this date-time with the requested month, not null
1008 * @throws DateTimeException if the month-of-year value is invalid
1009 */
1010 public OffsetDateTime withMonth(int month) {
1011 return with(dateTime.withMonth(month), offset);
1012 }
1013
1014 /**
1015 * Returns a copy of this {@code OffsetDateTime} with the day-of-month altered.
1016 * <p>
1017 * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
1018 * The time and offset do not affect the calculation and will be the same in the result.
1019 * <p>
1020 * This instance is immutable and unaffected by this method call.
1021 *
1022 * @param dayOfMonth the day-of-month to set in the result, from 1 to 28-31
1023 * @return an {@code OffsetDateTime} based on this date-time with the requested day, not null
1024 * @throws DateTimeException if the day-of-month value is invalid,
1025 * or if the day-of-month is invalid for the month-year
1026 */
1027 public OffsetDateTime withDayOfMonth(int dayOfMonth) {
1028 return with(dateTime.withDayOfMonth(dayOfMonth), offset);
1029 }
1030
1031 /**
1032 * Returns a copy of this {@code OffsetDateTime} with the day-of-year altered.
1033 * <p>
1034 * The time and offset do not affect the calculation and will be the same in the result.
1035 * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
1036 * <p>
1037 * This instance is immutable and unaffected by this method call.
1038 *
1039 * @param dayOfYear the day-of-year to set in the result, from 1 to 365-366
1040 * @return an {@code OffsetDateTime} based on this date with the requested day, not null
1041 * @throws DateTimeException if the day-of-year value is invalid,
1042 * or if the day-of-year is invalid for the year
1043 */
1044 public OffsetDateTime withDayOfYear(int dayOfYear) {
1045 return with(dateTime.withDayOfYear(dayOfYear), offset);
1046 }
1047
1048 //-----------------------------------------------------------------------
1049 /**
1050 * Returns a copy of this {@code OffsetDateTime} with the hour-of-day altered.
1051 * <p>
1052 * The date and offset do not affect the calculation and will be the same in the result.
1053 * <p>
1054 * This instance is immutable and unaffected by this method call.
1055 *
1056 * @param hour the hour-of-day to set in the result, from 0 to 23
1057 * @return an {@code OffsetDateTime} based on this date-time with the requested hour, not null
1058 * @throws DateTimeException if the hour value is invalid
1059 */
1060 public OffsetDateTime withHour(int hour) {
1061 return with(dateTime.withHour(hour), offset);
1062 }
1063
1064 /**
1065 * Returns a copy of this {@code OffsetDateTime} with the minute-of-hour altered.
1066 * <p>
1067 * The date and offset do not affect the calculation and will be the same in the result.
1068 * <p>
1069 * This instance is immutable and unaffected by this method call.
1070 *
1071 * @param minute the minute-of-hour to set in the result, from 0 to 59
1072 * @return an {@code OffsetDateTime} based on this date-time with the requested minute, not null
1073 * @throws DateTimeException if the minute value is invalid
1074 */
1075 public OffsetDateTime withMinute(int minute) {
1076 return with(dateTime.withMinute(minute), offset);
1077 }
1078
1079 /**
1080 * Returns a copy of this {@code OffsetDateTime} with the second-of-minute altered.
1081 * <p>
1082 * The date and offset do not affect the calculation and will be the same in the result.
1083 * <p>
1084 * This instance is immutable and unaffected by this method call.
1085 *
1086 * @param second the second-of-minute to set in the result, from 0 to 59
1087 * @return an {@code OffsetDateTime} based on this date-time with the requested second, not null
1088 * @throws DateTimeException if the second value is invalid
1089 */
1090 public OffsetDateTime withSecond(int second) {
1091 return with(dateTime.withSecond(second), offset);
1092 }
1093
1094 /**
1095 * Returns a copy of this {@code OffsetDateTime} with the nano-of-second altered.
1096 * <p>
1097 * The date and offset do not affect the calculation and will be the same in the result.
1098 * <p>
1099 * This instance is immutable and unaffected by this method call.
1100 *
1101 * @param nanoOfSecond the nano-of-second to set in the result, from 0 to 999,999,999
1102 * @return an {@code OffsetDateTime} based on this date-time with the requested nanosecond, not null
1103 * @throws DateTimeException if the nano value is invalid
1104 */
1105 public OffsetDateTime withNano(int nanoOfSecond) {
1106 return with(dateTime.withNano(nanoOfSecond), offset);
1107 }
1108
1109 //-----------------------------------------------------------------------
1110 /**
1111 * Returns a copy of this {@code OffsetDateTime} with the time truncated.
1112 * <p>
1113 * Truncation returns a copy of the original date-time with fields
1114 * smaller than the specified unit set to zero.
1115 * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1116 * will set the second-of-minute and nano-of-second field to zero.
1117 * <p>
1118 * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
1119 * that divides into the length of a standard day without remainder.
1120 * This includes all supplied time units on {@link ChronoUnit} and
1121 * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
1122 * <p>
1123 * The offset does not affect the calculation and will be the same in the result.
1124 * <p>
1125 * This instance is immutable and unaffected by this method call.
