1 /*
2 * Copyright (c) 2012, 2024, 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 * <p>
116 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
117 * class; programmers should treat instances that are
118 * {@linkplain #equals(Object) equal} as interchangeable and should not
119 * use instances for synchronization, or unpredictable behavior may
120 * occur. For example, in a future release, synchronization may fail.
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 @jdk.internal.ValueBased
129 @jdk.internal.MigratedValueClass
130 public final class OffsetDateTime
131 implements Temporal, TemporalAdjuster, Comparable<OffsetDateTime>, Serializable {
132
133 /**
134 * The minimum supported {@code OffsetDateTime}, '-999999999-01-01T00:00:00+18:00'.
135 * This is the local date-time of midnight at the start of the minimum date
136 * in the maximum offset (larger offsets are earlier on the time-line).
137 * This combines {@link LocalDateTime#MIN} and {@link ZoneOffset#MAX}.
138 * This could be used by an application as a "far past" date-time.
139 */
140 public static final OffsetDateTime MIN = LocalDateTime.MIN.atOffset(ZoneOffset.MAX);
141 /**
142 * The maximum supported {@code OffsetDateTime}, '+999999999-12-31T23:59:59.999999999-18:00'.
143 * This is the local date-time just before midnight at the end of the maximum date
144 * in the minimum offset (larger negative offsets are later on the time-line).
145 * This combines {@link LocalDateTime#MAX} and {@link ZoneOffset#MIN}.
146 * This could be used by an application as a "far future" date-time.
147 */
148 public static final OffsetDateTime MAX = LocalDateTime.MAX.atOffset(ZoneOffset.MIN);
149
150 /**
151 * Gets a comparator that compares two {@code OffsetDateTime} instances
152 * based solely on the instant.
153 * <p>
154 * This method differs from the comparison in {@link #compareTo} in that it
155 * only compares the underlying instant.
156 *
157 * @return a comparator that compares in time-line order
158 *
159 * @see #isAfter
160 * @see #isBefore
161 * @see #isEqual
162 */
163 public static Comparator<OffsetDateTime> timeLineOrder() {
164 return OffsetDateTime::compareInstant;
165 }
166
167 /**
168 * Compares this {@code OffsetDateTime} to another date-time.
169 * The comparison is based on the instant.
170 *
171 * @param datetime1 the first date-time to compare, not null
172 * @param datetime2 the other date-time to compare to, not null
173 * @return the comparator value, that is less than zero if {@code datetime1} is before {@code datetime2},
174 * zero if they are equal, greater than zero if {@code datetime1} is after {@code datetime2}
175 */
176 private static int compareInstant(OffsetDateTime datetime1, OffsetDateTime datetime2) {
177 if (datetime1.getOffset().equals(datetime2.getOffset())) {
178 return datetime1.toLocalDateTime().compareTo(datetime2.toLocalDateTime());
179 }
180 int cmp = Long.compare(datetime1.toEpochSecond(), datetime2.toEpochSecond());
181 if (cmp == 0) {
182 cmp = datetime1.toLocalTime().getNano() - datetime2.toLocalTime().getNano();
183 }
184 return cmp;
185 }
186
187 /**
188 * Serialization version.
189 */
190 @java.io.Serial
191 private static final long serialVersionUID = 2287754244819255394L;
192
193 /**
194 * The local date-time.
195 */
196 private final LocalDateTime dateTime;
197 /**
198 * The offset from UTC/Greenwich.
199 */
200 private final ZoneOffset offset;
201
202 //-----------------------------------------------------------------------
203 /**
204 * Obtains the current date-time from the system clock in the default time-zone.
205 * <p>
206 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
207 * time-zone to obtain the current date-time.
208 * The offset will be calculated from the time-zone in the clock.
209 * <p>
210 * Using this method will prevent the ability to use an alternate clock for testing
211 * because the clock is hard-coded.
212 *
213 * @return the current date-time using the system clock, not null
214 */
215 public static OffsetDateTime now() {
216 return now(Clock.systemDefaultZone());
217 }
218
219 /**
220 * Obtains the current date-time from the system clock in the specified time-zone.
221 * <p>
222 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
223 * Specifying the time-zone avoids dependence on the default time-zone.
224 * The offset will be calculated from the specified time-zone.
225 * <p>
226 * Using this method will prevent the ability to use an alternate clock for testing
227 * because the clock is hard-coded.
228 *
229 * @param zone the zone ID to use, not null
230 * @return the current date-time using the system clock, not null
231 */
232 public static OffsetDateTime now(ZoneId zone) {
233 return now(Clock.system(zone));
234 }
235
236 /**
237 * Obtains the current date-time from the specified clock.
238 * <p>
239 * This will query the specified clock to obtain the current date-time.
240 * The offset will be calculated from the time-zone in the clock.
241 * <p>
242 * Using this method allows the use of an alternate clock for testing.
243 * The alternate clock may be introduced using {@link Clock dependency injection}.
244 *
245 * @param clock the clock to use, not null
246 * @return the current date-time, not null
247 */
248 public static OffsetDateTime now(Clock clock) {
249 Objects.requireNonNull(clock, "clock");
250 final Instant now = clock.instant(); // called once
251 return ofInstant(now, clock.getZone().getRules().getOffset(now));
252 }
253
254 //-----------------------------------------------------------------------
255 /**
256 * Obtains an instance of {@code OffsetDateTime} from a date, time and offset.
257 * <p>
258 * This creates an offset date-time with the specified local date, time and offset.
259 *
260 * @param date the local date, not null
261 * @param time the local time, not null
262 * @param offset the zone offset, not null
263 * @return the offset date-time, not null
264 */
265 public static OffsetDateTime of(LocalDate date, LocalTime time, ZoneOffset offset) {
266 LocalDateTime dt = LocalDateTime.of(date, time);
267 return new OffsetDateTime(dt, offset);
268 }
269
270 /**
271 * Obtains an instance of {@code OffsetDateTime} from a date-time and offset.
272 * <p>
273 * This creates an offset date-time with the specified local date-time and offset.
274 *
275 * @param dateTime the local date-time, not null
276 * @param offset the zone offset, not null
277 * @return the offset date-time, not null
278 */
279 public static OffsetDateTime of(LocalDateTime dateTime, ZoneOffset offset) {
280 return new OffsetDateTime(dateTime, offset);
281 }
282
283 /**
284 * Obtains an instance of {@code OffsetDateTime} from a year, month, day,
285 * hour, minute, second, nanosecond and offset.
286 * <p>
287 * This creates an offset date-time with the seven specified fields.
288 * <p>
289 * This method exists primarily for writing test cases.
290 * Non test-code will typically use other methods to create an offset time.
291 * {@code LocalDateTime} has five additional convenience variants of the
292 * equivalent factory method taking fewer arguments.
293 * They are not provided here to reduce the footprint of the API.
294 *
295 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
296 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
297 * @param dayOfMonth the day-of-month to represent, from 1 to 31
298 * @param hour the hour-of-day to represent, from 0 to 23
299 * @param minute the minute-of-hour to represent, from 0 to 59
300 * @param second the second-of-minute to represent, from 0 to 59
301 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
302 * @param offset the zone offset, not null
303 * @return the offset date-time, not null
304 * @throws DateTimeException if the value of any field is out of range, or
305 * if the day-of-month is invalid for the month-year
306 */
307 public static OffsetDateTime of(
308 int year, int month, int dayOfMonth,
309 int hour, int minute, int second, int nanoOfSecond, ZoneOffset offset) {
310 LocalDateTime dt = LocalDateTime.of(year, month, dayOfMonth, hour, minute, second, nanoOfSecond);
311 return new OffsetDateTime(dt, offset);
312 }
313
314 //-----------------------------------------------------------------------
315 /**
316 * Obtains an instance of {@code OffsetDateTime} from an {@code Instant} and zone ID.
317 * <p>
318 * This creates an offset date-time with the same instant as that specified.
319 * Finding the offset from UTC/Greenwich is simple as there is only one valid
320 * offset for each instant.
321 *
322 * @param instant the instant to create the date-time from, not null
323 * @param zone the time-zone, which may be an offset, not null
324 * @return the offset date-time, not null
325 * @throws DateTimeException if the result exceeds the supported range
326 */
327 public static OffsetDateTime ofInstant(Instant instant, ZoneId zone) {
328 Objects.requireNonNull(instant, "instant");
329 Objects.requireNonNull(zone, "zone");
330 ZoneRules rules = zone.getRules();
331 ZoneOffset offset = rules.getOffset(instant);
332 LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
333 return new OffsetDateTime(ldt, offset);
334 }
335
336 //-----------------------------------------------------------------------
337 /**
338 * Obtains an instance of {@code OffsetDateTime} from a temporal object.
339 * <p>
340 * This obtains an offset date-time based on the specified temporal.
341 * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
342 * which this factory converts to an instance of {@code OffsetDateTime}.
343 * <p>
344 * The conversion will first obtain a {@code ZoneOffset} from the temporal object.
345 * It will then try to obtain a {@code LocalDateTime}, falling back to an {@code Instant} if necessary.
346 * The result will be the combination of {@code ZoneOffset} with either
347 * with {@code LocalDateTime} or {@code Instant}.
348 * Implementations are permitted to perform optimizations such as accessing
349 * those fields that are equivalent to the relevant objects.
350 * <p>
351 * This method matches the signature of the functional interface {@link TemporalQuery}
352 * allowing it to be used as a query via method reference, {@code OffsetDateTime::from}.
