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 * However, the following notice accompanied the original version of this
 * file:
 *
 * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
 *
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package java.time.chrono;

import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoField.NANO_OF_DAY;
import static java.time.temporal.ChronoUnit.FOREVER;
import static java.time.temporal.ChronoUnit.NANOS;

import java.io.Serializable;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalUnit;
import java.time.zone.ZoneRules;
import java.util.Comparator;
import java.util.Objects;


A date-time without a time-zone in an arbitrary chronology, intended
for advanced globalization use cases.


Most applications should declare method signatures, fields and variables as LocalDateTime, not this interface.

 A ChronoLocalDateTime is the abstract representation of a local date-time where the Chronology chronology, or calendar system, is pluggable. The date-time is defined in terms of fields expressed by TemporalField, where most common implementations are defined in ChronoField. The chronology defines how the calendar system operates and the meaning of the standard fields. 
When to use this interface
 The design of the API encourages the use of LocalDateTime rather than this interface, even in the case where the application needs to deal with multiple calendar systems. The rationale for this is explored in detail in ChronoLocalDate. 
 Ensure that the discussion in ChronoLocalDate has been read and understood before using this interface. 
Type parameters:
  • <D> – the concrete type for the date of this date-time
Implementation Requirements:
This interface must be implemented with care to ensure other classes operate correctly.
All implementations that can be instantiated must be final, immutable and thread-safe.
Subclasses should be Serializable wherever possible.
Since:1.8
/**
 * A date-time without a time-zone in an arbitrary chronology, intended
 * for advanced globalization use cases.
 * <p>
 * <b>Most applications should declare method signatures, fields and variables
 * as {@link LocalDateTime}, not this interface.</b>
 * <p>
 * A {@code ChronoLocalDateTime} is the abstract representation of a local date-time
 * where the {@code Chronology chronology}, or calendar system, is pluggable.
 * The date-time is defined in terms of fields expressed by {@link TemporalField},
 * where most common implementations are defined in {@link ChronoField}.
 * The chronology defines how the calendar system operates and the meaning of
 * the standard fields.
 *
 * <h3>When to use this interface</h3>
 * The design of the API encourages the use of {@code LocalDateTime} rather than this
 * interface, even in the case where the application needs to deal with multiple
 * calendar systems. The rationale for this is explored in detail in {@link ChronoLocalDate}.
 * <p>
 * Ensure that the discussion in {@code ChronoLocalDate} has been read and understood
 * before using this interface.
 *
 * @implSpec
 * This interface must be implemented with care to ensure other classes operate correctly.
 * All implementations that can be instantiated must be final, immutable and thread-safe.
 * Subclasses should be Serializable wherever possible.
 *
 * @param <D> the concrete type for the date of this date-time
 * @since 1.8
 */
public interface ChronoLocalDateTime<D extends ChronoLocalDate>
        extends Temporal, TemporalAdjuster, Comparable<ChronoLocalDateTime<?>> {