1126 *
1127 * @param unit the unit to truncate to, not null
1128 * @return an {@code OffsetDateTime} based on this date-time with the time truncated, not null
1129 * @throws DateTimeException if unable to truncate
1130 * @throws UnsupportedTemporalTypeException if the unit is not supported
1131 */
1132 public OffsetDateTime truncatedTo(TemporalUnit unit) {
1133 return with(dateTime.truncatedTo(unit), offset);
1134 }
1135
1136 //-----------------------------------------------------------------------
1137 /**
1138 * Returns a copy of this date-time with the specified amount added.
1139 * <p>
1140 * This returns an {@code OffsetDateTime}, based on this one, with the specified amount added.
1141 * The amount is typically {@link Period} or {@link Duration} but may be
1142 * any other type implementing the {@link TemporalAmount} interface.
1143 * <p>
1144 * The calculation is delegated to the amount object by calling
1145 * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
1146 * to implement the addition in any way it wishes, however it typically
1147 * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
1148 * of the amount implementation to determine if it can be successfully added.
1149 * <p>
1150 * This instance is immutable and unaffected by this method call.
1151 *
1152 * @param amountToAdd the amount to add, not null
1153 * @return an {@code OffsetDateTime} based on this date-time with the addition made, not null
1154 * @throws DateTimeException if the addition cannot be made
1155 * @throws ArithmeticException if numeric overflow occurs
1156 */
1157 @Override
1158 public OffsetDateTime plus(TemporalAmount amountToAdd) {
1159 return (OffsetDateTime) amountToAdd.addTo(this);
1160 }
1161
1162 /**
1163 * Returns a copy of this date-time with the specified amount added.
1164 * <p>
1165 * This returns an {@code OffsetDateTime}, based on this one, with the amount
1166 * in terms of the unit added. If it is not possible to add the amount, because the
1167 * unit is not supported or for some other reason, an exception is thrown.
1168 * <p>
1169 * If the field is a {@link ChronoUnit} then the addition is implemented by
1170 * {@link LocalDateTime#plus(long, TemporalUnit)}.
1171 * The offset is not part of the calculation and will be unchanged in the result.
1172 * <p>
1173 * If the field is not a {@code ChronoUnit}, then the result of this method
1174 * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
1175 * passing {@code this} as the argument. In this case, the unit determines
1176 * whether and how to perform the addition.
1177 * <p>
1178 * This instance is immutable and unaffected by this method call.
1179 *
1180 * @param amountToAdd the amount of the unit to add to the result, may be negative
1181 * @param unit the unit of the amount to add, not null
1182 * @return an {@code OffsetDateTime} based on this date-time with the specified amount added, not null
1183 * @throws DateTimeException if the addition cannot be made
1184 * @throws UnsupportedTemporalTypeException if the unit is not supported
1185 * @throws ArithmeticException if numeric overflow occurs
1186 */
1187 @Override
1188 public OffsetDateTime plus(long amountToAdd, TemporalUnit unit) {
1189 if (unit instanceof ChronoUnit) {
1190 return with(dateTime.plus(amountToAdd, unit), offset);
1191 }
1192 return unit.addTo(this, amountToAdd);
1193 }
1194
1195 //-----------------------------------------------------------------------
1196 /**
1197 * Returns a copy of this {@code OffsetDateTime} with the specified number of years added.
1198 * <p>
1199 * This method adds the specified amount to the years field in three steps:
1200 * <ol>
1201 * <li>Add the input years to the year field</li>
1202 * <li>Check if the resulting date would be invalid</li>
1203 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1204 * </ol>
1205 * <p>
1206 * For example, 2008-02-29 (leap year) plus one year would result in the
1207 * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1208 * result, the last valid day of the month, 2009-02-28, is selected instead.
1209 * <p>
1210 * This instance is immutable and unaffected by this method call.
1211 *
1212 * @param years the years to add, may be negative
1213 * @return an {@code OffsetDateTime} based on this date-time with the years added, not null
1214 * @throws DateTimeException if the result exceeds the supported date range
1215 */
1216 public OffsetDateTime plusYears(long years) {
1217 return with(dateTime.plusYears(years), offset);
1218 }
1219
1220 /**
1221 * Returns a copy of this {@code OffsetDateTime} with the specified number of months added.
1222 * <p>
1223 * This method adds the specified amount to the months field in three steps:
1224 * <ol>
1225 * <li>Add the input months to the month-of-year field</li>
1226 * <li>Check if the resulting date would be invalid</li>
1227 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1228 * </ol>
1229 * <p>
1230 * For example, 2007-03-31 plus one month would result in the invalid date
1231 * 2007-04-31. Instead of returning an invalid result, the last valid day
1232 * of the month, 2007-04-30, is selected instead.
1233 * <p>
1234 * This instance is immutable and unaffected by this method call.
1235 *
1236 * @param months the months to add, may be negative
1237 * @return an {@code OffsetDateTime} based on this date-time with the months added, not null
1238 * @throws DateTimeException if the result exceeds the supported date range
1239 */
1240 public OffsetDateTime plusMonths(long months) {
1241 return with(dateTime.plusMonths(months), offset);
1242 }
1243
1244 /**
1245 * Returns a copy of this OffsetDateTime with the specified number of weeks added.