353 *
354 * @param temporal the temporal object to convert, not null
355 * @return the offset date-time, not null
356 * @throws DateTimeException if unable to convert to an {@code OffsetDateTime}
357 */
358 public static OffsetDateTime from(TemporalAccessor temporal) {
359 if (temporal instanceof OffsetDateTime) {
360 return (OffsetDateTime) temporal;
361 }
362 try {
363 ZoneOffset offset = ZoneOffset.from(temporal);
364 LocalDate date = temporal.query(TemporalQueries.localDate());
365 LocalTime time = temporal.query(TemporalQueries.localTime());
366 if (date != null && time != null) {
367 return OffsetDateTime.of(date, time, offset);
368 } else {
369 Instant instant = Instant.from(temporal);
370 return OffsetDateTime.ofInstant(instant, offset);
371 }
372 } catch (DateTimeException ex) {
373 throw new DateTimeException("Unable to obtain OffsetDateTime from TemporalAccessor: " +
374 temporal + " of type " + temporal.getClass().getName(), ex);
375 }
376 }
377
378 //-----------------------------------------------------------------------
379 /**
380 * Obtains an instance of {@code OffsetDateTime} from a text string
381 * such as {@code 2007-12-03T10:15:30+01:00}.
382 * <p>
383 * The string must represent a valid date-time and is parsed using
384 * {@link java.time.format.DateTimeFormatter#ISO_OFFSET_DATE_TIME}.
385 *
386 * @param text the text to parse such as "2007-12-03T10:15:30+01:00", not null
387 * @return the parsed offset date-time, not null
388 * @throws DateTimeParseException if the text cannot be parsed
389 */
390 public static OffsetDateTime parse(CharSequence text) {
391 return parse(text, DateTimeFormatter.ISO_OFFSET_DATE_TIME);
392 }
393
394 /**
395 * Obtains an instance of {@code OffsetDateTime} from a text string using a specific formatter.
396 * <p>
397 * The text is parsed using the formatter, returning a date-time.
398 *
399 * @param text the text to parse, not null
400 * @param formatter the formatter to use, not null
401 * @return the parsed offset date-time, not null
402 * @throws DateTimeParseException if the text cannot be parsed
403 */
404 public static OffsetDateTime parse(CharSequence text, DateTimeFormatter formatter) {
405 Objects.requireNonNull(formatter, "formatter");
406 return formatter.parse(text, OffsetDateTime::from);
407 }
408
409 //-----------------------------------------------------------------------
410 /**
411 * Constructor.
412 *
413 * @param dateTime the local date-time, not null
414 * @param offset the zone offset, not null
415 */
416 private OffsetDateTime(LocalDateTime dateTime, ZoneOffset offset) {
417 this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
418 this.offset = Objects.requireNonNull(offset, "offset");
419 }
420
421 /**
422 * Returns a new date-time based on this one, returning {@code this} where possible.
423 *
424 * @param dateTime the date-time to create with, not null
425 * @param offset the zone offset to create with, not null
426 */
427 private OffsetDateTime with(LocalDateTime dateTime, ZoneOffset offset) {
428 if (this.dateTime == dateTime && this.offset.equals(offset)) {
429 return this;
430 }
431 return new OffsetDateTime(dateTime, offset);
432 }
433
434 //-----------------------------------------------------------------------
435 /**
436 * Checks if the specified field is supported.
437 * <p>
438 * This checks if this date-time can be queried for the specified field.
439 * If false, then calling the {@link #range(TemporalField) range},
440 * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
441 * methods will throw an exception.
442 * <p>
443 * If the field is a {@link ChronoField} then the query is implemented here.
444 * The supported fields are:
445 * <ul>
446 * <li>{@code NANO_OF_SECOND}
447 * <li>{@code NANO_OF_DAY}
448 * <li>{@code MICRO_OF_SECOND}
449 * <li>{@code MICRO_OF_DAY}
450 * <li>{@code MILLI_OF_SECOND}
451 * <li>{@code MILLI_OF_DAY}
452 * <li>{@code SECOND_OF_MINUTE}
453 * <li>{@code SECOND_OF_DAY}
454 * <li>{@code MINUTE_OF_HOUR}
455 * <li>{@code MINUTE_OF_DAY}
456 * <li>{@code HOUR_OF_AMPM}
457 * <li>{@code CLOCK_HOUR_OF_AMPM}
458 * <li>{@code HOUR_OF_DAY}
459 * <li>{@code CLOCK_HOUR_OF_DAY}
460 * <li>{@code AMPM_OF_DAY}
461 * <li>{@code DAY_OF_WEEK}
462 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
463 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
464 * <li>{@code DAY_OF_MONTH}
465 * <li>{@code DAY_OF_YEAR}
466 * <li>{@code EPOCH_DAY}
467 * <li>{@code ALIGNED_WEEK_OF_MONTH}
468 * <li>{@code ALIGNED_WEEK_OF_YEAR}
469 * <li>{@code MONTH_OF_YEAR}
470 * <li>{@code PROLEPTIC_MONTH}
471 * <li>{@code YEAR_OF_ERA}
472 * <li>{@code YEAR}
473 * <li>{@code ERA}
474 * <li>{@code INSTANT_SECONDS}
475 * <li>{@code OFFSET_SECONDS}
476 * </ul>
477 * All other {@code ChronoField} instances will return false.
478 * <p>
479 * If the field is not a {@code ChronoField}, then the result of this method
480 * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
481 * passing {@code this} as the argument.
482 * Whether the field is supported is determined by the field.
483 *
484 * @param field the field to check, null returns false
485 * @return true if the field is supported on this date-time, false if not
486 */
487 @Override
488 public boolean isSupported(TemporalField field) {
489 return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
490 }
491
492 /**
493 * Checks if the specified unit is supported.
494 * <p>
495 * This checks if the specified unit can be added to, or subtracted from, this date-time.
496 * If false, then calling the {@link #plus(long, TemporalUnit)} and
497 * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
498 * <p>
499 * If the unit is a {@link ChronoUnit} then the query is implemented here.
500 * The supported units are:
501 * <ul>
502 * <li>{@code NANOS}
503 * <li>{@code MICROS}
504 * <li>{@code MILLIS}
505 * <li>{@code SECONDS}
506 * <li>{@code MINUTES}
507 * <li>{@code HOURS}
508 * <li>{@code HALF_DAYS}
509 * <li>{@code DAYS}
510 * <li>{@code WEEKS}
511 * <li>{@code MONTHS}
512 * <li>{@code YEARS}
513 * <li>{@code DECADES}
514 * <li>{@code CENTURIES}
515 * <li>{@code MILLENNIA}
516 * <li>{@code ERAS}
517 * </ul>
518 * All other {@code ChronoUnit} instances will return false.
519 * <p>
520 * If the unit is not a {@code ChronoUnit}, then the result of this method
521 * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
522 * passing {@code this} as the argument.
523 * Whether the unit is supported is determined by the unit.
524 *
525 * @param unit the unit to check, null returns false
526 * @return true if the unit can be added/subtracted, false if not
527 */
528 @Override // override for Javadoc
529 public boolean isSupported(TemporalUnit unit) {
530 if (unit instanceof ChronoUnit) {
531 return unit != FOREVER;
532 }
533 return unit != null && unit.isSupportedBy(this);
534 }
535
536 //-----------------------------------------------------------------------
537 /**
538 * Gets the range of valid values for the specified field.
539 * <p>
540 * The range object expresses the minimum and maximum valid values for a field.
541 * This date-time is used to enhance the accuracy of the returned range.
542 * If it is not possible to return the range, because the field is not supported
543 * or for some other reason, an exception is thrown.
544 * <p>
545 * If the field is a {@link ChronoField} then the query is implemented here.
546 * The {@link #isSupported(TemporalField) supported fields} will return
547 * appropriate range instances.
548 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
549 * <p>
550 * If the field is not a {@code ChronoField}, then the result of this method
551 * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
552 * passing {@code this} as the argument.
553 * Whether the range can be obtained is determined by the field.
554 *
555 * @param field the field to query the range for, not null
556 * @return the range of valid values for the field, not null
557 * @throws DateTimeException if the range for the field cannot be obtained
558 * @throws UnsupportedTemporalTypeException if the field is not supported
559 */
560 @Override
561 public ValueRange range(TemporalField field) {
562 if (field instanceof ChronoField) {
563 if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {
564 return field.range();
565 }
566 return dateTime.range(field);
567 }
568 return field.rangeRefinedBy(this);
569 }
570
571 /**
572 * Gets the value of the specified field from this date-time as an {@code int}.
573 * <p>
574 * This queries this date-time for the value of the specified field.
575 * The returned value will always be within the valid range of values for the field.
576 * If it is not possible to return the value, because the field is not supported
577 * or for some other reason, an exception is thrown.
578 * <p>
579 * If the field is a {@link ChronoField} then the query is implemented here.
580 * The {@link #isSupported(TemporalField) supported fields} will return valid
581 * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
582 * {@code EPOCH_DAY}, {@code PROLEPTIC_MONTH} and {@code INSTANT_SECONDS} which are too
583 * large to fit in an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
584 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
585 * <p>
586 * If the field is not a {@code ChronoField}, then the result of this method
587 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
588 * passing {@code this} as the argument. Whether the value can be obtained,
589 * and what the value represents, is determined by the field.
