106 * often viewed as year-month-day-hour-minute-second. Other date and time fields,
107 * such as day-of-year, day-of-week and week-of-year, can also be accessed.
108 * Time is represented to nanosecond precision.
109 * For example, the value "2nd October 2007 at 13:45.30.123456789" can be
110 * stored in a {@code LocalDateTime}.
111 * <p>
112 * This class does not store or represent a time-zone.
113 * Instead, it is a description of the date, as used for birthdays, combined with
114 * the local time as seen on a wall clock.
115 * It cannot represent an instant on the time-line without additional information
116 * such as an offset or time-zone.
117 * <p>
118 * The ISO-8601 calendar system is the modern civil calendar system used today
119 * in most of the world. It is equivalent to the proleptic Gregorian calendar
120 * system, in which today's rules for leap years are applied for all time.
121 * For most applications written today, the ISO-8601 rules are entirely suitable.
122 * However, any application that makes use of historical dates, and requires them
123 * to be accurate will find the ISO-8601 approach unsuitable.
124 * <p>
125 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
126 * class; programmers should treat instances that are
127 * {@linkplain #equals(Object) equal} as interchangeable and should not
128 * use instances for synchronization, or unpredictable behavior may
129 * occur. For example, in a future release, synchronization may fail.
130 * The {@code equals} method should be used for comparisons.
131 *
132 * @implSpec
133 * This class is immutable and thread-safe.
134 *
135 * @since 1.8
136 */
137 @jdk.internal.ValueBased
138 public final class LocalDateTime
139 implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable {
140
141 /**
142 * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
143 * This is the local date-time of midnight at the start of the minimum date.
144 * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
145 * This could be used by an application as a "far past" date-time.
146 */
147 public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
148 /**
149 * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
150 * This is the local date-time just before midnight at the end of the maximum date.
151 * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
152 * This could be used by an application as a "far future" date-time.
153 */
154 public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);
155
156 /**
157 * Serialization version.
1981 * <pre>
1982 * out.writeByte(5); // identifies a LocalDateTime
1983 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1984 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1985 * </pre>
1986 *
1987 * @return the instance of {@code Ser}, not null
1988 */
1989 @java.io.Serial
1990 private Object writeReplace() {
1991 return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
1992 }
1993
1994 /**
1995 * Defend against malicious streams.
1996 *
1997 * @param s the stream to read
1998 * @throws InvalidObjectException always
1999 */
2000 @java.io.Serial
2001 private void readObject(ObjectInputStream s) throws InvalidObjectException {
2002 throw new InvalidObjectException("Deserialization via serialization delegate");
2003 }
2004
2005 void writeExternal(DataOutput out) throws IOException {
2006 date.writeExternal(out);
2007 time.writeExternal(out);
2008 }
2009
2010 static LocalDateTime readExternal(DataInput in) throws IOException {
2011 LocalDate date = LocalDate.readExternal(in);
2012 LocalTime time = LocalTime.readExternal(in);
2013 return LocalDateTime.of(date, time);
2014 }
2015 }
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106 * often viewed as year-month-day-hour-minute-second. Other date and time fields,
107 * such as day-of-year, day-of-week and week-of-year, can also be accessed.
108 * Time is represented to nanosecond precision.
109 * For example, the value "2nd October 2007 at 13:45.30.123456789" can be
110 * stored in a {@code LocalDateTime}.
111 * <p>
112 * This class does not store or represent a time-zone.
113 * Instead, it is a description of the date, as used for birthdays, combined with
114 * the local time as seen on a wall clock.
115 * It cannot represent an instant on the time-line without additional information
116 * such as an offset or time-zone.
117 * <p>
118 * The ISO-8601 calendar system is the modern civil calendar system used today
119 * in most of the world. It is equivalent to the proleptic Gregorian calendar
120 * system, in which today's rules for leap years are applied for all time.
121 * For most applications written today, the ISO-8601 rules are entirely suitable.
122 * However, any application that makes use of historical dates, and requires them
123 * to be accurate will find the ISO-8601 approach unsuitable.
124 * <p>
125 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
126 * class; programmers should treat instances that are {@linkplain #equals(Object) equal}
127 * as interchangeable and should not use instances for synchronization, mutexes, or
128 * with {@linkplain java.lang.ref.Reference object references}.
129 *
130 * <div class="preview-block">
131 * <div class="preview-comment">
132 * When preview features are enabled, {@code LocalDateTime} is a {@linkplain Class#isValue value class}.
133 * Use of value class instances for synchronization, mutexes, or with
134 * {@linkplain java.lang.ref.Reference object references} result in
135 * {@link IdentityException}.
136 * </div>
137 * </div>
138 *
139 * @implSpec
140 * This class is immutable and thread-safe.
141 *
142 * @since 1.8
143 */
144 @jdk.internal.ValueBased
145 @jdk.internal.MigratedValueClass
146 public final class LocalDateTime
147 implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable {
148
149 /**
150 * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
151 * This is the local date-time of midnight at the start of the minimum date.
152 * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
153 * This could be used by an application as a "far past" date-time.
154 */
155 public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
156 /**
157 * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
158 * This is the local date-time just before midnight at the end of the maximum date.
159 * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
160 * This could be used by an application as a "far future" date-time.
161 */
162 public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);
163
164 /**
165 * Serialization version.
1989 * <pre>
1990 * out.writeByte(5); // identifies a LocalDateTime
1991 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1992 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1993 * </pre>
1994 *
1995 * @return the instance of {@code Ser}, not null
1996 */
1997 @java.io.Serial
1998 private Object writeReplace() {
1999 return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
2000 }
2001
2002 /**
2003 * Defend against malicious streams.
2004 *
2005 * @param s the stream to read
2006 * @throws InvalidObjectException always
2007 */
2008 @java.io.Serial
2009 @SuppressWarnings("serial") // this method is not invoked for value classes
2010 private void readObject(ObjectInputStream s) throws InvalidObjectException {
2011 throw new InvalidObjectException("Deserialization via serialization delegate");
2012 }
2013
2014 void writeExternal(DataOutput out) throws IOException {
2015 date.writeExternal(out);
2016 time.writeExternal(out);
2017 }
2018
2019 static LocalDateTime readExternal(DataInput in) throws IOException {
2020 LocalDate date = LocalDate.readExternal(in);
2021 LocalTime time = LocalTime.readExternal(in);
2022 return LocalDateTime.of(date, time);
2023 }
2024 }
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