    
Gets a comparator that compares ChronoLocalDateTime in time-line order ignoring the chronology. 
 This comparator differs from the comparison in compareTo in that it only compares the underlying date-time and not the chronology. This allows dates in different calendar systems to be compared based on the position of the date-time on the local time-line. The underlying comparison is equivalent to comparing the epoch-day and nano-of-day. 
See Also:
Returns:a comparator that compares in time-line order ignoring the chronology
/**
     * Gets a comparator that compares {@code ChronoLocalDateTime} in
     * time-line order ignoring the chronology.
     * <p>
     * This comparator differs from the comparison in {@link #compareTo} in that it
     * only compares the underlying date-time and not the chronology.
     * This allows dates in different calendar systems to be compared based
     * on the position of the date-time on the local time-line.
     * The underlying comparison is equivalent to comparing the epoch-day and nano-of-day.
     *
     * @return a comparator that compares in time-line order ignoring the chronology
     * @see #isAfter
     * @see #isBefore
     * @see #isEqual
     */
    static Comparator<ChronoLocalDateTime<?>> timeLineOrder() {
        return (Comparator<ChronoLocalDateTime<? extends ChronoLocalDate>> & Serializable) (dateTime1, dateTime2) -> {
            int cmp = Long.compare(dateTime1.toLocalDate().toEpochDay(), dateTime2.toLocalDate().toEpochDay());
            if (cmp == 0) {
                cmp = Long.compare(dateTime1.toLocalTime().toNanoOfDay(), dateTime2.toLocalTime().toNanoOfDay());
            }
            return cmp;
        };
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of ChronoLocalDateTime from a temporal object. 
 This obtains a local date-time based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDateTime. 
 The conversion extracts and combines the chronology and the date-time from the temporal object. The behavior is equivalent to using Chronology.localDateTime(TemporalAccessor) with the extracted chronology. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. 
 This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, ChronoLocalDateTime::from. 
Params:
  • temporal –  the temporal object to convert, not null
Throws:
See Also:
Returns:the date-time, not null
/**
     * Obtains an instance of {@code ChronoLocalDateTime} from a temporal object.
     * <p>
     * This obtains a local date-time based on the specified temporal.
     * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
     * which this factory converts to an instance of {@code ChronoLocalDateTime}.
     * <p>
     * The conversion extracts and combines the chronology and the date-time
     * from the temporal object. The behavior is equivalent to using
     * {@link Chronology#localDateTime(TemporalAccessor)} with the extracted chronology.
     * Implementations are permitted to perform optimizations such as accessing
     * those fields that are equivalent to the relevant objects.
     * <p>
     * This method matches the signature of the functional interface {@link TemporalQuery}
     * allowing it to be used as a query via method reference, {@code ChronoLocalDateTime::from}.
     *
     * @param temporal  the temporal object to convert, not null
     * @return the date-time, not null
     * @throws DateTimeException if unable to convert to a {@code ChronoLocalDateTime}
     * @see Chronology#localDateTime(TemporalAccessor)
     */
    static ChronoLocalDateTime<?> from(TemporalAccessor temporal) {
        if (temporal instanceof ChronoLocalDateTime) {
            return (ChronoLocalDateTime<?>) temporal;
        }
        Objects.requireNonNull(temporal, "temporal");
        Chronology chrono = temporal.query(TemporalQueries.chronology());
        if (chrono == null) {
            throw new DateTimeException("Unable to obtain ChronoLocalDateTime from TemporalAccessor: " + temporal.getClass());
        }
        return chrono.localDateTime(temporal);
    }

    //-----------------------------------------------------------------------
    
Gets the chronology of this date-time.

 The Chronology represents the calendar system in use. The era and other fields in ChronoField are defined by the chronology. 
Returns:the chronology, not null
/**
     * Gets the chronology of this date-time.
     * <p>
     * The {@code Chronology} represents the calendar system in use.
     * The era and other fields in {@link ChronoField} are defined by the chronology.
     *
     * @return the chronology, not null
     */
    default Chronology getChronology() {
        return toLocalDate().getChronology();
    }

    
Gets the local date part of this date-time.


This returns a local date with the same year, month and day
as this date-time.

Returns:the date part of this date-time, not null
/**
     * Gets the local date part of this date-time.
     * <p>
     * This returns a local date with the same year, month and day
     * as this date-time.
     *
     * @return the date part of this date-time, not null
     */
    D toLocalDate();

    
Gets the local time part of this date-time.


This returns a local time with the same hour, minute, second and
nanosecond as this date-time.

Returns:the time part of this date-time, not null
/**
     * Gets the local time part of this date-time.
     * <p>
     * This returns a local time with the same hour, minute, second and
     * nanosecond as this date-time.
     *
     * @return the time part of this date-time, not null
     */
    LocalTime toLocalTime();

    
Checks if the specified field is supported.