1246 * <p>
1247 * This method adds the specified amount in weeks to the days field incrementing
1248 * the month and year fields as necessary to ensure the result remains valid.
1249 * The result is only invalid if the maximum/minimum year is exceeded.
1250 * <p>
1251 * For example, 2008-12-31 plus one week would result in 2009-01-07.
1252 * <p>
1253 * This instance is immutable and unaffected by this method call.
1254 *
1255 * @param weeks the weeks to add, may be negative
1256 * @return an {@code OffsetDateTime} based on this date-time with the weeks added, not null
1257 * @throws DateTimeException if the result exceeds the supported date range
1258 */
1259 public OffsetDateTime plusWeeks(long weeks) {
1260 return with(dateTime.plusWeeks(weeks), offset);
1261 }
1262
1263 /**
1264 * Returns a copy of this OffsetDateTime with the specified number of days added.
1265 * <p>
1266 * This method adds the specified amount to the days field incrementing the
1267 * month and year fields as necessary to ensure the result remains valid.
1268 * The result is only invalid if the maximum/minimum year is exceeded.
1269 * <p>
1270 * For example, 2008-12-31 plus one day would result in 2009-01-01.
1271 * <p>
1272 * This instance is immutable and unaffected by this method call.
1273 *
1274 * @param days the days to add, may be negative
1275 * @return an {@code OffsetDateTime} based on this date-time with the days added, not null
1276 * @throws DateTimeException if the result exceeds the supported date range
1277 */
1278 public OffsetDateTime plusDays(long days) {
1279 return with(dateTime.plusDays(days), offset);
1280 }
1281
1282 /**
1283 * Returns a copy of this {@code OffsetDateTime} with the specified number of hours added.
1284 * <p>
1285 * This instance is immutable and unaffected by this method call.
1286 *
1287 * @param hours the hours to add, may be negative
1288 * @return an {@code OffsetDateTime} based on this date-time with the hours added, not null
1289 * @throws DateTimeException if the result exceeds the supported date range
1290 */
1291 public OffsetDateTime plusHours(long hours) {
1292 return with(dateTime.plusHours(hours), offset);
1293 }
1294
1295 /**
1296 * Returns a copy of this {@code OffsetDateTime} with the specified number of minutes added.
1297 * <p>
1298 * This instance is immutable and unaffected by this method call.
1299 *
1300 * @param minutes the minutes to add, may be negative
1301 * @return an {@code OffsetDateTime} based on this date-time with the minutes added, not null
1302 * @throws DateTimeException if the result exceeds the supported date range
1303 */
1304 public OffsetDateTime plusMinutes(long minutes) {
1305 return with(dateTime.plusMinutes(minutes), offset);
1306 }
1307
1308 /**
1309 * Returns a copy of this {@code OffsetDateTime} with the specified number of seconds added.
1310 * <p>
1311 * This instance is immutable and unaffected by this method call.
1312 *
1313 * @param seconds the seconds to add, may be negative
1314 * @return an {@code OffsetDateTime} based on this date-time with the seconds added, not null
1315 * @throws DateTimeException if the result exceeds the supported date range
1316 */
1317 public OffsetDateTime plusSeconds(long seconds) {
1318 return with(dateTime.plusSeconds(seconds), offset);
1319 }
1320
1321 /**
1322 * Returns a copy of this {@code OffsetDateTime} with the specified number of nanoseconds added.
1323 * <p>
1324 * This instance is immutable and unaffected by this method call.
1325 *
1326 * @param nanos the nanos to add, may be negative
1327 * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds added, not null
1328 * @throws DateTimeException if the unit cannot be added to this type
1329 */
1330 public OffsetDateTime plusNanos(long nanos) {
1331 return with(dateTime.plusNanos(nanos), offset);
1332 }
1333
1334 //-----------------------------------------------------------------------
1335 /**
1336 * Returns a copy of this date-time with the specified amount subtracted.
1337 * <p>
1338 * This returns an {@code OffsetDateTime}, based on this one, with the specified amount subtracted.
1339 * The amount is typically {@link Period} or {@link Duration} but may be
1340 * any other type implementing the {@link TemporalAmount} interface.
1341 * <p>
1342 * The calculation is delegated to the amount object by calling
1343 * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
1344 * to implement the subtraction in any way it wishes, however it typically
1345 * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
1346 * of the amount implementation to determine if it can be successfully subtracted.
1347 * <p>
1348 * This instance is immutable and unaffected by this method call.
1349 *
1350 * @param amountToSubtract the amount to subtract, not null
1351 * @return an {@code OffsetDateTime} based on this date-time with the subtraction made, not null
1352 * @throws DateTimeException if the subtraction cannot be made
1353 * @throws ArithmeticException if numeric overflow occurs
1354 */
1355 @Override
1356 public OffsetDateTime minus(TemporalAmount amountToSubtract) {
1357 return (OffsetDateTime) amountToSubtract.subtractFrom(this);
1358 }
1359
1360 /**
1361 * Returns a copy of this date-time with the specified amount subtracted.