590 *
591 * @param field the field to get, not null
592 * @return the value for the field
593 * @throws DateTimeException if a value for the field cannot be obtained or
594 * the value is outside the range of valid values for the field
595 * @throws UnsupportedTemporalTypeException if the field is not supported or
596 * the range of values exceeds an {@code int}
597 * @throws ArithmeticException if numeric overflow occurs
598 */
599 @Override
600 public int get(TemporalField field) {
601 if (field instanceof ChronoField chronoField) {
602 return switch (chronoField) {
603 case INSTANT_SECONDS -> throw new UnsupportedTemporalTypeException("Invalid field " +
604 "'InstantSeconds' for get() method, use getLong() instead");
605 case OFFSET_SECONDS -> getOffset().getTotalSeconds();
606 default -> dateTime.get(field);
607 };
608 }
609 return Temporal.super.get(field);
610 }
611
612 /**
613 * Gets the value of the specified field from this date-time as a {@code long}.
614 * <p>
615 * This queries this date-time for the value of the specified field.
616 * If it is not possible to return the value, because the field is not supported
617 * or for some other reason, an exception is thrown.
618 * <p>
619 * If the field is a {@link ChronoField} then the query is implemented here.
620 * The {@link #isSupported(TemporalField) supported fields} will return valid
621 * values based on this date-time.
622 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
623 * <p>
624 * If the field is not a {@code ChronoField}, then the result of this method
625 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
626 * passing {@code this} as the argument. Whether the value can be obtained,
627 * and what the value represents, is determined by the field.
628 *
629 * @param field the field to get, not null
630 * @return the value for the field
631 * @throws DateTimeException if a value for the field cannot be obtained
632 * @throws UnsupportedTemporalTypeException if the field is not supported
633 * @throws ArithmeticException if numeric overflow occurs
634 */
635 @Override
636 public long getLong(TemporalField field) {
637 if (field instanceof ChronoField chronoField) {
638 return switch (chronoField) {
639 case INSTANT_SECONDS -> toEpochSecond();
640 case OFFSET_SECONDS -> getOffset().getTotalSeconds();
641 default -> dateTime.getLong(field);
642 };
643 }
644 return field.getFrom(this);
645 }
646
647 //-----------------------------------------------------------------------
648 /**
649 * Gets the zone offset, such as '+01:00'.
650 * <p>
651 * This is the offset of the local date-time from UTC/Greenwich.
652 *
653 * @return the zone offset, not null
654 */
655 public ZoneOffset getOffset() {
656 return offset;
657 }
658
659 /**
660 * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
661 * that the result has the same local date-time.
662 * <p>
663 * This method returns an object with the same {@code LocalDateTime} and the specified {@code ZoneOffset}.
664 * No calculation is needed or performed.
665 * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
666 * {@code +03:00}, then this method will return {@code 2007-12-03T10:30+03:00}.
667 * <p>
668 * To take into account the difference between the offsets, and adjust the time fields,
669 * use {@link #withOffsetSameInstant}.
670 * <p>
671 * This instance is immutable and unaffected by this method call.
672 *
673 * @param offset the zone offset to change to, not null
674 * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
675 */
676 public OffsetDateTime withOffsetSameLocal(ZoneOffset offset) {
677 return with(dateTime, offset);
678 }
679
680 /**
681 * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
682 * that the result is at the same instant.
683 * <p>
684 * This method returns an object with the specified {@code ZoneOffset} and a {@code LocalDateTime}
685 * adjusted by the difference between the two offsets.
686 * This will result in the old and new objects representing the same instant.
687 * This is useful for finding the local time in a different offset.
688 * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
689 * {@code +03:00}, then this method will return {@code 2007-12-03T11:30+03:00}.
690 * <p>
691 * To change the offset without adjusting the local time use {@link #withOffsetSameLocal}.
692 * <p>
693 * This instance is immutable and unaffected by this method call.
694 *
695 * @param offset the zone offset to change to, not null
696 * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
697 * @throws DateTimeException if the result exceeds the supported date range
698 */
699 public OffsetDateTime withOffsetSameInstant(ZoneOffset offset) {
700 if (offset.equals(this.offset)) {
701 return this;
702 }
703 int difference = offset.getTotalSeconds() - this.offset.getTotalSeconds();
704 LocalDateTime adjusted = dateTime.plusSeconds(difference);
705 return new OffsetDateTime(adjusted, offset);
706 }
707
708 //-----------------------------------------------------------------------
709 /**
710 * Gets the {@code LocalDateTime} part of this date-time.
711 * <p>
712 * This returns a {@code LocalDateTime} with the same year, month, day and time
713 * as this date-time.
714 *
715 * @return the local date-time part of this date-time, not null
716 */
717 public LocalDateTime toLocalDateTime() {
718 return dateTime;
719 }
720
721 //-----------------------------------------------------------------------
722 /**
723 * Gets the {@code LocalDate} part of this date-time.
724 * <p>
725 * This returns a {@code LocalDate} with the same year, month and day
726 * as this date-time.
727 *
728 * @return the date part of this date-time, not null
729 */
730 public LocalDate toLocalDate() {
731 return dateTime.toLocalDate();
732 }
733
734 /**
735 * Gets the year field.
736 * <p>
737 * This method returns the primitive {@code int} value for the year.
738 * <p>
739 * The year returned by this method is proleptic as per {@code get(YEAR)}.
740 * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
741 *
742 * @return the year, from MIN_YEAR to MAX_YEAR
743 */
744 public int getYear() {
745 return dateTime.getYear();
746 }
747
748 /**
749 * Gets the month-of-year field from 1 to 12.
750 * <p>
751 * This method returns the month as an {@code int} from 1 to 12.
752 * Application code is frequently clearer if the enum {@link Month}
753 * is used by calling {@link #getMonth()}.
754 *
755 * @return the month-of-year, from 1 to 12
756 * @see #getMonth()
757 */
758 public int getMonthValue() {
759 return dateTime.getMonthValue();
760 }
761
762 /**
763 * Gets the month-of-year field using the {@code Month} enum.
764 * <p>
765 * This method returns the enum {@link Month} for the month.
766 * This avoids confusion as to what {@code int} values mean.
767 * If you need access to the primitive {@code int} value then the enum
768 * provides the {@link Month#getValue() int value}.
769 *
770 * @return the month-of-year, not null
771 * @see #getMonthValue()
772 */
773 public Month getMonth() {
774 return dateTime.getMonth();
775 }
776
777 /**
778 * Gets the day-of-month field.
779 * <p>
780 * This method returns the primitive {@code int} value for the day-of-month.
781 *
782 * @return the day-of-month, from 1 to 31
783 */
784 public int getDayOfMonth() {
785 return dateTime.getDayOfMonth();
786 }
787
788 /**
789 * Gets the day-of-year field.
790 * <p>
791 * This method returns the primitive {@code int} value for the day-of-year.
792 *
793 * @return the day-of-year, from 1 to 365, or 366 in a leap year
794 */
795 public int getDayOfYear() {
796 return dateTime.getDayOfYear();
797 }
798
799 /**
800 * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
801 * <p>
802 * This method returns the enum {@link DayOfWeek} for the day-of-week.
803 * This avoids confusion as to what {@code int} values mean.
804 * If you need access to the primitive {@code int} value then the enum
805 * provides the {@link DayOfWeek#getValue() int value}.
806 * <p>
807 * Additional information can be obtained from the {@code DayOfWeek}.
808 * This includes textual names of the values.
809 *
810 * @return the day-of-week, not null
811 */
812 public DayOfWeek getDayOfWeek() {
813 return dateTime.getDayOfWeek();
814 }
815
816 //-----------------------------------------------------------------------
817 /**
818 * Gets the {@code LocalTime} part of this date-time.
819 * <p>
820 * This returns a {@code LocalTime} with the same hour, minute, second and
821 * nanosecond as this date-time.
822 *
823 * @return the time part of this date-time, not null
824 */
825 public LocalTime toLocalTime() {
826 return dateTime.toLocalTime();
827 }
828
829 /**
830 * Gets the hour-of-day field.
831 *
832 * @return the hour-of-day, from 0 to 23
833 */
834 public int getHour() {
835 return dateTime.getHour();
836 }
837
838 /**
839 * Gets the minute-of-hour field.
840 *
841 * @return the minute-of-hour, from 0 to 59
842 */
843 public int getMinute() {
844 return dateTime.getMinute();
845 }
846
847 /**
848 * Gets the second-of-minute field.
849 *
850 * @return the second-of-minute, from 0 to 59
851 */
852 public int getSecond() {
853 return dateTime.getSecond();
854 }
855
856 /**
857 * Gets the nano-of-second field.
858 *
859 * @return the nano-of-second, from 0 to 999,999,999
860 */
861 public int getNano() {
862 return dateTime.getNano();
863 }
864
865 //-----------------------------------------------------------------------
866 /**
867 * Returns an adjusted copy of this date-time.
868 * <p>
869 * This returns an {@code OffsetDateTime}, based on this one, with the date-time adjusted.
870 * The adjustment takes place using the specified adjuster strategy object.
871 * Read the documentation of the adjuster to understand what adjustment will be made.
872 * <p>
873 * A simple adjuster might simply set the one of the fields, such as the year field.
874 * A more complex adjuster might set the date to the last day of the month.
875 * A selection of common adjustments is provided in
876 * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
877 * These include finding the "last day of the month" and "next Wednesday".