 This checks if the specified field can be queried on this date-time. If false, then calling the range, get and with(TemporalField, long) methods will throw an exception. 
 The set of supported fields is defined by the chronology and normally includes all ChronoField date and time fields. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument. Whether the field is supported is determined by the field. 
Params:
  • field –  the field to check, null returns false
Returns:true if the field can be queried, false if not
/**
     * Checks if the specified field is supported.
     * <p>
     * This checks if the specified field can be queried on this date-time.
     * If false, then calling the {@link #range(TemporalField) range},
     * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
     * methods will throw an exception.
     * <p>
     * The set of supported fields is defined by the chronology and normally includes
     * all {@code ChronoField} date and time fields.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
     * passing {@code this} as the argument.
     * Whether the field is supported is determined by the field.
     *
     * @param field  the field to check, null returns false
     * @return true if the field can be queried, false if not
     */
    @Override
    boolean isSupported(TemporalField field);

    
Checks if the specified unit is supported.

 This checks if the specified unit can be added to or subtracted from this date-time. If false, then calling the plus(long, TemporalUnit) and minus methods will throw an exception. 
 The set of supported units is defined by the chronology and normally includes all ChronoUnit units except FOREVER. 
 If the unit is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.isSupportedBy(Temporal) passing this as the argument. Whether the unit is supported is determined by the unit. 
Params:
  • unit –  the unit to check, null returns false
Returns:true if the unit can be added/subtracted, false if not
/**
     * Checks if the specified unit is supported.
     * <p>
     * This checks if the specified unit can be added to or subtracted from this date-time.
     * If false, then calling the {@link #plus(long, TemporalUnit)} and
     * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
     * <p>
     * The set of supported units is defined by the chronology and normally includes
     * all {@code ChronoUnit} units except {@code FOREVER}.
     * <p>
     * If the unit is not a {@code ChronoUnit}, then the result of this method
     * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
     * passing {@code this} as the argument.
     * Whether the unit is supported is determined by the unit.
     *
     * @param unit  the unit to check, null returns false
     * @return true if the unit can be added/subtracted, false if not
     */
    @Override
    default boolean isSupported(TemporalUnit unit) {
        if (unit instanceof ChronoUnit) {
            return unit != FOREVER;
        }
        return unit != null && unit.isSupportedBy(this);
    }

    //-----------------------------------------------------------------------
    // override for covariant return type
    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    default ChronoLocalDateTime<D> with(TemporalAdjuster adjuster) {
        return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.with(adjuster));
    }

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    ChronoLocalDateTime<D> with(TemporalField field, long newValue);

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    default ChronoLocalDateTime<D> plus(TemporalAmount amount) {
        return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.plus(amount));
    }

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    ChronoLocalDateTime<D> plus(long amountToAdd, TemporalUnit unit);

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    default ChronoLocalDateTime<D> minus(TemporalAmount amount) {
        return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amount));
    }

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    default ChronoLocalDateTime<D> minus(long amountToSubtract, TemporalUnit unit) {
        return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amountToSubtract, unit));
    }

    //-----------------------------------------------------------------------
    
Queries this date-time using the specified query.