1362 * <p>
1363 * This returns an {@code OffsetDateTime}, based on this one, with the amount
1364 * in terms of the unit subtracted. If it is not possible to subtract the amount,
1365 * because the unit is not supported or for some other reason, an exception is thrown.
1366 * <p>
1367 * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
1368 * See that method for a full description of how addition, and thus subtraction, works.
1369 * <p>
1370 * This instance is immutable and unaffected by this method call.
1371 *
1372 * @param amountToSubtract the amount of the unit to subtract from the result, may be negative
1373 * @param unit the unit of the amount to subtract, not null
1374 * @return an {@code OffsetDateTime} based on this date-time with the specified amount subtracted, not null
1375 * @throws DateTimeException if the subtraction cannot be made
1376 * @throws UnsupportedTemporalTypeException if the unit is not supported
1377 * @throws ArithmeticException if numeric overflow occurs
1378 */
1379 @Override
1380 public OffsetDateTime minus(long amountToSubtract, TemporalUnit unit) {
1381 return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1382 }
1383
1384 //-----------------------------------------------------------------------
1385 /**
1386 * Returns a copy of this {@code OffsetDateTime} with the specified number of years subtracted.
1387 * <p>
1388 * This method subtracts the specified amount from the years field in three steps:
1389 * <ol>
1390 * <li>Subtract the input years from the year field</li>
1391 * <li>Check if the resulting date would be invalid</li>
1392 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1393 * </ol>
1394 * <p>
1395 * For example, 2008-02-29 (leap year) minus one year would result in the
1396 * invalid date 2007-02-29 (standard year). Instead of returning an invalid
1397 * result, the last valid day of the month, 2007-02-28, is selected instead.
1398 * <p>
1399 * This instance is immutable and unaffected by this method call.
1400 *
1401 * @param years the years to subtract, may be negative
1402 * @return an {@code OffsetDateTime} based on this date-time with the years subtracted, not null
1403 * @throws DateTimeException if the result exceeds the supported date range
1404 */
1405 public OffsetDateTime minusYears(long years) {
1406 return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1407 }
1408
1409 /**
1410 * Returns a copy of this {@code OffsetDateTime} with the specified number of months subtracted.
1411 * <p>
1412 * This method subtracts the specified amount from the months field in three steps:
1413 * <ol>
1414 * <li>Subtract the input months from the month-of-year field</li>
1415 * <li>Check if the resulting date would be invalid</li>
1416 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1417 * </ol>
1418 * <p>
1419 * For example, 2007-03-31 minus one month would result in the invalid date
1420 * 2007-02-31. Instead of returning an invalid result, the last valid day
1421 * of the month, 2007-02-28, is selected instead.
1422 * <p>
1423 * This instance is immutable and unaffected by this method call.
1424 *
1425 * @param months the months to subtract, may be negative
1426 * @return an {@code OffsetDateTime} based on this date-time with the months subtracted, not null
1427 * @throws DateTimeException if the result exceeds the supported date range
1428 */
1429 public OffsetDateTime minusMonths(long months) {
1430 return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1431 }
1432
1433 /**
1434 * Returns a copy of this {@code OffsetDateTime} with the specified number of weeks subtracted.
1435 * <p>
1436 * This method subtracts the specified amount in weeks from the days field decrementing
1437 * the month and year fields as necessary to ensure the result remains valid.
1438 * The result is only invalid if the maximum/minimum year is exceeded.
1439 * <p>
1440 * For example, 2009-01-07 minus one week would result in 2008-12-31.
1441 * <p>
1442 * This instance is immutable and unaffected by this method call.
1443 *
1444 * @param weeks the weeks to subtract, may be negative
1445 * @return an {@code OffsetDateTime} based on this date-time with the weeks subtracted, not null
1446 * @throws DateTimeException if the result exceeds the supported date range
1447 */
1448 public OffsetDateTime minusWeeks(long weeks) {
1449 return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1450 }
1451
1452 /**
1453 * Returns a copy of this {@code OffsetDateTime} with the specified number of days subtracted.
1454 * <p>
1455 * This method subtracts the specified amount from the days field decrementing the
1456 * month and year fields as necessary to ensure the result remains valid.
1457 * The result is only invalid if the maximum/minimum year is exceeded.
1458 * <p>
1459 * For example, 2009-01-01 minus one day would result in 2008-12-31.
1460 * <p>
1461 * This instance is immutable and unaffected by this method call.
1462 *
1463 * @param days the days to subtract, may be negative
1464 * @return an {@code OffsetDateTime} based on this date-time with the days subtracted, not null
1465 * @throws DateTimeException if the result exceeds the supported date range
1466 */
1467 public OffsetDateTime minusDays(long days) {
1468 return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1469 }
1470
1471 /**
1472 * Returns a copy of this {@code OffsetDateTime} with the specified number of hours subtracted.
1473 * <p>
1474 * This instance is immutable and unaffected by this method call.
