## Uses of Class
java.time.ZoneId

Packages that use ZoneId
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, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).

### Uses of ZoneId in java.time

Subclasses of ZoneId in java.time
`class` `ZoneOffset` A time-zone offset from Greenwich/UTC, such as `+02:00`.

Methods in java.time that return ZoneId
`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
`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` LocalDateTime.`atZone(ZoneId zone)` Combines this date-time with a time-zone to create a `ZonedDateTime`.
`ZonedDateTime` Instant.`atZone(ZoneId zone)` Combines this instant 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 YearMonth` YearMonth.`now(ZoneId zone)` Obtains the current year-month 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 MonthDay` MonthDay.`now(ZoneId zone)` Obtains the current month-day 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 LocalTime` LocalTime.`now(ZoneId zone)` Obtains the current time from the system clock in the specified time-zone.
`static LocalDate` LocalDate.`now(ZoneId zone)` Obtains the current date 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 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 LocalDateTime` LocalDateTime.`ofInstant(Instant instant, ZoneId zone)` Obtains an instance of `LocalDateTime` 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 best available system clock.
`static Clock` Clock.`tickMinutes(ZoneId zone)` Obtains a clock that returns the current instant ticking in whole minutes using best available system clock.
`static Clock` Clock.`tickSeconds(ZoneId zone)` Obtains a clock that returns the current instant ticking in whole seconds using best available system clock.
`abstract Clock` Clock.`withZone(ZoneId zone)` Returns a copy of this clock with a different 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
`ZoneId` ChronoZonedDateTime.`getZone()` Gets the zone ID, such as 'Europe/Paris'.

Methods in java.time.chrono with parameters of type ZoneId
`ChronoZonedDateTime<D>` ChronoLocalDateTime.`atZone(ZoneId zone)` Combines this time with a time-zone to create a `ChronoZonedDateTime`.
`JapaneseDate` JapaneseChronology.`dateNow(ZoneId zone)`
`HijrahDate` HijrahChronology.`dateNow(ZoneId zone)`
`MinguoDate` MinguoChronology.`dateNow(ZoneId zone)`
`LocalDate` IsoChronology.`dateNow(ZoneId zone)` Obtains the current ISO local date from the system clock in the specified time-zone.
`ThaiBuddhistDate` ThaiBuddhistChronology.`dateNow(ZoneId zone)`
`default ChronoLocalDate` Chronology.`dateNow(ZoneId zone)` Obtains the current local date in this chronology 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 JapaneseDate` JapaneseDate.`now(ZoneId zone)` Obtains the current `JapaneseDate` from the system clock in the specified time-zone.
`static HijrahDate` HijrahDate.`now(ZoneId zone)` Obtains the current `HijrahDate` of the Islamic Umm Al-Qura calendar 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.
`ChronoZonedDateTime<JapaneseDate>` JapaneseChronology.`zonedDateTime(Instant instant, ZoneId zone)`
`ChronoZonedDateTime<HijrahDate>` HijrahChronology.`zonedDateTime(Instant instant, ZoneId zone)`
`ChronoZonedDateTime<MinguoDate>` MinguoChronology.`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<ThaiBuddhistDate>` ThaiBuddhistChronology.`zonedDateTime(Instant instant, ZoneId zone)`
`default ChronoZonedDateTime<? extends ChronoLocalDate>` Chronology.`zonedDateTime(Instant instant, ZoneId zone)` Obtains a `ChronoZonedDateTime` in this chronology from an `Instant`.

### Uses of ZoneId in java.time.format

Methods in java.time.format that return ZoneId
`ZoneId` DateTimeFormatter.`getZone()` Gets the overriding zone to be used during formatting.

Methods in java.time.format with parameters of type ZoneId
`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
`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
`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
`ZoneId` TimeZone.`toZoneId()` Converts this `TimeZone` object to a `ZoneId`.

Methods in java.util with parameters of type ZoneId
`static TimeZone` TimeZone.`getTimeZone(ZoneId zoneId)` Gets the `TimeZone` for the given `zoneId`.