878 * Key date-time classes also implement the {@code TemporalAdjuster} interface,
879 * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
880 * The adjuster is responsible for handling special cases, such as the varying
881 * lengths of month and leap years.
882 * <p>
883 * For example this code returns a date on the last day of July:
884 * <pre>
885 * import static java.time.Month.*;
886 * import static java.time.temporal.TemporalAdjusters.*;
887 *
888 * result = offsetDateTime.with(JULY).with(lastDayOfMonth());
889 * </pre>
890 * <p>
891 * The classes {@link LocalDate}, {@link LocalTime} and {@link ZoneOffset} implement
892 * {@code TemporalAdjuster}, thus this method can be used to change the date, time or offset:
893 * <pre>
894 * result = offsetDateTime.with(date);
895 * result = offsetDateTime.with(time);
896 * result = offsetDateTime.with(offset);
897 * </pre>
898 * <p>
899 * The result of this method is obtained by invoking the
900 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
901 * specified adjuster passing {@code this} as the argument.
902 * <p>
903 * This instance is immutable and unaffected by this method call.
904 *
905 * @param adjuster the adjuster to use, not null
906 * @return an {@code OffsetDateTime} based on {@code this} with the adjustment made, not null
907 * @throws DateTimeException if the adjustment cannot be made
908 * @throws ArithmeticException if numeric overflow occurs
909 */
910 @Override
911 public OffsetDateTime with(TemporalAdjuster adjuster) {
912 // optimizations
913 if (adjuster instanceof LocalDate || adjuster instanceof LocalTime || adjuster instanceof LocalDateTime) {
914 return with(dateTime.with(adjuster), offset);
915 } else if (adjuster instanceof Instant) {
916 return ofInstant((Instant) adjuster, offset);
917 } else if (adjuster instanceof ZoneOffset) {
918 return with(dateTime, (ZoneOffset) adjuster);
919 } else if (adjuster instanceof OffsetDateTime) {
920 return (OffsetDateTime) adjuster;
921 }
922 return (OffsetDateTime) adjuster.adjustInto(this);
923 }
924
925 /**
926 * Returns a copy of this date-time with the specified field set to a new value.
927 * <p>
928 * This returns an {@code OffsetDateTime}, based on this one, with the value
929 * for the specified field changed.
930 * This can be used to change any supported field, such as the year, month or day-of-month.
931 * If it is not possible to set the value, because the field is not supported or for
932 * some other reason, an exception is thrown.
933 * <p>
934 * In some cases, changing the specified field can cause the resulting date-time to become invalid,
935 * such as changing the month from 31st January to February would make the day-of-month invalid.
936 * In cases like this, the field is responsible for resolving the date. Typically it will choose
937 * the previous valid date, which would be the last valid day of February in this example.
938 * <p>
939 * If the field is a {@link ChronoField} then the adjustment is implemented here.
940 * <p>
941 * The {@code INSTANT_SECONDS} field will return a date-time with the specified instant.
942 * The offset and nano-of-second are unchanged.
943 * If the new instant value is outside the valid range then a {@code DateTimeException} will be thrown.
944 * <p>
945 * The {@code OFFSET_SECONDS} field will return a date-time with the specified offset.
946 * The local date-time is unaltered. If the new offset value is outside the valid range
947 * then a {@code DateTimeException} will be thrown.
948 * <p>
949 * The other {@link #isSupported(TemporalField) supported fields} will behave as per
950 * the matching method on {@link LocalDateTime#with(TemporalField, long) LocalDateTime}.
951 * In this case, the offset is not part of the calculation and will be unchanged.
952 * <p>
953 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
954 * <p>
955 * If the field is not a {@code ChronoField}, then the result of this method
956 * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
957 * passing {@code this} as the argument. In this case, the field determines
958 * whether and how to adjust the instant.
959 * <p>
960 * This instance is immutable and unaffected by this method call.
961 *
962 * @param field the field to set in the result, not null
963 * @param newValue the new value of the field in the result
964 * @return an {@code OffsetDateTime} based on {@code this} with the specified field set, not null
965 * @throws DateTimeException if the field cannot be set
966 * @throws UnsupportedTemporalTypeException if the field is not supported
967 * @throws ArithmeticException if numeric overflow occurs
968 */
969 @Override
970 public OffsetDateTime with(TemporalField field, long newValue) {
971 if (field instanceof ChronoField chronoField) {
972 return switch (chronoField) {
973 case INSTANT_SECONDS -> ofInstant(Instant.ofEpochSecond(newValue, getNano()), offset);
974 case OFFSET_SECONDS ->
975 with(dateTime, ZoneOffset.ofTotalSeconds(chronoField.checkValidIntValue(newValue)));
976 default -> with(dateTime.with(field, newValue), offset);
977 };
978 }
979 return field.adjustInto(this, newValue);
980 }
981
982 //-----------------------------------------------------------------------
983 /**
984 * Returns a copy of this {@code OffsetDateTime} with the year altered.
985 * <p>
986 * The time and offset do not affect the calculation and will be the same in the result.
987 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
988 * <p>
989 * This instance is immutable and unaffected by this method call.
990 *
991 * @param year the year to set in the result, from MIN_YEAR to MAX_YEAR
992 * @return an {@code OffsetDateTime} based on this date-time with the requested year, not null
993 * @throws DateTimeException if the year value is invalid
994 */
995 public OffsetDateTime withYear(int year) {
996 return with(dateTime.withYear(year), offset);
997 }
998
999 /**
1000 * Returns a copy of this {@code OffsetDateTime} with the month-of-year altered.
1001 * <p>
1002 * The time and offset do not affect the calculation and will be the same in the result.
1003 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
1004 * <p>
1005 * This instance is immutable and unaffected by this method call.
1006 *
1007 * @param month the month-of-year to set in the result, from 1 (January) to 12 (December)
1008 * @return an {@code OffsetDateTime} based on this date-time with the requested month, not null
1009 * @throws DateTimeException if the month-of-year value is invalid
1010 */
1011 public OffsetDateTime withMonth(int month) {
1012 return with(dateTime.withMonth(month), offset);
1013 }
1014
1015 /**
1016 * Returns a copy of this {@code OffsetDateTime} with the day-of-month altered.
1017 * <p>
1018 * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
1019 * The time and offset do not affect the calculation and will be the same in the result.
1020 * <p>
1021 * This instance is immutable and unaffected by this method call.
1022 *
1023 * @param dayOfMonth the day-of-month to set in the result, from 1 to 28-31
1024 * @return an {@code OffsetDateTime} based on this date-time with the requested day, not null
1025 * @throws DateTimeException if the day-of-month value is invalid,
1026 * or if the day-of-month is invalid for the month-year
1027 */
1028 public OffsetDateTime withDayOfMonth(int dayOfMonth) {
1029 return with(dateTime.withDayOfMonth(dayOfMonth), offset);
1030 }
1031
1032 /**
1033 * Returns a copy of this {@code OffsetDateTime} with the day-of-year altered.
1034 * <p>
1035 * The time and offset do not affect the calculation and will be the same in the result.
1036 * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
1037 * <p>
1038 * This instance is immutable and unaffected by this method call.
1039 *
1040 * @param dayOfYear the day-of-year to set in the result, from 1 to 365-366
1041 * @return an {@code OffsetDateTime} based on this date with the requested day, not null
1042 * @throws DateTimeException if the day-of-year value is invalid,
1043 * or if the day-of-year is invalid for the year
1044 */
1045 public OffsetDateTime withDayOfYear(int dayOfYear) {
1046 return with(dateTime.withDayOfYear(dayOfYear), offset);
1047 }
1048
1049 //-----------------------------------------------------------------------
1050 /**
1051 * Returns a copy of this {@code OffsetDateTime} with the hour-of-day altered.
1052 * <p>
1053 * The date and offset do not affect the calculation and will be the same in the result.
1054 * <p>
1055 * This instance is immutable and unaffected by this method call.
1056 *
1057 * @param hour the hour-of-day to set in the result, from 0 to 23
1058 * @return an {@code OffsetDateTime} based on this date-time with the requested hour, not null
1059 * @throws DateTimeException if the hour value is invalid
1060 */
1061 public OffsetDateTime withHour(int hour) {
1062 return with(dateTime.withHour(hour), offset);
1063 }
1064
1065 /**
1066 * Returns a copy of this {@code OffsetDateTime} with the minute-of-hour altered.
1067 * <p>
1068 * The date and offset do not affect the calculation and will be the same in the result.
1069 * <p>
1070 * This instance is immutable and unaffected by this method call.
1071 *
1072 * @param minute the minute-of-hour to set in the result, from 0 to 59
1073 * @return an {@code OffsetDateTime} based on this date-time with the requested minute, not null
1074 * @throws DateTimeException if the minute value is invalid
1075 */
1076 public OffsetDateTime withMinute(int minute) {
1077 return with(dateTime.withMinute(minute), offset);
1078 }
1079
1080 /**
1081 * Returns a copy of this {@code OffsetDateTime} with the second-of-minute altered.
1082 * <p>
1083 * The date and offset do not affect the calculation and will be the same in the result.
1084 * <p>
1085 * This instance is immutable and unaffected by this method call.
