ChronoZonedDateTime

compareTo

public int compareTo (ChronoZonedDateTime<?> other)

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

The comparison is based first on the instant, then on the local date-time, then on the zone ID, then on the chronology. It is "consistent with equals", as defined by Comparable.

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

This default implementation performs the comparison defined above.

equals

public abstract boolean equals (Object obj)

Checks if this date-time is equal to another date-time.

The comparison is based on the offset date-time and the zone. To compare for the same instant on the time-line, use Comparable.compareTo(T). Only objects of type ChronoZonedDateTime are compared, other types return false.

format

public String format (DateTimeFormatter formatter)

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);
 

from

public static ChronoZonedDateTime<?> from (TemporalAccessor temporal)

Obtains an instance of ChronoZonedDateTime from a temporal object.

This creates a zoned 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 ChronoZonedDateTime.

The conversion extracts and combines the chronology, date, time and zone from the temporal object. The behavior is equivalent to using Chronology.zonedDateTime(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, ChronoZonedDateTime::from.

get

public int get (TemporalField field)

Gets the value of the specified field as an int.

This queries the date-time for the value of the specified field. The returned value will always be within the valid range of values for the field. If the date-time cannot return the value, because the field is unsupported or for some other reason, an exception will be thrown.

getChronology

public Chronology getChronology ()

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.

getLong

public long getLong (TemporalField field)

Gets the value of the specified field as a long.

This queries the date-time for the value of the specified field. The returned value may be outside the valid range of values for the field. If the date-time cannot return the value, because the field is unsupported or for some other reason, an exception will be thrown.

getOffset

public abstract ZoneOffset getOffset ()

Gets the zone offset, such as '+01:00'.

This is the offset of the local date-time from UTC/Greenwich.

getZone

public abstract ZoneId getZone ()

Gets the zone ID, such as 'Europe/Paris'.

This returns the stored time-zone id used to determine the time-zone rules.

hashCode

public abstract int hashCode ()

A hash code for this date-time.

isAfter

public boolean isAfter (ChronoZonedDateTime<?> other)

Checks if the instant of this date-time is after that of the specified date-time.

This method differs from the comparison in Comparable.compareTo(T) in that it only compares the instant of the date-time. This is equivalent to using dateTime1.toInstant().isAfter(dateTime2.toInstant());.

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

isBefore

public boolean isBefore (ChronoZonedDateTime<?> other)

Checks if the instant of this date-time is before that of the specified date-time.

This method differs from the comparison in Comparable.compareTo(T) in that it only compares the instant of the date-time. This is equivalent to using dateTime1.toInstant().isBefore(dateTime2.toInstant());.

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

isEqual

public boolean isEqual (ChronoZonedDateTime<?> other)

Checks if the instant of this date-time is equal to that of the specified date-time.

This method differs from the comparison in Comparable.compareTo(T) and equals(Object) in that it only compares the instant of the date-time. This is equivalent to using dateTime1.toInstant().equals(dateTime2.toInstant());.

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

isSupported

public boolean isSupported (TemporalUnit unit)

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, java.time.temporal.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.

isSupported

public abstract boolean isSupported (TemporalField field)

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(java.time.temporal.TemporalField, long) methods will throw an exception.

The set of supported fields is defined by the chronology and normally includes all ChronoField 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.

minus

public ChronoZonedDateTime<D> minus (TemporalAmount amount)

Returns an object of the same type as this object with an amount subtracted.

This adjusts this temporal, subtracting according to the rules of the specified amount. The amount is typically a Period but may be any other type implementing the TemporalAmount interface, such as Duration.

Some example code indicating how and why this method is used:

  date = date.minus(period);               // subtract a Period instance
  date = date.minus(duration);             // subtract a Duration instance
  date = date.minus(workingDays(6));       // example user-written workingDays method
 

Note that calling plus followed by minus is not guaranteed to return the same date-time.

minus

public ChronoZonedDateTime<D> minus (long amountToSubtract, 
                TemporalUnit unit)

Returns an object of the same type as this object with the specified period subtracted.

This method returns a new object based on this one with the specified period subtracted. For example, on a LocalDate, this could be used to subtract a number of years, months or days. The returned object will have the same observable type as this object.

In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st March, then subtracting one month would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.

plus

public ChronoZonedDateTime<D> plus (TemporalAmount amount)

Returns an object of the same type as this object with an amount added.

This adjusts this temporal, adding according to the rules of the specified amount. The amount is typically a Period but may be any other type implementing the TemporalAmount interface, such as Duration.

Some example code indicating how and why this method is used:

  date = date.plus(period);                // add a Period instance
  date = date.plus(duration);              // add a Duration instance
  date = date.plus(workingDays(6));        // example user-written workingDays method
 

Note that calling plus followed by minus is not guaranteed to return the same date-time.

plus

public abstract ChronoZonedDateTime<D> plus (long amountToAdd, 
                TemporalUnit unit)

Returns an object of the same type as this object with the specified period added.