1475 *
1476 * @param hours the hours to subtract, may be negative
1477 * @return an {@code OffsetDateTime} based on this date-time with the hours subtracted, not null
1478 * @throws DateTimeException if the result exceeds the supported date range
1479 */
1480 public OffsetDateTime minusHours(long hours) {
1481 return (hours == Long.MIN_VALUE ? plusHours(Long.MAX_VALUE).plusHours(1) : plusHours(-hours));
1482 }
1483
1484 /**
1485 * Returns a copy of this {@code OffsetDateTime} with the specified number of minutes subtracted.
1486 * <p>
1487 * This instance is immutable and unaffected by this method call.
1488 *
1489 * @param minutes the minutes to subtract, may be negative
1490 * @return an {@code OffsetDateTime} based on this date-time with the minutes subtracted, not null
1491 * @throws DateTimeException if the result exceeds the supported date range
1492 */
1493 public OffsetDateTime minusMinutes(long minutes) {
1494 return (minutes == Long.MIN_VALUE ? plusMinutes(Long.MAX_VALUE).plusMinutes(1) : plusMinutes(-minutes));
1495 }
1496
1497 /**
1498 * Returns a copy of this {@code OffsetDateTime} with the specified number of seconds subtracted.
1499 * <p>
1500 * This instance is immutable and unaffected by this method call.
1501 *
1502 * @param seconds the seconds to subtract, may be negative
1503 * @return an {@code OffsetDateTime} based on this date-time with the seconds subtracted, not null
1504 * @throws DateTimeException if the result exceeds the supported date range
1505 */
1506 public OffsetDateTime minusSeconds(long seconds) {
1507 return (seconds == Long.MIN_VALUE ? plusSeconds(Long.MAX_VALUE).plusSeconds(1) : plusSeconds(-seconds));
1508 }
1509
1510 /**
1511 * Returns a copy of this {@code OffsetDateTime} with the specified number of nanoseconds subtracted.
1512 * <p>
1513 * This instance is immutable and unaffected by this method call.
1514 *
1515 * @param nanos the nanos to subtract, may be negative
1516 * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds subtracted, not null
1517 * @throws DateTimeException if the result exceeds the supported date range
1518 */
1519 public OffsetDateTime minusNanos(long nanos) {
1520 return (nanos == Long.MIN_VALUE ? plusNanos(Long.MAX_VALUE).plusNanos(1) : plusNanos(-nanos));
1521 }
1522
1523 //-----------------------------------------------------------------------
1524 /**
1525 * Queries this date-time using the specified query.
1526 * <p>
1527 * This queries this date-time using the specified query strategy object.
1528 * The {@code TemporalQuery} object defines the logic to be used to
1529 * obtain the result. Read the documentation of the query to understand
1530 * what the result of this method will be.
1531 * <p>
1532 * The result of this method is obtained by invoking the
1533 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
1534 * specified query passing {@code this} as the argument.
1535 *
1536 * @param <R> the type of the result
1537 * @param query the query to invoke, not null
1538 * @return the query result, null may be returned (defined by the query)
1539 * @throws DateTimeException if unable to query (defined by the query)
1540 * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1541 */
1542 @SuppressWarnings("unchecked")
1543 @Override
1544 public <R> R query(TemporalQuery<R> query) {
1545 if (query == TemporalQueries.offset() || query == TemporalQueries.zone()) {
1546 return (R) getOffset();
1547 } else if (query == TemporalQueries.zoneId()) {
1548 return null;
1549 } else if (query == TemporalQueries.localDate()) {
1550 return (R) toLocalDate();
1551 } else if (query == TemporalQueries.localTime()) {
1552 return (R) toLocalTime();
1553 } else if (query == TemporalQueries.chronology()) {
1554 return (R) IsoChronology.INSTANCE;
1555 } else if (query == TemporalQueries.precision()) {
1556 return (R) NANOS;
1557 }
1558 // inline TemporalAccessor.super.query(query) as an optimization
1559 // non-JDK classes are not permitted to make this optimization
1560 return query.queryFrom(this);
1561 }
1562
1563 /**
1564 * Adjusts the specified temporal object to have the same offset, date
1565 * and time as this object.
1566 * <p>
1567 * This returns a temporal object of the same observable type as the input
1568 * with the offset, date and time changed to be the same as this.
1569 * <p>
1570 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1571 * three times, passing {@link ChronoField#EPOCH_DAY},
1572 * {@link ChronoField#NANO_OF_DAY} and {@link ChronoField#OFFSET_SECONDS} as the fields.
1573 * <p>
1574 * In most cases, it is clearer to reverse the calling pattern by using
1575 * {@link Temporal#with(TemporalAdjuster)}:
1576 * <pre>
1577 * // these two lines are equivalent, but the second approach is recommended
1578 * temporal = thisOffsetDateTime.adjustInto(temporal);
1579 * temporal = temporal.with(thisOffsetDateTime);
1580 * </pre>
1581 * <p>
1582 * This instance is immutable and unaffected by this method call.
