# Uses of Class
java.time.ZoneId

Packages that use ZoneId
Package
Description
java.time
The main API for dates, times, instants, and durations.
java.time.chrono
Generic API for calendar systems other than the default ISO.
java.time.format
Provides classes to print and parse dates and times.
java.time.temporal
Access to date and time using fields and units, and date time adjusters.
java.util
Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.

## Uses of ZoneId in java.time

Subclasses of ZoneId in java.time
Modifier and Type
Class
Description
`final class`
`ZoneOffset`
A time-zone offset from Greenwich/UTC, such as `+02:00`.
Methods in java.time that return ZoneId
Modifier and Type
Method
Description
`static ZoneId`
ZoneId.`from(TemporalAccessor temporal)`
Obtains an instance of `ZoneId` from a temporal object.
`abstract ZoneId`
Clock.`getZone()`
Gets the time-zone being used to create dates and times.
`ZoneId`
ZonedDateTime.`getZone()`
Gets the time-zone, such as 'Europe/Paris'.
`ZoneId`
ZoneId.`normalized()`
Normalizes the time-zone ID, returning a `ZoneOffset` where possible.
`static ZoneId`
ZoneId.`of(String zoneId)`
Obtains an instance of `ZoneId` from an ID ensuring that the ID is valid and available for use.
`static ZoneId`
ZoneId.`of(String zoneId, Map<String,String> aliasMap)`
Obtains an instance of `ZoneId` using its ID using a map of aliases to supplement the standard zone IDs.
`static ZoneId`
ZoneId.`ofOffset(String prefix, ZoneOffset offset)`
Obtains an instance of `ZoneId` wrapping an offset.
`static ZoneId`
ZoneId.`systemDefault()`
Gets the system default time-zone.
Methods in java.time with parameters of type ZoneId
Modifier and Type
Method
Description
`ZonedDateTime`
LocalDate.`atStartOfDay(ZoneId zone)`
Returns a zoned date-time from this date at the earliest valid time according to the rules in the time-zone.
`ZonedDateTime`
Instant.`atZone(ZoneId zone)`
Combines this instant with a time-zone to create a `ZonedDateTime`.
`ZonedDateTime`
LocalDateTime.`atZone(ZoneId zone)`
Combines this date-time with a time-zone to create a `ZonedDateTime`.
`ZonedDateTime`
OffsetDateTime.`atZoneSameInstant(ZoneId zone)`
Combines this date-time with a time-zone to create a `ZonedDateTime` ensuring that the result has the same instant.
`ZonedDateTime`
OffsetDateTime.`atZoneSimilarLocal(ZoneId zone)`
Combines this date-time with a time-zone to create a `ZonedDateTime` trying to keep the same local date and time.
`static Clock`
Clock.`fixed(Instant fixedInstant, ZoneId zone)`
Obtains a clock that always returns the same instant.
`static LocalDate`
LocalDate.`now(ZoneId zone)`
Obtains the current date from the system clock in the specified time-zone.
`static LocalDateTime`
LocalDateTime.`now(ZoneId zone)`
Obtains the current date-time from the system clock in the specified time-zone.
`static LocalTime`
LocalTime.`now(ZoneId zone)`
Obtains the current time from the system clock in the specified time-zone.
`static MonthDay`
MonthDay.`now(ZoneId zone)`
Obtains the current month-day from the system clock in the specified time-zone.
`static OffsetDateTime`
OffsetDateTime.`now(ZoneId zone)`
Obtains the current date-time from the system clock in the specified time-zone.
`static OffsetTime`
OffsetTime.`now(ZoneId zone)`
Obtains the current time from the system clock in the specified time-zone.
`static Year`
Year.`now(ZoneId zone)`
Obtains the current year from the system clock in the specified time-zone.
