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  • package java
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    root
  • package time

    The main API for dates, times, instants, and durations.

    The main API for dates, times, instants, and durations.

    The classes defined here represent the principal date-time concepts, including instants, durations, dates, times, time-zones and periods. They are based on the ISO calendar system, which is the de facto world calendar following the proleptic Gregorian rules. All the classes are immutable and thread-safe.

    Each date time instance is composed of fields that are conveniently made available by the APIs. For lower level access to the fields refer to the org.threeten.bp.temporal package. Each class includes support for printing and parsing all manner of dates and times. Refer to the org.threeten.bp.format package for customization options.

    The org.threeten.bp.chrono package contains the calendar neutral API. This is intended for use by applications that need to use localized calendars. It is recommended that applications use the ISO-8601 dates and time classes from this package across system boundaries, such as to the database or across the network. The calendar neutral API should be reserved for interactions with users.

    Dates and Times

    org.threeten.bp.Instant is essentially a numeric timestamp. The current Instant can be retrieved from a org.threeten.bp.Clock. This is useful for logging and persistence of a point in time and has in the past been associated with storing the result from java.lang.System#currentTimeMillis().

    org.threeten.bp.LocalDate stores a date without a time. This stores a date like '2010-12-03' and could be used to store a birthday.

    org.threeten.bp.LocalTime stores a time without a date. This stores a time like '11:30' and could be used to store an opening or closing time.

    org.threeten.bp.LocalDateTime stores a date and time. This stores a date-time like '2010-12-03T11:30'.

    org.threeten.bp.OffsetTime stores a time and offset from UTC without a date. This stores a date like '11:30+01:00'. The ZoneOffset is of the form '+01:00'.

    org.threeten.bp.OffsetDateTime stores a date and time and offset from UTC. This stores a date-time like '2010-12-03T11:30+01:00'. This is sometimes found in XML messages and other forms of persistence, but contains less information than a full time-zone.

    org.threeten.bp.ZonedDateTime stores a date and time with a time-zone. This is useful if you want to perform accurate calculations of dates and times taking into account the org.threeten.bp.ZoneId, such as 'Europe/Paris'. Where possible, it is recommended to use a simpler class. The widespread use of time-zones tends to add considerable complexity to an application.

    Duration and Period

    Beyond dates and times, the API also allows the storage of period and durations of time. A org.threeten.bp.Duration is a simple measure of time along the time-line in nanoseconds. A org.threeten.bp.Period expresses an amount of time in units meaningful to humans, such as years or hours.

    Additional value types

    org.threeten.bp.Year stores a year on its own. This stores a single year in isolation, such as '2010'.

    org.threeten.bp.YearMonth stores a year and month without a day or time. This stores a year and month, such as '2010-12' and could be used for a credit card expiry.

    org.threeten.bp.MonthDay stores a month and day without a year or time. This stores a month and day-of-month, such as '--12-03' and could be used to store an annual event like a birthday without storing the year.

    org.threeten.bp.Month stores a month on its own. This stores a single month-of-year in isolation, such as 'DECEMBER'.

    org.threeten.bp.DayOfWeek stores a day-of-week on its own. This stores a single day-of-week in isolation, such as 'TUESDAY'.

    Definition Classes
    java
  • package temporal

    Access to date and time using fields and units.

    Access to date and time using fields and units.

    This package expands on the base package to provide additional functionality for more powerful use cases. Support is included for:

    • Units of date-time, such as years, months, days and hours
    • Fields of date-time, such as month-of-year, day-of-week or hour-of-day
    • Date-time adjustment functions
    • Different definitions of weeks

    Fields and Units

    Dates and times are expressed in terms of fields and units. A unit is used to measure an amount of time, such as years, days or minutes. All units implement org.threeten.bp.temporal.TemporalUnit. The set of well known units is defined in org.threeten.bp.temporal.ChronoUnit, for example, org.threeten.bp.temporal.ChronoUnit#DAYS. The unit interface is designed to allow applications to add their own units.

    A field is used to express part of a larger date-time, such as year, month-of-year or second-of-minute. All fields implement org.threeten.bp.temporal.TemporalField. The set of well known fields are defined in org.threeten.bp.temporal.ChronoField, for example, org.threeten.bp.temporal.ChronoField#HOUR_OF_DAY. An additional fields are defined by org.threeten.bp.temporal.JulianFields. The field interface is designed to allow applications to add their own fields.

    This package provides tools that allow the units and fields of date and time to be accessed in a general way most suited for frameworks. org.threeten.bp.temporal.Temporal provides the abstraction for date time types that support fields. Its methods support getting the value of a field, creating a new date time with the value of a field modified, and extracting another date time type, typically used to extract the offset or time-zone.

    One use of fields in application code is to retrieve fields for which there is no convenience method. For example, getting the day-of-month is common enough that there is a method on LocalDate called getDayOfMonth(). However for more unusual fields it is necessary to use the field. For example, date.get(ChronoField.ALIGNED_WEEK_OF_MONTH). The fields also provide access to the range of valid values.

    Adjustment

    A key part of the date-time problem space is adjusting a date to a new, related value, such as the "last day of the month", or "next Wednesday". These are modeled as functions that adjust a base date-time. The functions implement org.threeten.bp.temporal.TemporalAdjuster and operate on org.threeten.bp.temporal.Temporal. A set of common functions are provided in org.threeten.bp.temporal.TemporalAdjusters. For example, to find the first occurrence of a day-of-week after a given date, use org.threeten.bp.temporal.TemporalAdjusters#next(DayOfWeek), such as date.with(next(MONDAY)).