1086 *
1087 * @param second the second-of-minute to set in the result, from 0 to 59
1088 * @return an {@code OffsetDateTime} based on this date-time with the requested second, not null
1089 * @throws DateTimeException if the second value is invalid
1090 */
1091 public OffsetDateTime withSecond(int second) {
1092 return with(dateTime.withSecond(second), offset);
1093 }
1094
1095 /**
1096 * Returns a copy of this {@code OffsetDateTime} with the nano-of-second altered.
1097 * <p>
1098 * The date and offset do not affect the calculation and will be the same in the result.
1099 * <p>
1100 * This instance is immutable and unaffected by this method call.
1101 *
1102 * @param nanoOfSecond the nano-of-second to set in the result, from 0 to 999,999,999
1103 * @return an {@code OffsetDateTime} based on this date-time with the requested nanosecond, not null
1104 * @throws DateTimeException if the nano value is invalid
1105 */
1106 public OffsetDateTime withNano(int nanoOfSecond) {
1107 return with(dateTime.withNano(nanoOfSecond), offset);
1108 }
1109
1110 //-----------------------------------------------------------------------
1111 /**
1112 * Returns a copy of this {@code OffsetDateTime} with the time truncated.
1113 * <p>
1114 * Truncation returns a copy of the original date-time with fields
1115 * smaller than the specified unit set to zero.
1116 * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1117 * will set the second-of-minute and nano-of-second field to zero.
1118 * <p>
1119 * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
1120 * that divides into the length of a standard day without remainder.
1121 * This includes all supplied time units on {@link ChronoUnit} and
1122 * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
1123 * <p>
1124 * The offset does not affect the calculation and will be the same in the result.
1125 * <p>
1126 * This instance is immutable and unaffected by this method call.
1127 *
1128 * @param unit the unit to truncate to, not null
1129 * @return an {@code OffsetDateTime} based on this date-time with the time truncated, not null
1130 * @throws DateTimeException if unable to truncate
1131 * @throws UnsupportedTemporalTypeException if the unit is not supported
1132 */
1133 public OffsetDateTime truncatedTo(TemporalUnit unit) {
1134 return with(dateTime.truncatedTo(unit), offset);
1135 }
1136
1137 //-----------------------------------------------------------------------
1138 /**
1139 * Returns a copy of this date-time with the specified amount added.
1140 * <p>
1141 * This returns an {@code OffsetDateTime}, based on this one, with the specified amount added.
1142 * The amount is typically {@link Period} or {@link Duration} but may be
1143 * any other type implementing the {@link TemporalAmount} interface.
1144 * <p>
1145 * The calculation is delegated to the amount object by calling
1146 * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
1147 * to implement the addition in any way it wishes, however it typically
1148 * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
1149 * of the amount implementation to determine if it can be successfully added.
1150 * <p>
1151 * This instance is immutable and unaffected by this method call.
1152 *
1153 * @param amountToAdd the amount to add, not null
1154 * @return an {@code OffsetDateTime} based on this date-time with the addition made, not null
1155 * @throws DateTimeException if the addition cannot be made
1156 * @throws ArithmeticException if numeric overflow occurs
1157 */
1158 @Override
1159 public OffsetDateTime plus(TemporalAmount amountToAdd) {
1160 return (OffsetDateTime) amountToAdd.addTo(this);
1161 }
1162
1163 /**
1164 * Returns a copy of this date-time with the specified amount added.
1165 * <p>
1166 * This returns an {@code OffsetDateTime}, based on this one, with the amount
1167 * in terms of the unit added. If it is not possible to add the amount, because the
1168 * unit is not supported or for some other reason, an exception is thrown.
1169 * <p>
1170 * If the field is a {@link ChronoUnit} then the addition is implemented by
1171 * {@link LocalDateTime#plus(long, TemporalUnit)}.
1172 * The offset is not part of the calculation and will be unchanged in the result.
1173 * <p>
1174 * If the field is not a {@code ChronoUnit}, then the result of this method
1175 * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
1176 * passing {@code this} as the argument. In this case, the unit determines
1177 * whether and how to perform the addition.
1178 * <p>
1179 * This instance is immutable and unaffected by this method call.
1180 *
1181 * @param amountToAdd the amount of the unit to add to the result, may be negative
1182 * @param unit the unit of the amount to add, not null
1183 * @return an {@code OffsetDateTime} based on this date-time with the specified amount added, not null
1184 * @throws DateTimeException if the addition cannot be made
1185 * @throws UnsupportedTemporalTypeException if the unit is not supported
1186 * @throws ArithmeticException if numeric overflow occurs
1187 */
1188 @Override
1189 public OffsetDateTime plus(long amountToAdd, TemporalUnit unit) {
1190 if (unit instanceof ChronoUnit) {
1191 return with(dateTime.plus(amountToAdd, unit), offset);
1192 }
1193 return unit.addTo(this, amountToAdd);
1194 }
1195
1196 //-----------------------------------------------------------------------
1197 /**
1198 * Returns a copy of this {@code OffsetDateTime} with the specified number of years added.
1199 * <p>
1200 * This method adds the specified amount to the years field in three steps:
1201 * <ol>
1202 * <li>Add the input years to the year field</li>
1203 * <li>Check if the resulting date would be invalid</li>
1204 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1205 * </ol>
1206 * <p>
1207 * For example, 2008-02-29 (leap year) plus one year would result in the
1208 * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1209 * result, the last valid day of the month, 2009-02-28, is selected instead.
1210 * <p>
1211 * This instance is immutable and unaffected by this method call.
1212 *
1213 * @param years the years to add, may be negative
1214 * @return an {@code OffsetDateTime} based on this date-time with the years added, not null
1215 * @throws DateTimeException if the result exceeds the supported date range
1216 */
1217 public OffsetDateTime plusYears(long years) {
1218 return with(dateTime.plusYears(years), offset);
1219 }
1220
1221 /**
1222 * Returns a copy of this {@code OffsetDateTime} with the specified number of months added.
1223 * <p>
1224 * This method adds the specified amount to the months field in three steps:
1225 * <ol>
1226 * <li>Add the input months to the month-of-year field</li>
1227 * <li>Check if the resulting date would be invalid</li>
1228 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1229 * </ol>
1230 * <p>
1231 * For example, 2007-03-31 plus one month would result in the invalid date
1232 * 2007-04-31. Instead of returning an invalid result, the last valid day
1233 * of the month, 2007-04-30, is selected instead.
1234 * <p>
1235 * This instance is immutable and unaffected by this method call.
1236 *
1237 * @param months the months to add, may be negative
1238 * @return an {@code OffsetDateTime} based on this date-time with the months added, not null
1239 * @throws DateTimeException if the result exceeds the supported date range
1240 */
1241 public OffsetDateTime plusMonths(long months) {
1242 return with(dateTime.plusMonths(months), offset);
1243 }
1244
1245 /**
1246 * Returns a copy of this OffsetDateTime with the specified number of weeks added.
1247 * <p>
1248 * This method adds the specified amount in weeks to the days field incrementing
1249 * the month and year fields as necessary to ensure the result remains valid.
1250 * The result is only invalid if the maximum/minimum year is exceeded.
1251 * <p>
1252 * For example, 2008-12-31 plus one week would result in 2009-01-07.
1253 * <p>
1254 * This instance is immutable and unaffected by this method call.
1255 *
1256 * @param weeks the weeks to add, may be negative
1257 * @return an {@code OffsetDateTime} based on this date-time with the weeks added, not null
1258 * @throws DateTimeException if the result exceeds the supported date range
1259 */
1260 public OffsetDateTime plusWeeks(long weeks) {
1261 return with(dateTime.plusWeeks(weeks), offset);
1262 }
1263
1264 /**
1265 * Returns a copy of this OffsetDateTime with the specified number of days added.
1266 * <p>
1267 * This method adds the specified amount to the days field incrementing the
1268 * month and year fields as necessary to ensure the result remains valid.
1269 * The result is only invalid if the maximum/minimum year is exceeded.
1270 * <p>
1271 * For example, 2008-12-31 plus one day would result in 2009-01-01.
1272 * <p>
1273 * This instance is immutable and unaffected by this method call.
1274 *
1275 * @param days the days to add, may be negative
1276 * @return an {@code OffsetDateTime} based on this date-time with the days added, not null
1277 * @throws DateTimeException if the result exceeds the supported date range
1278 */
1279 public OffsetDateTime plusDays(long days) {
1280 return with(dateTime.plusDays(days), offset);
1281 }
1282
1283 /**
1284 * Returns a copy of this {@code OffsetDateTime} with the specified number of hours added.
1285 * <p>
1286 * This instance is immutable and unaffected by this method call.
1287 *
1288 * @param hours the hours to add, may be negative
1289 * @return an {@code OffsetDateTime} based on this date-time with the hours added, not null
1290 * @throws DateTimeException if the result exceeds the supported date range
1291 */
1292 public OffsetDateTime plusHours(long hours) {
1293 return with(dateTime.plusHours(hours), offset);
1294 }
1295
1296 /**
1297 * Returns a copy of this {@code OffsetDateTime} with the specified number of minutes added.
1298 * <p>
1299 * This instance is immutable and unaffected by this method call.
1300 *
1301 * @param minutes the minutes to add, may be negative
1302 * @return an {@code OffsetDateTime} based on this date-time with the minutes added, not null
1303 * @throws DateTimeException if the result exceeds the supported date range
1304 */
1305 public OffsetDateTime plusMinutes(long minutes) {
1306 return with(dateTime.plusMinutes(minutes), offset);
1307 }
1308
1309 /**
1310 * Returns a copy of this {@code OffsetDateTime} with the specified number of seconds added.