 This queries this date-time using the specified query strategy object. The TemporalQuery object defines the logic to be used to obtain the result. Read the documentation of the query to understand what the result of this method will be. 
 The result of this method is obtained by invoking the TemporalQuery.queryFrom(TemporalAccessor) method on the specified query passing this as the argument. 
Params:
  • query –  the query to invoke, not null
Type parameters:
  • <R> – the type of the result
Throws:
Returns:the query result, null may be returned (defined by the query)
/**
     * Queries this date-time using the specified query.
     * <p>
     * This queries this date-time using the specified query strategy object.
     * The {@code TemporalQuery} object defines the logic to be used to
     * obtain the result. Read the documentation of the query to understand
     * what the result of this method will be.
     * <p>
     * The result of this method is obtained by invoking the
     * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
     * specified query passing {@code this} as the argument.
     *
     * @param <R> the type of the result
     * @param query  the query to invoke, not null
     * @return the query result, null may be returned (defined by the query)
     * @throws DateTimeException if unable to query (defined by the query)
     * @throws ArithmeticException if numeric overflow occurs (defined by the query)
     */
    @SuppressWarnings("unchecked")
    @Override
    default <R> R query(TemporalQuery<R> query) {
        if (query == TemporalQueries.zoneId() || query == TemporalQueries.zone() || query == TemporalQueries.offset()) {
            return null;
        } else if (query == TemporalQueries.localTime()) {
            return (R) toLocalTime();
        } else if (query == TemporalQueries.chronology()) {
            return (R) getChronology();
        } else if (query == TemporalQueries.precision()) {
            return (R) NANOS;
        }
        // inline TemporalAccessor.super.query(query) as an optimization
        // non-JDK classes are not permitted to make this optimization
        return query.queryFrom(this);
    }

    
Adjusts the specified temporal object to have the same date and time as this object.


This returns a temporal object of the same observable type as the input
with the date and time changed to be the same as this.

 The adjustment is equivalent to using Temporal.with(TemporalField, long) twice, passing ChronoField.EPOCH_DAY and ChronoField.NANO_OF_DAY as the fields. 
 In most cases, it is clearer to reverse the calling pattern by using Temporal.with(TemporalAdjuster): 
  // these two lines are equivalent, but the second approach is recommended
  temporal = thisLocalDateTime.adjustInto(temporal);
  temporal = temporal.with(thisLocalDateTime);




This instance is immutable and unaffected by this method call.

Params:
  • temporal –  the target object to be adjusted, not null
Throws:
Returns:the adjusted object, not null
/**
     * Adjusts the specified temporal object to have the same date and time as this object.
     * <p>
     * This returns a temporal object of the same observable type as the input
     * with the date and time changed to be the same as this.
     * <p>
     * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
     * twice, passing {@link ChronoField#EPOCH_DAY} and
     * {@link ChronoField#NANO_OF_DAY} as the fields.
     * <p>
     * In most cases, it is clearer to reverse the calling pattern by using
     * {@link Temporal#with(TemporalAdjuster)}:
     * <pre>
     *   // these two lines are equivalent, but the second approach is recommended
     *   temporal = thisLocalDateTime.adjustInto(temporal);
     *   temporal = temporal.with(thisLocalDateTime);
     * </pre>
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param temporal  the target object to be adjusted, not null
     * @return the adjusted object, not null
     * @throws DateTimeException if unable to make the adjustment
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    default Temporal adjustInto(Temporal temporal) {
        return temporal
                .with(EPOCH_DAY, toLocalDate().toEpochDay())
                .with(NANO_OF_DAY, toLocalTime().toNanoOfDay());
    }

    
Formats this date-time using the specified formatter.


This date-time will be passed to the formatter to produce a string.


The default implementation must behave as follows:

 return formatter.format(this);



Params:
  • formatter –  the formatter to use, not null
Throws:
Returns:the formatted date-time string, not null
/**
     * Formats this date-time using the specified formatter.
     * <p>
     * This date-time will be passed to the formatter to produce a string.
     * <p>
     * The default implementation must behave as follows:
     * <pre>
     *  return formatter.format(this);
     * </pre>
     *
     * @param formatter  the formatter to use, not null
     * @return the formatted date-time string, not null
     * @throws DateTimeException if an error occurs during printing
     */
    default String format(DateTimeFormatter formatter) {
        Objects.requireNonNull(formatter, "formatter");
        return formatter.format(this);
    }

    //-----------------------------------------------------------------------
    
Combines this time with a time-zone to create a ChronoZonedDateTime. 
 This returns a ChronoZonedDateTime formed from this date-time at the specified time-zone. The result will match this date-time as closely as possible. Time-zone rules, such as daylight savings, mean that not every local date-time is valid for the specified zone, thus the local date-time may be adjusted. 
 The local date-time is resolved to a single instant on the time-line. This is achieved by finding a valid offset from UTC/Greenwich for the local date-time as defined by the rules of the zone ID. 