1583 *
1584 * @param temporal the target object to be adjusted, not null
1585 * @return the adjusted object, not null
1586 * @throws DateTimeException if unable to make the adjustment
1587 * @throws ArithmeticException if numeric overflow occurs
1588 */
1589 @Override
1590 public Temporal adjustInto(Temporal temporal) {
1591 // OffsetDateTime is treated as three separate fields, not an instant
1592 // this produces the most consistent set of results overall
1593 // the offset is set after the date and time, as it is typically a small
1594 // tweak to the result, with ZonedDateTime frequently ignoring the offset
1595 return temporal
1596 .with(EPOCH_DAY, toLocalDate().toEpochDay())
1597 .with(NANO_OF_DAY, toLocalTime().toNanoOfDay())
1598 .with(OFFSET_SECONDS, getOffset().getTotalSeconds());
1599 }
1600
1601 /**
1602 * Calculates the amount of time until another date-time in terms of the specified unit.
1603 * <p>
1604 * This calculates the amount of time between two {@code OffsetDateTime}
1605 * objects in terms of a single {@code TemporalUnit}.
1606 * The start and end points are {@code this} and the specified date-time.
1607 * The result will be negative if the end is before the start.
1608 * For example, the amount in days between two date-times can be calculated
1609 * using {@code startDateTime.until(endDateTime, DAYS)}.
1610 * <p>
1611 * The {@code Temporal} passed to this method is converted to a
1612 * {@code OffsetDateTime} using {@link #from(TemporalAccessor)}.
1613 * If the offset differs between the two date-times, the specified
1614 * end date-time is normalized to have the same offset as this date-time.
1615 * <p>
1616 * The calculation returns a whole number, representing the number of
1617 * complete units between the two date-times.
1618 * For example, the amount in months between 2012-06-15T00:00Z and 2012-08-14T23:59Z
1619 * will only be one month as it is one minute short of two months.
1620 * <p>
1621 * There are two equivalent ways of using this method.
1622 * The first is to invoke this method.
1623 * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
1624 * <pre>
1625 * // these two lines are equivalent
1626 * amount = start.until(end, MONTHS);
1627 * amount = MONTHS.between(start, end);
1628 * </pre>
1629 * The choice should be made based on which makes the code more readable.
1630 * <p>
1631 * The calculation is implemented in this method for {@link ChronoUnit}.
1632 * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1633 * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1634 * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1635 * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1636 * Other {@code ChronoUnit} values will throw an exception.
1637 * <p>
1638 * If the unit is not a {@code ChronoUnit}, then the result of this method
1639 * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1640 * passing {@code this} as the first argument and the converted input temporal
1641 * as the second argument.
1642 * <p>
1643 * This instance is immutable and unaffected by this method call.
1644 *
1645 * @param endExclusive the end date, exclusive, which is converted to an {@code OffsetDateTime}, not null
1646 * @param unit the unit to measure the amount in, not null
1647 * @return the amount of time between this date-time and the end date-time
1648 * @throws DateTimeException if the amount cannot be calculated, or the end
1649 * temporal cannot be converted to an {@code OffsetDateTime}
1650 * @throws UnsupportedTemporalTypeException if the unit is not supported
1651 * @throws ArithmeticException if numeric overflow occurs
1652 */
1653 @Override
1654 public long until(Temporal endExclusive, TemporalUnit unit) {
1655 OffsetDateTime end = OffsetDateTime.from(endExclusive);
1656 if (unit instanceof ChronoUnit) {
1657 end = end.withOffsetSameInstant(offset);
1658 return dateTime.until(end.dateTime, unit);
1659 }
1660 return unit.between(this, end);
1661 }
1662
1663 /**
1664 * Formats this date-time using the specified formatter.
1665 * <p>
1666 * This date-time will be passed to the formatter to produce a string.
1667 *
1668 * @param formatter the formatter to use, not null
1669 * @return the formatted date-time string, not null
1670 * @throws DateTimeException if an error occurs during printing
1671 */
1672 public String format(DateTimeFormatter formatter) {
1673 Objects.requireNonNull(formatter, "formatter");
1674 return formatter.format(this);
1675 }
1676
1677 //-----------------------------------------------------------------------
1678 /**
1679 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
1680 * ensuring that the result has the same instant.
1681 * <p>
1682 * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
1683 * This conversion will ignore the visible local date-time and use the underlying instant instead.
1684 * This avoids any problems with local time-line gaps or overlaps.
1685 * The result might have different values for fields such as hour, minute an even day.
1686 * <p>
1687 * To attempt to retain the values of the fields, use {@link #atZoneSimilarLocal(ZoneId)}.
1688 * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
1689 *
1690 * @param zone the time-zone to use, not null
1691 * @return the zoned date-time formed from this date-time, not null
1692 */
1693 public ZonedDateTime atZoneSameInstant(ZoneId zone) {
1694 return ZonedDateTime.ofInstant(dateTime, offset, zone);
1695 }
1696
1697 /**
1698 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
1699 * trying to keep the same local date and time.
1700 * <p>
1701 * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
1702 * Where possible, the result will have the same local date-time as this object.
1703 * <p>
1704 * Time-zone rules, such as daylight savings, mean that not every time on the
1705 * local time-line exists. If the local date-time is in a gap or overlap according to
1706 * the rules then a resolver is used to determine the resultant local time and offset.
