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  • package root
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  • package org
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  • package threeten
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  • package bp

    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
    threeten
  • 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
    bp
  • ChronoField
  • ChronoUnit
  • IsoFields
  • JulianFields
  • Temporal
  • TemporalAccessor
  • TemporalAdjuster
  • TemporalAdjusters
  • TemporalAmount
  • TemporalField
  • TemporalQueries
  • TemporalQuery
  • TemporalUnit
  • UnsupportedTemporalTypeException
  • ValueRange
  • WeekFields
o

org.threeten.bp.temporal

JulianFields

object JulianFields

A set of date fields that provide access to Julian Days.

The Julian Day is a standard way of expressing date and time commonly used in the scientific community. It is expressed as a decimal number of whole days where days start at midday. This class represents variations on Julian Days that count whole days from midnight.

Specification for implementors

This is an immutable and thread-safe class.

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  4. val JULIAN_DAY: TemporalField

    Julian Day field.

    Julian Day field.

    This is an integer-based version of the Julian Day Number. Julian Day is a well-known system that represents the count of whole days since day 0, which is defined to be January 1, 4713 BCE in the Julian calendar, and -4713-11-24 Gregorian. The field has "JulianDay" as 'name', and 'DAYS' as 'baseUnit'. The field always refers to the local date-time, ignoring the offset or zone.

    For date-times, 'JULIAN_DAY.getFrom()' assumes the same value from midnight until just before the next midnight. When 'JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. 'JULIAN_DAY.adjustInto()' and 'JULIAN_DAY.getFrom()' only apply to Temporal objects that can be converted into ChronoField#EPOCH_DAY. A DateTimeException is thrown for any other type of object.

    Astronomical and Scientific Notes

    The standard astronomical definition uses a fraction to indicate the time-of-day, thus 3.25 would represent the time 18:00, since days start at midday. This implementation uses an integer and days starting at midnight. The integer value for the Julian Day Number is the astronomical Julian Day value at midday of the date in question. This amounts to the astronomical Julian Day, rounded to an integer JDN = floor(JD + 0.5).

    | ISO date          |  Julian Day Number | Astronomical Julian Day |
| 1970-01-01T00:00  |         2,440,588  |         2,440,587.5     |
| 1970-01-01T06:00  |         2,440,588  |         2,440,587.75    |
| 1970-01-01T12:00  |         2,440,588  |         2,440,588.0     |
| 1970-01-01T18:00  |         2,440,588  |         2,440,588.25    |
| 1970-01-02T00:00  |         2,440,589  |         2,440,588.5     |
| 1970-01-02T06:00  |         2,440,589  |         2,440,588.75    |
| 1970-01-02T12:00  |         2,440,589  |         2,440,589.0     |

    Julian Days are sometimes taken to imply Universal Time or UTC, but this implementation always uses the Julian Day number for the local date, regardless of the offset or time-zone.

  5. val MODIFIED_JULIAN_DAY: TemporalField

    Modified Julian Day field.

    Modified Julian Day field.

    This is an integer-based version of the Modified Julian Day Number. Modified Julian Day (MJD) is a well-known system that counts days continuously. It is defined relative to astronomical Julian Day as MJD = JD - 2400000.5. Each Modified Julian Day runs from midnight to midnight. The field always refers to the local date-time, ignoring the offset or zone.

    For date-times, 'MODIFIED_JULIAN_DAY.getFrom()' assumes the same value from midnight until just before the next midnight. When 'MODIFIED_JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. 'MODIFIED_JULIAN_DAY.adjustInto()' and 'MODIFIED_JULIAN_DAY.getFrom()' only apply to Temporal objects that can be converted into ChronoField#EPOCH_DAY. A DateTimeException is thrown for any other type of object.

    This implementation is an integer version of MJD with the decimal part rounded to floor.

    Astronomical and Scientific Notes 

    | ISO date          | Modified Julian Day |      Decimal MJD |
| 1970-01-01T00:00  |             40,587  |       40,587.0   |
| 1970-01-01T06:00  |             40,587  |       40,587.25  |
| 1970-01-01T12:00  |             40,587  |       40,587.5   |
| 1970-01-01T18:00  |             40,587  |       40,587.75  |
| 1970-01-02T00:00  |             40,588  |       40,588.0   |
| 1970-01-02T06:00  |             40,588  |       40,588.25  |
| 1970-01-02T12:00  |             40,588  |       40,588.5   |

    Modified Julian Days are sometimes taken to imply Universal Time or UTC, but this implementation always uses the Modified Julian Day for the local date, regardless of the offset or time-zone.

  6. val RATA_DIE: TemporalField

    Rata Die field.

    Rata Die field.

    Rata Die counts whole days continuously starting day 1 at midnight at the beginning of 0001-01-01 (ISO). The field always refers to the local date-time, ignoring the offset or zone.

    For date-times, 'RATA_DIE.getFrom()' assumes the same value from midnight until just before the next midnight. When 'RATA_DIE.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. 'MODIFIED_JULIAN_DAY.adjustInto()' and 'RATA_DIE.getFrom()' only apply to Temporal objects that can be converted into ChronoField#EPOCH_DAY. A DateTimeException is thrown for any other type of object.

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