In most cases, there is only one valid offset for a local date-time.
In the case of an overlap, where clocks are set back, there are two valid offsets.
This method uses the earlier offset typically corresponding to "summer".


In the case of a gap, where clocks jump forward, there is no valid offset.
Instead, the local date-time is adjusted to be later by the length of the gap.
For a typical one hour daylight savings change, the local date-time will be
moved one hour later into the offset typically corresponding to "summer".

 To obtain the later offset during an overlap, call ChronoZonedDateTime.withLaterOffsetAtOverlap() on the result of this method. 
Params:
  • zone –  the time-zone to use, not null
Returns:the zoned date-time formed from this date-time, not null
/**
     * Combines this time with a time-zone to create a {@code ChronoZonedDateTime}.
     * <p>
     * This returns a {@code ChronoZonedDateTime} formed from this date-time at the
     * specified time-zone. The result will match this date-time as closely as possible.
     * Time-zone rules, such as daylight savings, mean that not every local date-time
     * is valid for the specified zone, thus the local date-time may be adjusted.
     * <p>
     * The local date-time is resolved to a single instant on the time-line.
     * This is achieved by finding a valid offset from UTC/Greenwich for the local
     * date-time as defined by the {@link ZoneRules rules} of the zone ID.
     *<p>
     * In most cases, there is only one valid offset for a local date-time.
     * In the case of an overlap, where clocks are set back, there are two valid offsets.
     * This method uses the earlier offset typically corresponding to "summer".
     * <p>
     * In the case of a gap, where clocks jump forward, there is no valid offset.
     * Instead, the local date-time is adjusted to be later by the length of the gap.
     * For a typical one hour daylight savings change, the local date-time will be
     * moved one hour later into the offset typically corresponding to "summer".
     * <p>
     * To obtain the later offset during an overlap, call
     * {@link ChronoZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method.
     *
     * @param zone  the time-zone to use, not null
     * @return the zoned date-time formed from this date-time, not null
     */
    ChronoZonedDateTime<D> atZone(ZoneId zone);

    //-----------------------------------------------------------------------
    
Converts this date-time to an Instant. 
 This combines this local date-time and the specified offset to form an Instant. 

This default implementation calculates from the epoch-day of the date and the
second-of-day of the time.

Params:
  • offset –  the offset to use for the conversion, not null
Returns:an Instant representing the same instant, not null
/**
     * Converts this date-time to an {@code Instant}.
     * <p>
     * This combines this local date-time and the specified offset to form
     * an {@code Instant}.
     * <p>
     * This default implementation calculates from the epoch-day of the date and the
     * second-of-day of the time.
     *
     * @param offset  the offset to use for the conversion, not null
     * @return an {@code Instant} representing the same instant, not null
     */
    default Instant toInstant(ZoneOffset offset) {
        return Instant.ofEpochSecond(toEpochSecond(offset), toLocalTime().getNano());
    }

    
Converts this date-time to the number of seconds from the epoch
of 1970-01-01T00:00:00Z.


This combines this local date-time and the specified offset to calculate the
epoch-second value, which is the number of elapsed seconds from 1970-01-01T00:00:00Z.
Instants on the time-line after the epoch are positive, earlier are negative.


This default implementation calculates from the epoch-day of the date and the
second-of-day of the time.