1311 * <p>
1312 * This instance is immutable and unaffected by this method call.
1313 *
1314 * @param seconds the seconds to add, may be negative
1315 * @return an {@code OffsetDateTime} based on this date-time with the seconds added, not null
1316 * @throws DateTimeException if the result exceeds the supported date range
1317 */
1318 public OffsetDateTime plusSeconds(long seconds) {
1319 return with(dateTime.plusSeconds(seconds), offset);
1320 }
1321
1322 /**
1323 * Returns a copy of this {@code OffsetDateTime} with the specified number of nanoseconds added.
1324 * <p>
1325 * This instance is immutable and unaffected by this method call.
1326 *
1327 * @param nanos the nanos to add, may be negative
1328 * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds added, not null
1329 * @throws DateTimeException if the unit cannot be added to this type
1330 */
1331 public OffsetDateTime plusNanos(long nanos) {
1332 return with(dateTime.plusNanos(nanos), offset);
1333 }
1334
1335 //-----------------------------------------------------------------------
1336 /**
1337 * Returns a copy of this date-time with the specified amount subtracted.
1338 * <p>
1339 * This returns an {@code OffsetDateTime}, based on this one, with the specified amount subtracted.
1340 * The amount is typically {@link Period} or {@link Duration} but may be
1341 * any other type implementing the {@link TemporalAmount} interface.
1342 * <p>
1343 * The calculation is delegated to the amount object by calling
1344 * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
1345 * to implement the subtraction in any way it wishes, however it typically
1346 * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
1347 * of the amount implementation to determine if it can be successfully subtracted.
1348 * <p>
1349 * This instance is immutable and unaffected by this method call.
1350 *
1351 * @param amountToSubtract the amount to subtract, not null
1352 * @return an {@code OffsetDateTime} based on this date-time with the subtraction made, not null
1353 * @throws DateTimeException if the subtraction cannot be made
1354 * @throws ArithmeticException if numeric overflow occurs
1355 */
1356 @Override
1357 public OffsetDateTime minus(TemporalAmount amountToSubtract) {
1358 return (OffsetDateTime) amountToSubtract.subtractFrom(this);
1359 }
1360
1361 /**
1362 * Returns a copy of this date-time with the specified amount subtracted.
1363 * <p>
1364 * This returns an {@code OffsetDateTime}, based on this one, with the amount
1365 * in terms of the unit subtracted. If it is not possible to subtract the amount,
1366 * because the unit is not supported or for some other reason, an exception is thrown.
1367 * <p>
1368 * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
1369 * See that method for a full description of how addition, and thus subtraction, works.
1370 * <p>
1371 * This instance is immutable and unaffected by this method call.
1372 *
1373 * @param amountToSubtract the amount of the unit to subtract from the result, may be negative
1374 * @param unit the unit of the amount to subtract, not null
1375 * @return an {@code OffsetDateTime} based on this date-time with the specified amount subtracted, not null
1376 * @throws DateTimeException if the subtraction cannot be made
1377 * @throws UnsupportedTemporalTypeException if the unit is not supported
1378 * @throws ArithmeticException if numeric overflow occurs
1379 */
1380 @Override
1381 public OffsetDateTime minus(long amountToSubtract, TemporalUnit unit) {
1382 return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1383 }
1384
1385 //-----------------------------------------------------------------------
1386 /**
1387 * Returns a copy of this {@code OffsetDateTime} with the specified number of years subtracted.
1388 * <p>
1389 * This method subtracts the specified amount from the years field in three steps:
1390 * <ol>
1391 * <li>Subtract the input years from the year field</li>
1392 * <li>Check if the resulting date would be invalid</li>
1393 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1394 * </ol>
1395 * <p>
1396 * For example, 2008-02-29 (leap year) minus one year would result in the
1397 * invalid date 2007-02-29 (standard year). Instead of returning an invalid
1398 * result, the last valid day of the month, 2007-02-28, is selected instead.
1399 * <p>
1400 * This instance is immutable and unaffected by this method call.
1401 *
1402 * @param years the years to subtract, may be negative
1403 * @return an {@code OffsetDateTime} based on this date-time with the years subtracted, not null
1404 * @throws DateTimeException if the result exceeds the supported date range
1405 */
1406 public OffsetDateTime minusYears(long years) {
1407 return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1408 }
1409
1410 /**
1411 * Returns a copy of this {@code OffsetDateTime} with the specified number of months subtracted.
1412 * <p>
1413 * This method subtracts the specified amount from the months field in three steps:
1414 * <ol>
1415 * <li>Subtract the input months from the month-of-year field</li>
1416 * <li>Check if the resulting date would be invalid</li>
1417 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1418 * </ol>
1419 * <p>
1420 * For example, 2007-03-31 minus one month would result in the invalid date
1421 * 2007-02-31. Instead of returning an invalid result, the last valid day
1422 * of the month, 2007-02-28, is selected instead.
1423 * <p>
1424 * This instance is immutable and unaffected by this method call.
1425 *
1426 * @param months the months to subtract, may be negative
1427 * @return an {@code OffsetDateTime} based on this date-time with the months subtracted, not null
1428 * @throws DateTimeException if the result exceeds the supported date range
1429 */
1430 public OffsetDateTime minusMonths(long months) {
1431 return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1432 }
1433
1434 /**
1435 * Returns a copy of this {@code OffsetDateTime} with the specified number of weeks subtracted.
1436 * <p>
1437 * This method subtracts the specified amount in weeks from the days field decrementing
1438 * the month and year fields as necessary to ensure the result remains valid.
1439 * The result is only invalid if the maximum/minimum year is exceeded.
1440 * <p>
1441 * For example, 2009-01-07 minus one week would result in 2008-12-31.
1442 * <p>
1443 * This instance is immutable and unaffected by this method call.
1444 *
1445 * @param weeks the weeks to subtract, may be negative
1446 * @return an {@code OffsetDateTime} based on this date-time with the weeks subtracted, not null
1447 * @throws DateTimeException if the result exceeds the supported date range
1448 */
1449 public OffsetDateTime minusWeeks(long weeks) {
1450 return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1451 }
1452
1453 /**
1454 * Returns a copy of this {@code OffsetDateTime} with the specified number of days subtracted.
1455 * <p>
1456 * This method subtracts the specified amount from the days field decrementing the
1457 * month and year fields as necessary to ensure the result remains valid.
1458 * The result is only invalid if the maximum/minimum year is exceeded.
1459 * <p>
1460 * For example, 2009-01-01 minus one day would result in 2008-12-31.
1461 * <p>
1462 * This instance is immutable and unaffected by this method call.
1463 *
1464 * @param days the days to subtract, may be negative
1465 * @return an {@code OffsetDateTime} based on this date-time with the days subtracted, not null
1466 * @throws DateTimeException if the result exceeds the supported date range
1467 */
1468 public OffsetDateTime minusDays(long days) {
1469 return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1470 }
1471
1472 /**
1473 * Returns a copy of this {@code OffsetDateTime} with the specified number of hours subtracted.
1474 * <p>
1475 * This instance is immutable and unaffected by this method call.
1476 *
1477 * @param hours the hours to subtract, may be negative
1478 * @return an {@code OffsetDateTime} based on this date-time with the hours subtracted, not null
1479 * @throws DateTimeException if the result exceeds the supported date range
1480 */
1481 public OffsetDateTime minusHours(long hours) {
1482 return (hours == Long.MIN_VALUE ? plusHours(Long.MAX_VALUE).plusHours(1) : plusHours(-hours));
1483 }
1484
1485 /**
1486 * Returns a copy of this {@code OffsetDateTime} with the specified number of minutes subtracted.
1487 * <p>
1488 * This instance is immutable and unaffected by this method call.
1489 *
1490 * @param minutes the minutes to subtract, may be negative
1491 * @return an {@code OffsetDateTime} based on this date-time with the minutes subtracted, not null
1492 * @throws DateTimeException if the result exceeds the supported date range
1493 */
1494 public OffsetDateTime minusMinutes(long minutes) {
1495 return (minutes == Long.MIN_VALUE ? plusMinutes(Long.MAX_VALUE).plusMinutes(1) : plusMinutes(-minutes));
1496 }
1497
1498 /**
1499 * Returns a copy of this {@code OffsetDateTime} with the specified number of seconds subtracted.
1500 * <p>
1501 * This instance is immutable and unaffected by this method call.
1502 *
1503 * @param seconds the seconds to subtract, may be negative
1504 * @return an {@code OffsetDateTime} based on this date-time with the seconds subtracted, not null
1505 * @throws DateTimeException if the result exceeds the supported date range
1506 */
1507 public OffsetDateTime minusSeconds(long seconds) {
1508 return (seconds == Long.MIN_VALUE ? plusSeconds(Long.MAX_VALUE).plusSeconds(1) : plusSeconds(-seconds));
1509 }
1510
1511 /**
1512 * Returns a copy of this {@code OffsetDateTime} with the specified number of nanoseconds subtracted.
1513 * <p>
1514 * This instance is immutable and unaffected by this method call.
1515 *
1516 * @param nanos the nanos to subtract, may be negative
1517 * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds subtracted, not null
1518 * @throws DateTimeException if the result exceeds the supported date range
1519 */
1520 public OffsetDateTime minusNanos(long nanos) {
1521 return (nanos == Long.MIN_VALUE ? plusNanos(Long.MAX_VALUE).plusNanos(1) : plusNanos(-nanos));
1522 }
1523
1524 //-----------------------------------------------------------------------
1525 /**
1526 * Queries this date-time using the specified query.