    Weeks

    Different locales have different definitions of the week. For example, in Europe the week typically starts on a Monday, while in the US it starts on a Sunday. The org.threeten.bp.temporal.WeekFields class models this distinction.

    The ISO calendar system defines an additional week-based division of years. This defines a year based on whole Monday to Monday weeks. This is modeled in org.threeten.bp.temporal.IsoFields.

    Definition Classes
    time
  • ChronoField
  • ChronoUnit
  • IsoFields
  • JulianFields
  • Temporal
  • TemporalAccessor
  • TemporalAdjuster
  • TemporalAdjusters
  • TemporalAmount
  • TemporalField
  • TemporalQueries
  • TemporalQuery
  • TemporalUnit
  • UnsupportedTemporalTypeException
  • ValueRange
  • WeekFields

object ChronoUnit extends Serializable

A standard set of date periods units.

This set of units provide unit-based access to manipulate a date, time or date-time. The standard set of units can be extended by implementing TemporalUnit.

These units are intended to be applicable in multiple calendar systems. For example, most non-ISO calendar systems define units of years, months and days, just with slightly different rules. The documentation of each unit explains how it operates.

Specification for implementors

This is a final, immutable and thread-safe enum.

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  4. val CENTURIES: ChronoUnit

    Unit that represents the concept of a century.

    Unit that represents the concept of a century. For the ISO calendar system, it is equal to 100 years.

    When used with other calendar systems it must correspond to an integral number of days and is normally an integral number of years.

  5. val DAYS: ChronoUnit

    Unit that represents the concept of a day.

    Unit that represents the concept of a day. For the ISO calendar system, it is the standard day from midnight to midnight. The estimated duration of a day is 24 Hours.

    When used with other calendar systems it must correspond to the day defined by the rising and setting of the Sun on Earth. It is not required that days begin at midnight - when converting between calendar systems, the date should be equivalent at midday.

  6. val DECADES: ChronoUnit

    Unit that represents the concept of a decade.

    Unit that represents the concept of a decade. For the ISO calendar system, it is equal to 10 years.

    When used with other calendar systems it must correspond to an integral number of days and is normally an integral number of years.

  7. val ERAS: ChronoUnit

    Unit that represents the concept of an era.

    Unit that represents the concept of an era. The ISO calendar system doesn't have eras thus it is impossible to add an era to a date or date-time. The estimated duration of the era is artificially defined as 1,000,000,000 Years.

    When used with other calendar systems there are no restrictions on the unit.

  8. val FOREVER: ChronoUnit

    Artificial unit that represents the concept of forever.

    Artificial unit that represents the concept of forever. This is primarily used with TemporalField to represent unbounded fields such as the year or era. The estimated duration of the era is artificially defined as the largest duration supported by Duration.

  9. val HALF_DAYS: ChronoUnit

    Unit that represents the concept of half a day, as used in AM/PM.

    Unit that represents the concept of half a day, as used in AM/PM. For the ISO calendar system, it is equal to 12 hours.

  10. val HOURS: ChronoUnit

    Unit that represents the concept of an hour.

    Unit that represents the concept of an hour. For the ISO calendar system, it is equal to 60 minutes.

  11. val MICROS: ChronoUnit

    Unit that represents the concept of a microsecond.

    Unit that represents the concept of a microsecond. For the ISO calendar system, it is equal to the 1,000,000th part of the second unit.

  12. val MILLENNIA: ChronoUnit

    Unit that represents the concept of a millennium.

    Unit that represents the concept of a millennium. For the ISO calendar system, it is equal to 1000 years.

    When used with other calendar systems it must correspond to an integral number of days and is normally an integral number of years.

  13. val MILLIS: ChronoUnit

    Unit that represents the concept of a millisecond.

    Unit that represents the concept of a millisecond. For the ISO calendar system, it is equal to the 1000th part of the second unit.

  14. val MINUTES: ChronoUnit

    Unit that represents the concept of a minute.

    Unit that represents the concept of a minute. For the ISO calendar system, it is equal to 60 seconds.

  15. val MONTHS: ChronoUnit

    Unit that represents the concept of a month.

    Unit that represents the concept of a month. For the ISO calendar system, the length of the month varies by month-of-year. The estimated duration of a month is one twelfth of 365.2425 Days.

    When used with other calendar systems it must correspond to an integral number of days.

  16. val NANOS: ChronoUnit

    Unit that represents the concept of a nanosecond, the smallest supported unit of time.

    Unit that represents the concept of a nanosecond, the smallest supported unit of time. For the ISO calendar system, it is equal to the 1,000,000,000th part of the second unit.

  17. val SECONDS: ChronoUnit

    Unit that represents the concept of a second.

    Unit that represents the concept of a second. For the ISO calendar system, it is equal to the second in the SI system of units, except around a leap-second.

  18. val WEEKS: ChronoUnit

    Unit that represents the concept of a week.

    Unit that represents the concept of a week. For the ISO calendar system, it is equal to 7 days.

    When used with other calendar systems it must correspond to an integral number of days.

  19. val YEARS: ChronoUnit

    Unit that represents the concept of a year.

    Unit that represents the concept of a year. For the ISO calendar system, it is equal to 12 months. The estimated duration of a year is 365.2425 Days.

    When used with other calendar systems it must correspond to an integral number of days or months roughly equal to a year defined by the passage of the Earth around the Sun.

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