1707 * This method uses {@link ZonedDateTime#ofLocal(LocalDateTime, ZoneId, ZoneOffset)}
1708 * to retain the offset from this instance if possible.
1709 * <p>
1710 * Finer control over gaps and overlaps is available in two ways.
1711 * If you simply want to use the later offset at overlaps then call
1712 * {@link ZonedDateTime#withLaterOffsetAtOverlap()} immediately after this method.
1713 * <p>
1714 * To create a zoned date-time at the same instant irrespective of the local time-line,
1715 * use {@link #atZoneSameInstant(ZoneId)}.
1716 * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
1717 *
1718 * @param zone the time-zone to use, not null
1719 * @return the zoned date-time formed from this date and the earliest valid time for the zone, not null
1720 */
1721 public ZonedDateTime atZoneSimilarLocal(ZoneId zone) {
1722 return ZonedDateTime.ofLocal(dateTime, zone, offset);
1723 }
1724
1725 //-----------------------------------------------------------------------
1726 /**
1727 * Converts this date-time to an {@code OffsetTime}.
1728 * <p>
1729 * This returns an offset time with the same local time and offset.
1730 *
1731 * @return an OffsetTime representing the time and offset, not null
1732 */
1733 public OffsetTime toOffsetTime() {
1734 return OffsetTime.of(dateTime.toLocalTime(), offset);
1735 }
1736
1737 /**
1738 * Converts this date-time to a {@code ZonedDateTime} using the offset as the zone ID.
1739 * <p>
1740 * This creates the simplest possible {@code ZonedDateTime} using the offset
1741 * as the zone ID.
1742 * <p>
1743 * To control the time-zone used, see {@link #atZoneSameInstant(ZoneId)} and
1744 * {@link #atZoneSimilarLocal(ZoneId)}.
1745 *
1746 * @return a zoned date-time representing the same local date-time and offset, not null
1747 */
1748 public ZonedDateTime toZonedDateTime() {
1749 return ZonedDateTime.of(dateTime, offset);
1750 }
1751
1752 /**
1753 * Converts this date-time to an {@code Instant}.
1754 * <p>
1755 * This returns an {@code Instant} representing the same point on the
1756 * time-line as this date-time.
1757 *
1758 * @return an {@code Instant} representing the same instant, not null
1759 */
1760 public Instant toInstant() {
1761 return dateTime.toInstant(offset);
1762 }
1763
1764 /**
1765 * Converts this date-time to the number of seconds from the epoch of 1970-01-01T00:00:00Z.
1766 * <p>
1767 * This allows this date-time to be converted to a value of the
1768 * {@link ChronoField#INSTANT_SECONDS epoch-seconds} field. This is primarily
1769 * intended for low-level conversions rather than general application usage.
1770 *
1771 * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z
1772 */
1773 public long toEpochSecond() {
1774 return dateTime.toEpochSecond(offset);
1775 }
1776
1777 //-----------------------------------------------------------------------
1778 /**
1779 * Compares this date-time to another date-time.
1780 * <p>
1781 * The comparison is based on the instant then on the local date-time.
1782 * It is "consistent with equals", as defined by {@link Comparable}.
1783 * <p>
1784 * For example, the following is the comparator order:
1785 * <ol>
1786 * <li>{@code 2008-12-03T10:30+01:00}</li>
1787 * <li>{@code 2008-12-03T11:00+01:00}</li>
1788 * <li>{@code 2008-12-03T12:00+02:00}</li>
1789 * <li>{@code 2008-12-03T11:30+01:00}</li>
1790 * <li>{@code 2008-12-03T12:00+01:00}</li>
1791 * <li>{@code 2008-12-03T12:30+01:00}</li>
1792 * </ol>
1793 * Values #2 and #3 represent the same instant on the time-line.
1794 * When two values represent the same instant, the local date-time is compared
1795 * to distinguish them. This step is needed to make the ordering
1796 * consistent with {@code equals()}.
1797 *
1798 * @param other the other date-time to compare to, not null
1799 * @return the comparator value, negative if less, positive if greater
1800 */
1801 @Override
1802 public int compareTo(OffsetDateTime other) {
1803 int cmp = compareInstant(this, other);
1804 if (cmp == 0) {
1805 cmp = toLocalDateTime().compareTo(other.toLocalDateTime());
1806 }
1807 return cmp;
1808 }
1809
1810 //-----------------------------------------------------------------------
1811 /**
1812 * Checks if the instant of this date-time is after that of the specified date-time.
1813 * <p>
1814 * This method differs from the comparison in {@link #compareTo} and {@link #equals} in that it
1815 * only compares the instant of the date-time. This is equivalent to using
1816 * {@code dateTime1.toInstant().isAfter(dateTime2.toInstant());}.