`static YearMonth`
YearMonth.`now(ZoneId zone)`
Obtains the current year-month from the system clock in the specified time-zone.
`static ZonedDateTime`
ZonedDateTime.`now(ZoneId zone)`
Obtains the current date-time from the system clock in the specified time-zone.
`static ZonedDateTime`
ZonedDateTime.`of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond, ZoneId zone)`
Obtains an instance of `ZonedDateTime` from a year, month, day, hour, minute, second, nanosecond and time-zone.
`static ZonedDateTime`
ZonedDateTime.`of(LocalDate date, LocalTime time, ZoneId zone)`
Obtains an instance of `ZonedDateTime` from a local date and time.
`static ZonedDateTime`
ZonedDateTime.`of(LocalDateTime localDateTime, ZoneId zone)`
Obtains an instance of `ZonedDateTime` from a local date-time.
`static LocalDate`
LocalDate.`ofInstant(Instant instant, ZoneId zone)`
Obtains an instance of `LocalDate` from an `Instant` and zone ID.
`static LocalDateTime`
LocalDateTime.`ofInstant(Instant instant, ZoneId zone)`
Obtains an instance of `LocalDateTime` from an `Instant` and zone ID.
`static LocalTime`
LocalTime.`ofInstant(Instant instant, ZoneId zone)`
Obtains an instance of `LocalTime` from an `Instant` and zone ID.
`static OffsetDateTime`
OffsetDateTime.`ofInstant(Instant instant, ZoneId zone)`
Obtains an instance of `OffsetDateTime` from an `Instant` and zone ID.
`static OffsetTime`
OffsetTime.`ofInstant(Instant instant, ZoneId zone)`
Obtains an instance of `OffsetTime` from an `Instant` and zone ID.
`static ZonedDateTime`
ZonedDateTime.`ofInstant(Instant instant, ZoneId zone)`
Obtains an instance of `ZonedDateTime` from an `Instant`.
`static ZonedDateTime`
ZonedDateTime.`ofInstant(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone)`
Obtains an instance of `ZonedDateTime` from the instant formed by combining the local date-time and offset.
`static ZonedDateTime`
ZonedDateTime.`ofLocal(LocalDateTime localDateTime, ZoneId zone, ZoneOffset preferredOffset)`
Obtains an instance of `ZonedDateTime` from a local date-time using the preferred offset if possible.
`static ZonedDateTime`
ZonedDateTime.`ofStrict(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone)`
Obtains an instance of `ZonedDateTime` strictly validating the combination of local date-time, offset and zone ID.
`static Clock`
Clock.`system(ZoneId zone)`
Obtains a clock that returns the current instant using the best available system clock.
`static Clock`
Clock.`tickMillis(ZoneId zone)`
Obtains a clock that returns the current instant ticking in whole milliseconds using the best available system clock.
`static Clock`
Clock.`tickMinutes(ZoneId zone)`
Obtains a clock that returns the current instant ticking in whole minutes using the best available system clock.
`static Clock`
Clock.`tickSeconds(ZoneId zone)`
Obtains a clock that returns the current instant ticking in whole seconds using the best available system clock.
`abstract Clock`
Clock.`withZone(ZoneId zone)`
Returns a copy of this clock with a different time-zone.
`default Clock`
InstantSource.`withZone(ZoneId zone)`
Returns a clock with the specified time-zone.
`ZonedDateTime`
ZonedDateTime.`withZoneSameInstant(ZoneId zone)`
Returns a copy of this date-time with a different time-zone, retaining the instant.
`ZonedDateTime`
ZonedDateTime.`withZoneSameLocal(ZoneId zone)`
Returns a copy of this date-time with a different time-zone, retaining the local date-time if possible.