Params:
  • offset –  the offset to use for the conversion, not null
Returns:the number of seconds from the epoch of 1970-01-01T00:00:00Z
/**
     * Converts this date-time to the number of seconds from the epoch
     * of 1970-01-01T00:00:00Z.
     * <p>
     * This combines this local date-time and the specified offset to calculate the
     * epoch-second value, which is the number of elapsed seconds from 1970-01-01T00:00:00Z.
     * Instants on the time-line after the epoch are positive, earlier are negative.
     * <p>
     * This default implementation calculates from the epoch-day of the date and the
     * second-of-day of the time.
     *
     * @param offset  the offset to use for the conversion, not null
     * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z
     */
    default long toEpochSecond(ZoneOffset offset) {
        Objects.requireNonNull(offset, "offset");
        long epochDay = toLocalDate().toEpochDay();
        long secs = epochDay * 86400 + toLocalTime().toSecondOfDay();
        secs -= offset.getTotalSeconds();
        return secs;
    }

    //-----------------------------------------------------------------------
    
Compares this date-time to another date-time, including the chronology.

 The comparison is based first on the underlying time-line date-time, then on the chronology. It is "consistent with equals", as defined by Comparable. 

For example, the following is the comparator order:

    

  1. 2012-12-03T12:00 (ISO)
    2. 

  2. 2012-12-04T12:00 (ISO)
    3. 

  3. 2555-12-04T12:00 (ThaiBuddhist)
    4. 

  4. 2012-12-05T12:00 (ISO)
    5. 


Values #2 and #3 represent the same date-time on the time-line.
When two values represent the same date-time, the chronology ID is compared to distinguish them.
This step is needed to make the ordering "consistent with equals".


If all the date-time objects being compared are in the same chronology, then the
additional chronology stage is not required and only the local date-time is used.


This default implementation performs the comparison defined above.

Params:
  • other –  the other date-time to compare to, not null
Returns:the comparator value, negative if less, positive if greater
/**
     * Compares this date-time to another date-time, including the chronology.
     * <p>
     * The comparison is based first on the underlying time-line date-time, then
     * on the chronology.
     * It is "consistent with equals", as defined by {@link Comparable}.
     * <p>
     * For example, the following is the comparator order:
     * <ol>
     * <li>{@code 2012-12-03T12:00 (ISO)}</li>
     * <li>{@code 2012-12-04T12:00 (ISO)}</li>
     * <li>{@code 2555-12-04T12:00 (ThaiBuddhist)}</li>
     * <li>{@code 2012-12-05T12:00 (ISO)}</li>
     * </ol>
     * Values #2 and #3 represent the same date-time on the time-line.
     * When two values represent the same date-time, the chronology ID is compared to distinguish them.
     * This step is needed to make the ordering "consistent with equals".
     * <p>
     * If all the date-time objects being compared are in the same chronology, then the
     * additional chronology stage is not required and only the local date-time is used.
     * <p>
     * This default implementation performs the comparison defined above.
     *
     * @param other  the other date-time to compare to, not null
     * @return the comparator value, negative if less, positive if greater
     */
    @Override
    default int compareTo(ChronoLocalDateTime<?> other) {
        int cmp = toLocalDate().compareTo(other.toLocalDate());
        if (cmp == 0) {
            cmp = toLocalTime().compareTo(other.toLocalTime());
            if (cmp == 0) {
                cmp = getChronology().compareTo(other.getChronology());
            }
        }
        return cmp;
    }

    
Checks if this date-time is after the specified date-time ignoring the chronology.

 This method differs from the comparison in compareTo in that it only compares the underlying date-time and not the chronology. This allows dates in different calendar systems to be compared based on the time-line position. 

This default implementation performs the comparison based on the epoch-day
and nano-of-day.

Params:
  • other –  the other date-time to compare to, not null
Returns:true if this is after the specified date-time
/**
     * Checks if this date-time is after the specified date-time ignoring the chronology.
     * <p>
     * This method differs from the comparison in {@link #compareTo} in that it
     * only compares the underlying date-time and not the chronology.
     * This allows dates in different calendar systems to be compared based
     * on the time-line position.
     * <p>
     * This default implementation performs the comparison based on the epoch-day
     * and nano-of-day.
     *
     * @param other  the other date-time to compare to, not null
     * @return true if this is after the specified date-time
     */
    default boolean isAfter(ChronoLocalDateTime<?> other) {
        long thisEpDay = this.toLocalDate().toEpochDay();
        long otherEpDay = other.toLocalDate().toEpochDay();
        return thisEpDay > otherEpDay ||
            (thisEpDay == otherEpDay && this.toLocalTime().toNanoOfDay() > other.toLocalTime().toNanoOfDay());
    }

    
Checks if this date-time is before the specified date-time ignoring the chronology.