This method returns a new object based on this one with the specified period added. For example, on a LocalDate, this could be used to add a number of years, months or days. The returned object will have the same observable type as this object.

In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st January, then adding one month would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.

query

public R query (TemporalQuery<R> query)

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.

range

public ValueRange range (TemporalField field)

Gets the range of valid values for the specified field.

All fields can be expressed as a long integer. This method returns an object that describes the valid range for that value. The value of this temporal object is used to enhance the accuracy of the returned range. If the date-time cannot return the range, because the field is unsupported or for some other reason, an exception will be thrown.

Note that the result only describes the minimum and maximum valid values and it is important not to read too much into them. For example, there could be values within the range that are invalid for the field.

timeLineOrder

public static Comparator<ChronoZonedDateTime<?>> timeLineOrder ()

Gets a comparator that compares ChronoZonedDateTime in time-line order ignoring the chronology.

This comparator differs from the comparison in Comparable.compareTo(T) in that it only compares the underlying instant and not the chronology. This allows dates in different calendar systems to be compared based on the position of the date-time on the instant time-line. The underlying comparison is equivalent to comparing the epoch-second and nano-of-second.

toEpochSecond

public long toEpochSecond ()

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

This uses the local date-time and 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.

toInstant

public Instant toInstant ()

Converts this date-time to an Instant.

This returns an Instant representing the same point on the time-line as this date-time. The calculation combines the local date-time and offset.

toLocalDate

public D toLocalDate ()

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.

toLocalDateTime

public abstract ChronoLocalDateTime<D> toLocalDateTime ()

Gets the local date-time part of this date-time.

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

toLocalTime

public LocalTime toLocalTime ()

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.

toString

public abstract String toString ()

Outputs this date-time as a String.

The output will include the full zoned date-time.

with

public abstract ChronoZonedDateTime<D> with (TemporalField field, 
                long newValue)

Returns an object of the same type as this object with the specified field altered.

This returns a new object based on this one with the value for the specified field changed. For example, on a LocalDate, this could be used to set the year, month or day-of-month. The returned object will have the same observable type as this object.

In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st January, then changing the month to February would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.

with

public ChronoZonedDateTime<D> with (TemporalAdjuster adjuster)

Returns an adjusted object of the same type as this object with the adjustment made.

This adjusts this date-time according to the rules of the specified adjuster. A simple adjuster might simply set the one of the fields, such as the year field. A more complex adjuster might set the date to the last day of the month. A selection of common adjustments is provided in TemporalAdjusters. These include finding the "last day of the month" and "next Wednesday". The adjuster is responsible for handling special cases, such as the varying lengths of month and leap years.

Some example code indicating how and why this method is used:

  date = date.with(Month.JULY);        // most key classes implement TemporalAdjuster
  date = date.with(lastDayOfMonth());  // static import from Adjusters
  date = date.with(next(WEDNESDAY));   // static import from Adjusters and DayOfWeek
 

withEarlierOffsetAtOverlap

public abstract ChronoZonedDateTime<D> withEarlierOffsetAtOverlap ()

Returns a copy of this date-time changing the zone offset to the earlier of the two valid offsets at a local time-line overlap.

This method only has any effect when the local time-line overlaps, such as at an autumn daylight savings cutover. In this scenario, there are two valid offsets for the local date-time. Calling this method will return a zoned date-time with the earlier of the two selected.

If this method is called when it is not an overlap, this is returned.

This instance is immutable and unaffected by this method call.

withLaterOffsetAtOverlap

public abstract ChronoZonedDateTime<D> withLaterOffsetAtOverlap ()

Returns a copy of this date-time changing the zone offset to the later of the two valid offsets at a local time-line overlap.

This method only has any effect when the local time-line overlaps, such as at an autumn daylight savings cutover. In this scenario, there are two valid offsets for the local date-time. Calling this method will return a zoned date-time with the later of the two selected.

If this method is called when it is not an overlap, this is returned.

This instance is immutable and unaffected by this method call.

withZoneSameInstant

public abstract ChronoZonedDateTime<D> withZoneSameInstant (ZoneId zone)

Returns a copy of this date-time with a different time-zone, retaining the instant.

This method changes the time-zone and retains the instant. This normally results in a change to the local date-time.

This method is based on retaining the same instant, thus gaps and overlaps in the local time-line have no effect on the result.

To change the offset while keeping the local time, use withZoneSameLocal(java.time.ZoneId).

withZoneSameLocal

public abstract ChronoZonedDateTime<D> withZoneSameLocal (ZoneId zone)

Returns a copy of this date-time with a different time-zone, retaining the local date-time if possible.

This method changes the time-zone and retains the local date-time. The local date-time is only changed if it is invalid for the new zone.

To change the zone and adjust the local date-time, use withZoneSameInstant(java.time.ZoneId).

This instance is immutable and unaffected by this method call.