## Uses of ZoneId in java.time.chrono

Methods in java.time.chrono that return ZoneId
Modifier and Type
Method
Description
`ZoneId`
ChronoZonedDateTime.`getZone()`
Gets the zone ID, such as 'Europe/Paris'.
Methods in java.time.chrono with parameters of type ZoneId
Modifier and Type
Method
Description
`ChronoZonedDateTime<D>`
ChronoLocalDateTime.`atZone(ZoneId zone)`
Combines this time with a time-zone to create a `ChronoZonedDateTime`.
`default ChronoLocalDate`
Chronology.`dateNow(ZoneId zone)`
Obtains the current local date in this chronology from the system clock in the specified time-zone.
`HijrahDate`
HijrahChronology.`dateNow(ZoneId zone)`
`LocalDate`
IsoChronology.`dateNow(ZoneId zone)`
Obtains the current ISO local date from the system clock in the specified time-zone.
`JapaneseDate`
JapaneseChronology.`dateNow(ZoneId zone)`
`MinguoDate`
MinguoChronology.`dateNow(ZoneId zone)`
`ThaiBuddhistDate`
ThaiBuddhistChronology.`dateNow(ZoneId zone)`
`static HijrahDate`
HijrahDate.`now(ZoneId zone)`
Obtains the current `HijrahDate` of the Islamic Umm Al-Qura calendar in the specified time-zone.
`static JapaneseDate`
JapaneseDate.`now(ZoneId zone)`
Obtains the current `JapaneseDate` from the system clock in the specified time-zone.
`static MinguoDate`
MinguoDate.`now(ZoneId zone)`
Obtains the current `MinguoDate` from the system clock in the specified time-zone.
`static ThaiBuddhistDate`
ThaiBuddhistDate.`now(ZoneId zone)`
Obtains the current `ThaiBuddhistDate` from the system clock in the specified time-zone.
`ChronoZonedDateTime<D>`
ChronoZonedDateTime.`withZoneSameInstant(ZoneId zone)`
Returns a copy of this date-time with a different time-zone, retaining the instant.
`ChronoZonedDateTime<D>`
ChronoZonedDateTime.`withZoneSameLocal(ZoneId zone)`
Returns a copy of this date-time with a different time-zone, retaining the local date-time if possible.
`default ChronoZonedDateTime<? extends ChronoLocalDate>`
Chronology.`zonedDateTime(Instant instant, ZoneId zone)`
Obtains a `ChronoZonedDateTime` in this chronology from an `Instant`.
`ChronoZonedDateTime<HijrahDate>`
HijrahChronology.`zonedDateTime(Instant instant, ZoneId zone)`
`ZonedDateTime`
IsoChronology.`zonedDateTime(Instant instant, ZoneId zone)`
Obtains an ISO zoned date-time in this chronology from an `Instant`.
`ChronoZonedDateTime<JapaneseDate>`
JapaneseChronology.`zonedDateTime(Instant instant, ZoneId zone)`
`ChronoZonedDateTime<MinguoDate>`
MinguoChronology.`zonedDateTime(Instant instant, ZoneId zone)`
`ChronoZonedDateTime<ThaiBuddhistDate>`
ThaiBuddhistChronology.`zonedDateTime(Instant instant, ZoneId zone)`

## Uses of ZoneId in java.time.format

Methods in java.time.format that return ZoneId
Modifier and Type
Method
Description
`ZoneId`
DateTimeFormatter.`getZone()`
Gets the overriding zone to be used during formatting.
Methods in java.time.format with parameters of type ZoneId
Modifier and Type
Method
Description
`DateTimeFormatter`
DateTimeFormatter.`withZone(ZoneId zone)`
Returns a copy of this formatter with a new override zone.
Method parameters in java.time.format with type arguments of type ZoneId
Modifier and Type
Method
Description
`DateTimeFormatterBuilder`
DateTimeFormatterBuilder.`appendGenericZoneText(TextStyle textStyle, Set<ZoneId> preferredZones)`
Appends the generic time-zone name, such as 'Pacific Time', to the formatter.
`DateTimeFormatterBuilder`
DateTimeFormatterBuilder.`appendZoneText(TextStyle textStyle, Set<ZoneId> preferredZones)`
Appends the time-zone name, such as 'British Summer Time', to the formatter.

## Uses of ZoneId in java.time.temporal

Methods in java.time.temporal that return types with arguments of type ZoneId
Modifier and Type
Method
Description
`static TemporalQuery<ZoneId>`
TemporalQueries.`zone()`
A lenient query for the `ZoneId`, falling back to the `ZoneOffset`.
`static TemporalQuery<ZoneId>`
TemporalQueries.`zoneId()`
A strict query for the `ZoneId`.

## Uses of ZoneId in java.util

Methods in java.util that return ZoneId
Modifier and Type
Method
Description
`ZoneId`
TimeZone.`toZoneId()`
Converts this `TimeZone` object to a `ZoneId`.
Methods in java.util with parameters of type ZoneId
Modifier and Type
Method
Description
`static TimeZone`
TimeZone.`getTimeZone(ZoneId zoneId)`
Gets the `TimeZone` for the given `zoneId`.