 This method differs from the comparison in compareTo in that it only compares the underlying date-time and not the chronology. This allows dates in different calendar systems to be compared based on the time-line position. 

This default implementation performs the comparison based on the epoch-day
and nano-of-day.

Params:
  • other –  the other date-time to compare to, not null
Returns:true if this is before the specified date-time
/**
     * Checks if this date-time is before the specified date-time ignoring the chronology.
     * <p>
     * This method differs from the comparison in {@link #compareTo} in that it
     * only compares the underlying date-time and not the chronology.
     * This allows dates in different calendar systems to be compared based
     * on the time-line position.
     * <p>
     * This default implementation performs the comparison based on the epoch-day
     * and nano-of-day.
     *
     * @param other  the other date-time to compare to, not null
     * @return true if this is before the specified date-time
     */
    default boolean isBefore(ChronoLocalDateTime<?> other) {
        long thisEpDay = this.toLocalDate().toEpochDay();
        long otherEpDay = other.toLocalDate().toEpochDay();
        return thisEpDay < otherEpDay ||
            (thisEpDay == otherEpDay && this.toLocalTime().toNanoOfDay() < other.toLocalTime().toNanoOfDay());
    }

    
Checks if this date-time is equal to the specified date-time ignoring the chronology.

 This method differs from the comparison in compareTo in that it only compares the underlying date and time and not the chronology. This allows date-times in different calendar systems to be compared based on the time-line position. 

This default implementation performs the comparison based on the epoch-day
and nano-of-day.

Params:
  • other –  the other date-time to compare to, not null
Returns:true if the underlying date-time is equal to the specified date-time on the timeline
/**
     * Checks if this date-time is equal to the specified date-time ignoring the chronology.
     * <p>
     * This method differs from the comparison in {@link #compareTo} in that it
     * only compares the underlying date and time and not the chronology.
     * This allows date-times in different calendar systems to be compared based
     * on the time-line position.
     * <p>
     * This default implementation performs the comparison based on the epoch-day
     * and nano-of-day.
     *
     * @param other  the other date-time to compare to, not null
     * @return true if the underlying date-time is equal to the specified date-time on the timeline
     */
    default boolean isEqual(ChronoLocalDateTime<?> other) {
        // Do the time check first, it is cheaper than computing EPOCH day.
        return this.toLocalTime().toNanoOfDay() == other.toLocalTime().toNanoOfDay() &&
               this.toLocalDate().toEpochDay() == other.toLocalDate().toEpochDay();
    }

    
Checks if this date-time is equal to another date-time, including the chronology.


Compares this date-time with another ensuring that the date-time and chronology are the same.

Params:
  • obj –  the object to check, null returns false
Returns:true if this is equal to the other date
/**
     * Checks if this date-time is equal to another date-time, including the chronology.
     * <p>
     * Compares this date-time with another ensuring that the date-time and chronology are the same.
     *
     * @param obj  the object to check, null returns false
     * @return true if this is equal to the other date
     */
    @Override
    boolean equals(Object obj);

    
A hash code for this date-time.

Returns:a suitable hash code
/**
     * A hash code for this date-time.
     *
     * @return a suitable hash code
     */
    @Override
    int hashCode();

    //-----------------------------------------------------------------------
    
Outputs this date-time as a String. 

The output will include the full local date-time.

Returns:a string representation of this date-time, not null
/**
     * Outputs this date-time as a {@code String}.
     * <p>
     * The output will include the full local date-time.
     *
     * @return a string representation of this date-time, not null
     */
    @Override
    String toString();

}