1817 *
1818 * @param other the other date-time to compare to, not null
1819 * @return true if this is after the instant of the specified date-time
1820 */
1821 public boolean isAfter(OffsetDateTime other) {
1822 long thisEpochSec = toEpochSecond();
1823 long otherEpochSec = other.toEpochSecond();
1824 return thisEpochSec > otherEpochSec ||
1825 (thisEpochSec == otherEpochSec && toLocalTime().getNano() > other.toLocalTime().getNano());
1826 }
1827
1828 /**
1829 * Checks if the instant of this date-time is before that of the specified date-time.
1830 * <p>
1831 * This method differs from the comparison in {@link #compareTo} in that it
1832 * only compares the instant of the date-time. This is equivalent to using
1833 * {@code dateTime1.toInstant().isBefore(dateTime2.toInstant());}.
1834 *
1835 * @param other the other date-time to compare to, not null
1836 * @return true if this is before the instant of the specified date-time
1837 */
1838 public boolean isBefore(OffsetDateTime other) {
1839 long thisEpochSec = toEpochSecond();
1840 long otherEpochSec = other.toEpochSecond();
1841 return thisEpochSec < otherEpochSec ||
1842 (thisEpochSec == otherEpochSec && toLocalTime().getNano() < other.toLocalTime().getNano());
1843 }
1844
1845 /**
1846 * Checks if the instant of this date-time is equal to that of the specified date-time.
1847 * <p>
1848 * This method differs from the comparison in {@link #compareTo} and {@link #equals}
1849 * in that it only compares the instant of the date-time. This is equivalent to using
1850 * {@code dateTime1.toInstant().equals(dateTime2.toInstant());}.
1851 *
1852 * @param other the other date-time to compare to, not null
1853 * @return true if the instant equals the instant of the specified date-time
1854 */
1855 public boolean isEqual(OffsetDateTime other) {
1856 return toEpochSecond() == other.toEpochSecond() &&
1857 toLocalTime().getNano() == other.toLocalTime().getNano();
1858 }
1859
1860 //-----------------------------------------------------------------------
1861 /**
1862 * Checks if this date-time is equal to another date-time.
1863 * <p>
1864 * The comparison is based on the local date-time and the offset.
1865 * To compare for the same instant on the time-line, use {@link #isEqual}.
1866 * Only objects of type {@code OffsetDateTime} are compared, other types return false.
1867 *
1868 * @param obj the object to check, null returns false
1869 * @return true if this is equal to the other date-time
1870 */
1871 @Override
1872 public boolean equals(Object obj) {
1873 if (this == obj) {
1874 return true;
1875 }
1876 if (obj instanceof OffsetDateTime) {
1877 OffsetDateTime other = (OffsetDateTime) obj;
1878 return dateTime.equals(other.dateTime) && offset.equals(other.offset);
1879 }
1880 return false;
1881 }
1882
1883 /**
1884 * A hash code for this date-time.
1885 *
1886 * @return a suitable hash code
1887 */
1888 @Override
1889 public int hashCode() {
1890 return dateTime.hashCode() ^ offset.hashCode();
1891 }
1892
1893 //-----------------------------------------------------------------------
1894 /**
1895 * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30+01:00}.
1896 * <p>
1897 * The output will be one of the following ISO-8601 formats:
1898 * <ul>
1899 * <li>{@code uuuu-MM-dd'T'HH:mmXXXXX}</li>
1900 * <li>{@code uuuu-MM-dd'T'HH:mm:ssXXXXX}</li>
1901 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSXXXXX}</li>
1902 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSXXXXX}</li>
1903 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSSXXXXX}</li>
1904 * </ul>
1905 * The format used will be the shortest that outputs the full value of
1906 * the time where the omitted parts are implied to be zero.
1907 *
1908 * @return a string representation of this date-time, not null
1909 */
1910 @Override
1911 public String toString() {
1912 return dateTime.toString() + offset.toString();
1913 }
1914
1915 //-----------------------------------------------------------------------
1916 /**
1917 * Writes the object using a
1918 * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1919 * @serialData
1920 * <pre>
1921 * out.writeByte(10); // identifies an OffsetDateTime
1922 * // the <a href="../../serialized-form.html#java.time.LocalDateTime">datetime</a> excluding the one byte header
1923 * // the <a href="../../serialized-form.html#java.time.ZoneOffset">offset</a> excluding the one byte header
1924 * </pre>
1925 *
1926 * @return the instance of {@code Ser}, not null
1927 */
1928 private Object writeReplace() {
1929 return new Ser(Ser.OFFSET_DATE_TIME_TYPE, this);
1930 }
1931
1932 /**
1933 * Defend against malicious streams.
1934 *
1935 * @param s the stream to read
1936 * @throws InvalidObjectException always
1937 */
1938 private void readObject(ObjectInputStream s) throws InvalidObjectException {
1939 throw new InvalidObjectException("Deserialization via serialization delegate");
1940 }
1941
1942 void writeExternal(ObjectOutput out) throws IOException {
1943 dateTime.writeExternal(out);
1944 offset.writeExternal(out);
1945 }
1946
1947 static OffsetDateTime readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
1948 LocalDateTime dateTime = LocalDateTime.readExternal(in);
1949 ZoneOffset offset = ZoneOffset.readExternal(in);
1950 return OffsetDateTime.of(dateTime, offset);
1951 }
1952
1953 }
1954