1527 * <p>
1528 * This queries this date-time using the specified query strategy object.
1529 * The {@code TemporalQuery} object defines the logic to be used to
1530 * obtain the result. Read the documentation of the query to understand
1531 * what the result of this method will be.
1532 * <p>
1533 * The result of this method is obtained by invoking the
1534 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
1535 * specified query passing {@code this} as the argument.
1536 *
1537 * @param <R> the type of the result
1538 * @param query the query to invoke, not null
1539 * @return the query result, null may be returned (defined by the query)
1540 * @throws DateTimeException if unable to query (defined by the query)
1541 * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1542 */
1543 @SuppressWarnings("unchecked")
1544 @Override
1545 public <R> R query(TemporalQuery<R> query) {
1546 if (query == TemporalQueries.offset() || query == TemporalQueries.zone()) {
1547 return (R) getOffset();
1548 } else if (query == TemporalQueries.zoneId()) {
1549 return null;
1550 } else if (query == TemporalQueries.localDate()) {
1551 return (R) toLocalDate();
1552 } else if (query == TemporalQueries.localTime()) {
1553 return (R) toLocalTime();
1554 } else if (query == TemporalQueries.chronology()) {
1555 return (R) IsoChronology.INSTANCE;
1556 } else if (query == TemporalQueries.precision()) {
1557 return (R) NANOS;
1558 }
1559 // inline TemporalAccessor.super.query(query) as an optimization
1560 // non-JDK classes are not permitted to make this optimization
1561 return query.queryFrom(this);
1562 }
1563
1564 /**
1565 * Adjusts the specified temporal object to have the same offset, date
1566 * and time as this object.
1567 * <p>
1568 * This returns a temporal object of the same observable type as the input
1569 * with the offset, date and time changed to be the same as this.
1570 * <p>
1571 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1572 * three times, passing {@link ChronoField#EPOCH_DAY},
1573 * {@link ChronoField#NANO_OF_DAY} and {@link ChronoField#OFFSET_SECONDS} as the fields.
1574 * <p>
1575 * In most cases, it is clearer to reverse the calling pattern by using
1576 * {@link Temporal#with(TemporalAdjuster)}:
1577 * <pre>
1578 * // these two lines are equivalent, but the second approach is recommended
1579 * temporal = thisOffsetDateTime.adjustInto(temporal);
1580 * temporal = temporal.with(thisOffsetDateTime);
1581 * </pre>
1582 * <p>
1583 * This instance is immutable and unaffected by this method call.
1584 *
1585 * @param temporal the target object to be adjusted, not null
1586 * @return the adjusted object, not null
1587 * @throws DateTimeException if unable to make the adjustment
1588 * @throws ArithmeticException if numeric overflow occurs
1589 */
1590 @Override
1591 public Temporal adjustInto(Temporal temporal) {
1592 // OffsetDateTime is treated as three separate fields, not an instant
1593 // this produces the most consistent set of results overall
1594 // the offset is set after the date and time, as it is typically a small
1595 // tweak to the result, with ZonedDateTime frequently ignoring the offset
1596 return temporal
1597 .with(EPOCH_DAY, toLocalDate().toEpochDay())
1598 .with(NANO_OF_DAY, toLocalTime().toNanoOfDay())
1599 .with(OFFSET_SECONDS, getOffset().getTotalSeconds());
1600 }
1601
1602 /**
1603 * Calculates the amount of time until another date-time in terms of the specified unit.
1604 * <p>
1605 * This calculates the amount of time between two {@code OffsetDateTime}
1606 * objects in terms of a single {@code TemporalUnit}.
1607 * The start and end points are {@code this} and the specified date-time.
1608 * The result will be negative if the end is before the start.
1609 * For example, the amount in days between two date-times can be calculated
1610 * using {@code startDateTime.until(endDateTime, DAYS)}.
1611 * <p>
1612 * The {@code Temporal} passed to this method is converted to a
1613 * {@code OffsetDateTime} using {@link #from(TemporalAccessor)}.
1614 * If the offset differs between the two date-times, the specified
1615 * end date-time is normalized to have the same offset as this date-time.
1616 * <p>
1617 * The calculation returns a whole number, representing the number of
1618 * complete units between the two date-times.
1619 * For example, the amount in months between 2012-06-15T00:00Z and 2012-08-14T23:59Z
1620 * will only be one month as it is one minute short of two months.
1621 * <p>
1622 * There are two equivalent ways of using this method.
1623 * The first is to invoke this method.
1624 * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
1625 * <pre>
1626 * // these two lines are equivalent
1627 * amount = start.until(end, MONTHS);
1628 * amount = MONTHS.between(start, end);
1629 * </pre>
1630 * The choice should be made based on which makes the code more readable.
1631 * <p>
1632 * The calculation is implemented in this method for {@link ChronoUnit}.
1633 * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1634 * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1635 * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1636 * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1637 * Other {@code ChronoUnit} values will throw an exception.
1638 * <p>
1639 * If the unit is not a {@code ChronoUnit}, then the result of this method
1640 * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1641 * passing {@code this} as the first argument and the converted input temporal
1642 * as the second argument.
1643 * <p>
1644 * This instance is immutable and unaffected by this method call.
1645 *
1646 * @param endExclusive the end date, exclusive, which is converted to an {@code OffsetDateTime}, not null
1647 * @param unit the unit to measure the amount in, not null
1648 * @return the amount of time between this date-time and the end date-time
1649 * @throws DateTimeException if the amount cannot be calculated, or the end
1650 * temporal cannot be converted to an {@code OffsetDateTime}
1651 * @throws UnsupportedTemporalTypeException if the unit is not supported
1652 * @throws ArithmeticException if numeric overflow occurs
1653 */
1654 @Override
1655 public long until(Temporal endExclusive, TemporalUnit unit) {
1656 OffsetDateTime end = OffsetDateTime.from(endExclusive);
1657 if (unit instanceof ChronoUnit) {
1658 OffsetDateTime start = this;
1659 try {
1660 end = end.withOffsetSameInstant(offset);
1661 } catch (DateTimeException ex) {
1662 // end may be out of valid range. Adjust to end's offset.
1663 start = withOffsetSameInstant(end.offset);
1664 }
1665 return start.dateTime.until(end.dateTime, unit);
1666 }
1667 return unit.between(this, end);
1668 }
1669
1670 /**
1671 * Formats this date-time using the specified formatter.
1672 * <p>
1673 * This date-time will be passed to the formatter to produce a string.
1674 *
1675 * @param formatter the formatter to use, not null
1676 * @return the formatted date-time string, not null
1677 * @throws DateTimeException if an error occurs during printing
1678 */
1679 public String format(DateTimeFormatter formatter) {
1680 Objects.requireNonNull(formatter, "formatter");
1681 return formatter.format(this);
1682 }
1683
1684 //-----------------------------------------------------------------------
1685 /**
1686 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
1687 * ensuring that the result has the same instant.
1688 * <p>
1689 * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
1690 * This conversion will ignore the visible local date-time and use the underlying instant instead.
1691 * This avoids any problems with local time-line gaps or overlaps.
1692 * The result might have different values for fields such as hour, minute an even day.
1693 * <p>
1694 * To attempt to retain the values of the fields, use {@link #atZoneSimilarLocal(ZoneId)}.
1695 * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
1696 *
1697 * @param zone the time-zone to use, not null
1698 * @return the zoned date-time formed from this date-time, not null
1699 */
1700 public ZonedDateTime atZoneSameInstant(ZoneId zone) {
1701 return ZonedDateTime.ofInstant(dateTime, offset, zone);
1702 }
1703
1704 /**
1705 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
1706 * trying to keep the same local date and time.
1707 * <p>
1708 * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
1709 * Where possible, the result will have the same local date-time as this object.
1710 * <p>
1711 * Time-zone rules, such as daylight savings, mean that not every time on the
1712 * local time-line exists. If the local date-time is in a gap or overlap according to
1713 * the rules then a resolver is used to determine the resultant local time and offset.
1714 * This method uses {@link ZonedDateTime#ofLocal(LocalDateTime, ZoneId, ZoneOffset)}
1715 * to retain the offset from this instance if possible.
1716 * <p>
1717 * Finer control over gaps and overlaps is available in two ways.
1718 * If you simply want to use the later offset at overlaps then call
1719 * {@link ZonedDateTime#withLaterOffsetAtOverlap()} immediately after this method.
1720 * <p>
1721 * To create a zoned date-time at the same instant irrespective of the local time-line,
1722 * use {@link #atZoneSameInstant(ZoneId)}.
1723 * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
1724 *
1725 * @param zone the time-zone to use, not null
1726 * @return the zoned date-time formed from this date and the earliest valid time for the zone, not null
1727 */
1728 public ZonedDateTime atZoneSimilarLocal(ZoneId zone) {
1729 return ZonedDateTime.ofLocal(dateTime, zone, offset);
1730 }
1731
1732 //-----------------------------------------------------------------------
1733 /**
1734 * Converts this date-time to an {@code OffsetTime}.
1735 * <p>
1736 * This returns an offset time with the same local time and offset.
1737 *
1738 * @return an OffsetTime representing the time and offset, not null
1739 */
1740 public OffsetTime toOffsetTime() {
1741 return OffsetTime.of(dateTime.toLocalTime(), offset);
1742 }
1743
1744 /**
1745 * Converts this date-time to a {@code ZonedDateTime} using the offset as the zone ID.
1746 * <p>
1747 * This creates the simplest possible {@code ZonedDateTime} using the offset
1748 * as the zone ID.
1749 * <p>
1750 * To control the time-zone used, see {@link #atZoneSameInstant(ZoneId)} and
1751 * {@link #atZoneSimilarLocal(ZoneId)}.
1752 *
1753 * @return a zoned date-time representing the same local date-time and offset, not null
1754 */
1755 public ZonedDateTime toZonedDateTime() {
1756 return ZonedDateTime.of(dateTime, offset);
1757 }
1758
1759 /**
1760 * Converts this date-time to an {@code Instant}.
1761 * <p>
1762 * This returns an {@code Instant} representing the same point on the
1763 * time-line as this date-time.
1764 *
1765 * @return an {@code Instant} representing the same instant, not null
1766 */
1767 public Instant toInstant() {
1768 return dateTime.toInstant(offset);
1769 }
1770
1771 /**
1772 * Converts this date-time to the number of seconds from the epoch of 1970-01-01T00:00:00Z.
1773 * <p>
1774 * This allows this date-time to be converted to a value of the
1775 * {@link ChronoField#INSTANT_SECONDS epoch-seconds} field. This is primarily
1776 * intended for low-level conversions rather than general application usage.
1777 *
1778 * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z
1779 */
1780 public long toEpochSecond() {
1781 return dateTime.toEpochSecond(offset);
1782 }
1783
1784 //-----------------------------------------------------------------------
1785 /**
1786 * Compares this date-time to another date-time.
1787 * <p>
1788 * The comparison is based on the instant then on the local date-time.
1789 * It is "consistent with equals", as defined by {@link Comparable}.
1790 * <p>
1791 * For example, the following is the comparator order:
1792 * <ol>
1793 * <li>{@code 2008-12-03T10:30+01:00}</li>
1794 * <li>{@code 2008-12-03T11:00+01:00}</li>
1795 * <li>{@code 2008-12-03T12:00+02:00}</li>
1796 * <li>{@code 2008-12-03T11:30+01:00}</li>
1797 * <li>{@code 2008-12-03T12:00+01:00}</li>
1798 * <li>{@code 2008-12-03T12:30+01:00}</li>
1799 * </ol>
1800 * Values #2 and #3 represent the same instant on the time-line.
1801 * When two values represent the same instant, the local date-time is compared
1802 * to distinguish them. This step is needed to make the ordering
1803 * consistent with {@code equals()}.
1804 *
1805 * @param other the other date-time to compare to, not null
1806 * @return the comparator value, that is the comparison with the {@code other}'s instant, if they are not equal;
1807 * and if equal to the {@code other}'s instant, the comparison of the {@code other}'s local date-time
1808 * @see #isBefore
1809 * @see #isAfter
1810 */
1811 @Override
1812 public int compareTo(OffsetDateTime other) {
1813 int cmp = getOffset().compareTo(other.getOffset());
1814 if (cmp != 0) {
1815 cmp = Long.compare(toEpochSecond(), other.toEpochSecond());
1816 if (cmp == 0) {
1817 cmp = toLocalTime().getNano() - other.toLocalTime().getNano();
1818 }
1819 }
1820 if (cmp == 0) {
1821 cmp = toLocalDateTime().compareTo(other.toLocalDateTime());
1822 }
1823 return cmp;
1824 }
1825
1826 //-----------------------------------------------------------------------
1827 /**
1828 * Checks if the instant of this date-time is after that of the specified date-time.
1829 * <p>
1830 * This method differs from the comparison in {@link #compareTo} and {@link #equals} in that it
1831 * only compares the instant of the date-time. This is equivalent to using
1832 * {@code dateTime1.toInstant().isAfter(dateTime2.toInstant());}.
1833 *
1834 * @param other the other date-time to compare to, not null
1835 * @return true if this is after the instant of the specified date-time
1836 */
1837 public boolean isAfter(OffsetDateTime other) {
1838 long thisEpochSec = toEpochSecond();
1839 long otherEpochSec = other.toEpochSecond();
1840 return thisEpochSec > otherEpochSec ||
1841 (thisEpochSec == otherEpochSec && toLocalTime().getNano() > other.toLocalTime().getNano());
1842 }
1843
1844 /**
1845 * Checks if the instant of this date-time is before that of the specified date-time.
1846 * <p>
1847 * This method differs from the comparison in {@link #compareTo} in that it
1848 * only compares the instant of the date-time. This is equivalent to using
1849 * {@code dateTime1.toInstant().isBefore(dateTime2.toInstant());}.
1850 *
1851 * @param other the other date-time to compare to, not null
1852 * @return true if this is before the instant of the specified date-time
1853 */
1854 public boolean isBefore(OffsetDateTime other) {
1855 long thisEpochSec = toEpochSecond();
1856 long otherEpochSec = other.toEpochSecond();
1857 return thisEpochSec < otherEpochSec ||
1858 (thisEpochSec == otherEpochSec && toLocalTime().getNano() < other.toLocalTime().getNano());
1859 }
1860
1861 /**
1862 * Checks if the instant of this date-time is equal to that of the specified date-time.
1863 * <p>
1864 * This method differs from the comparison in {@link #compareTo} and {@link #equals}
1865 * in that it only compares the instant of the date-time. This is equivalent to using
1866 * {@code dateTime1.toInstant().equals(dateTime2.toInstant());}.
1867 *
1868 * @param other the other date-time to compare to, not null
1869 * @return true if the instant equals the instant of the specified date-time
1870 */
1871 public boolean isEqual(OffsetDateTime other) {
1872 return toEpochSecond() == other.toEpochSecond() &&
1873 toLocalTime().getNano() == other.toLocalTime().getNano();
1874 }
1875
1876 //-----------------------------------------------------------------------
1877 /**
1878 * Checks if this date-time is equal to another date-time.
1879 * <p>
1880 * The comparison is based on the local date-time and the offset.
1881 * To compare for the same instant on the time-line, use {@link #isEqual}.
1882 * Only objects of type {@code OffsetDateTime} are compared, other types return false.
1883 *
1884 * @param obj the object to check, null returns false
1885 * @return true if this is equal to the other date-time
1886 */
1887 @Override
1888 public boolean equals(Object obj) {
1889 if (this == obj) {
1890 return true;
1891 }
1892 return (obj instanceof OffsetDateTime other)
1893 && dateTime.equals(other.dateTime)
1894 && offset.equals(other.offset);
1895 }
1896
1897 /**
1898 * A hash code for this date-time.
1899 *
1900 * @return a suitable hash code
1901 */
1902 @Override
1903 public int hashCode() {
1904 return dateTime.hashCode() ^ offset.hashCode();
1905 }
1906
1907 //-----------------------------------------------------------------------
1908 /**
1909 * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30+01:00}.
1910 * <p>
1911 * The output will be one of the following formats:
1912 * <ul>
1913 * <li>{@code uuuu-MM-dd'T'HH:mmXXXXX}</li>
1914 * <li>{@code uuuu-MM-dd'T'HH:mm:ssXXXXX}</li>
1915 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSXXXXX}</li>
1916 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSXXXXX}</li>
1917 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSSXXXXX}</li>
1918 * </ul>
1919 * The format used will be the shortest that outputs the full value of
1920 * the time where the omitted parts are implied to be zero. The output
1921 * is compatible with ISO 8601 if the seconds in the offset are zero.
1922 *
1923 * @return a string representation of this date-time, not null
1924 */
1925 @Override
1926 public String toString() {
1927 var offsetStr = offset.toString();
1928 var buf = new StringBuilder(29 + offsetStr.length());
1929 dateTime.formatTo(buf);
1930 return buf.append(offsetStr).toString();
1931 }
1932
1933 //-----------------------------------------------------------------------
1934 /**
1935 * Writes the object using a
1936 * <a href="{@docRoot}/serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1937 * @serialData
1938 * <pre>
1939 * out.writeByte(10); // identifies an OffsetDateTime
1940 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalDateTime">datetime</a> excluding the one byte header
1941 * // the <a href="{@docRoot}/serialized-form.html#java.time.ZoneOffset">offset</a> excluding the one byte header
1942 * </pre>
1943 *
1944 * @return the instance of {@code Ser}, not null
1945 */
1946 @java.io.Serial
1947 private Object writeReplace() {
1948 return new Ser(Ser.OFFSET_DATE_TIME_TYPE, this);
1949 }
1950
1951 /**
1952 * Defend against malicious streams.
1953 *
1954 * @param s the stream to read
1955 * @throws InvalidObjectException always
1956 */
1957 @java.io.Serial
1958 private void readObject(ObjectInputStream s) throws InvalidObjectException {
1959 throw new InvalidObjectException("Deserialization via serialization delegate");
1960 }
1961
1962 void writeExternal(ObjectOutput out) throws IOException {
1963 dateTime.writeExternal(out);
1964 offset.writeExternal(out);
1965 }
1966
1967 static OffsetDateTime readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
1968 LocalDateTime dateTime = LocalDateTime.readExternal(in);
1969 ZoneOffset offset = ZoneOffset.readExternal(in);
1970 return OffsetDateTime.of(dateTime, offset);
1971 }
1972
1973 }