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  • package java
    Definition Classes
    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

final class WeekFields extends Serializable

Localized definitions of the day-of-week, week-of-month and week-of-year fields.

A standard week is seven days long, but cultures have different definitions for some other aspects of a week. This class represents the definition of the week, for the purpose of providing TemporalField instances.

WeekFields provides three fields, #dayOfWeek(), #weekOfMonth(), and #weekOfYear() that provide access to the values from any temporal object.

The computations for day-of-week, week-of-month, and week-of-year are based on the proleptic-year, month-of-year, day-of-month, and ISO day-of-week which are based on the epoch-day and the chronology. The values may not be aligned with the year-of-Era depending on the Chronology. A week is defined by:

  • The first day-of-week. For example, the ISO-8601 standard considers Monday to be the first day-of-week.
  • The minimal number of days in the first week. For example, the ISO-8601 standard counts the first week as needing at least 4 days.

Together these two values allow a year or month to be divided into weeks.

Week of Month

One field is used: week-of-month. The calculation ensures that weeks never overlap a month boundary. The month is divided into periods where each period starts on the defined first day-of-week. The earliest period is referred to as week 0 if it has less than the minimal number of days and week 1 if it has at least the minimal number of days.

Examples of WeekFields
DateDay-of-week First day: Monday
Minimal days: 4		First day: Monday
Minimal days: 5
2008-12-31Wednesday Week 5 of December 2008Week 5 of December 2008
2009-01-01Thursday Week 1 of January 2009Week 0 of January 2009
2009-01-04Sunday Week 1 of January 2009Week 0 of January 2009
2009-01-05Monday Week 2 of January 2009Week 1 of January 2009
=== Week of Year === One field is used: week-of-year. The calculation ensures that weeks never overlap a year boundary. The year is divided into periods where each period starts on the defined first day-of-week. The earliest period is referred to as week 0 if it has less than the minimal number of days and week 1 if it has at least the minimal number of days. This class is immutable and thread-safe.

Annotations
@SerialVersionUID()
Exceptions thrown

IllegalArgumentException if the minimal days value is invalid

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  1. final def !=(arg0: Any): Boolean
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    protected[java.lang]
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  6. val dayOfWeek: TemporalField

    Returns a field to access the day of week based on this WeekFields.

    Returns a field to access the day of week based on this WeekFields.

    This is similar to ChronoField#DAY_OF_WEEK but uses values for the day-of-week based on this WeekFields. The days are numbered from 1 to 7 where the first day-of-week is assigned the value 1.

    For example, if the first day-of-week is Sunday, then that will have the value 1, with other days ranging from Monday as 2 to Saturday as 7.

    In the resolving phase of parsing, a localized day-of-week will be converted to a standardized ChronoField day-of-week. The day-of-week must be in the valid range 1 to 7. Other fields in this class build dates using the standardized day-of-week.

    returns

    a field providing access to the day-of-week with localized numbering, not null

  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def equals(that: Any): Boolean

    Checks if this WeekFields is equal to the specified object.

    Checks if this WeekFields is equal to the specified object.

    The comparison is based on the entire state of the rules, which is the first day-of-week and minimal days.

    that

    the other rules to compare to, null returns false

    returns

    true if this is equal to the specified rules

    Definition Classes
    WeekFields → AnyRef → Any
  9. def finalize(): Unit
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    protected[java.lang]
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    @throws(classOf[java.lang.Throwable])
  10. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
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    Annotations
    @native()
  11. def getFirstDayOfWeek: DayOfWeek

    Gets the first day-of-week.

    Gets the first day-of-week.

    The first day-of-week varies by culture. For example, the US uses Sunday, while France and the ISO-8601 standard use Monday. This method returns the first day using the standard DayOfWeek enum.

    returns

    the first day-of-week, not null

  12. def getMinimalDaysInFirstWeek: Int

    Gets the minimal number of days in the first week.

    Gets the minimal number of days in the first week.

    The number of days considered to define the first week of a month or year varies by culture. For example, the ISO-8601 requires 4 days (more than half a week) to be present before counting the first week.

    returns

    the minimal number of days in the first week of a month or year, from 1 to 7

  13. def hashCode(): Int

    A hash code for this WeekFields.

    A hash code for this WeekFields.

    returns

    a suitable hash code

    Definition Classes
    WeekFields → AnyRef → Any
  14. final def isInstanceOf[T0]: Boolean
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  15. final def ne(arg0: AnyRef): Boolean
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  16. final def notify(): Unit
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  17. final def notifyAll(): Unit
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  18. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
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  19. def toString(): String

    A string representation of this WeekFields instance.

    A string representation of this WeekFields instance.

    returns

    the string representation, not null

    Definition Classes
    WeekFields → AnyRef → Any
  20. final def wait(): Unit
    Definition Classes
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    Annotations
    @throws(classOf[java.lang.InterruptedException])
  21. final def wait(arg0: Long, arg1: Int): Unit
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    @throws(classOf[java.lang.InterruptedException])
  22. final def wait(arg0: Long): Unit
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  23. val weekBasedYear: TemporalField

    Returns a field to access the year of a week-based-year based on this WeekFields.

    Returns a field to access the year of a week-based-year based on this WeekFields.

    This represents the concept of the year where weeks start on a fixed day-of-week, such as Monday and each week belongs to exactly one year. This field is typically used with WeekFields#dayOfWeek() and WeekFields#weekOfWeekBasedYear().

    Week one(1) is the week starting on the WeekFields#getFirstDayOfWeek where there are at least WeekFields#getMinimalDaysInFirstWeek() days in the year. Thus, week one may start before the start of the year. If the first week starts after the start of the year then the period before is in the last week of the previous year.

    This field can be used with any calendar system.

    In the resolving phase of parsing, a date can be created from a week-based-year, week-of-year and day-of-week.

    In strict mode, all three fields are validated against their range of valid values. The week-of-year field is validated to ensure that the resulting week-based-year is the week-based-year requested.

    In smart mode, all three fields are validated against their range of valid values. The week-of-week-based-year field is validated from 1 to 53, meaning that the resulting date can be in the following week-based-year to that specified.

    In lenient mode, the year and day-of-week are validated against the range of valid values. The resulting date is calculated equivalent to the following three stage approach. First, create a date on the first day of the first week in the requested week-based-year. Then take the week-of-week-based-year, subtract one, and add the amount in weeks to the date. Finally, adjust to the correct day-of-week within the localized week.

    returns

    a field providing access to the week-based-year, not null

  24. val weekOfMonth: TemporalField

    Returns a field to access the week of month based on this WeekFields.

    Returns a field to access the week of month based on this WeekFields.

    This represents the concept of the count of weeks within the month where weeks start on a fixed day-of-week, such as Monday. This field is typically used with WeekFields#dayOfWeek().

    Week one (1) is the week starting on the WeekFields#getFirstDayOfWeek where there are at least WeekFields#getMinimalDaysInFirstWeek() days in the month. Thus, week one may start up to minDays days before the start of the month. If the first week starts after the start of the month then the period before is week zero (0).

    For example:
    - if the 1st day of the month is a Monday, week one starts on the 1st and there is no week zero
    - if the 2nd day of the month is a Monday, week one starts on the 2nd and the 1st is in week zero
    - if the 4th day of the month is a Monday, week one starts on the 4th and the 1st to 3rd is in week zero
    - if the 5th day of the month is a Monday, week two starts on the 5th and the 1st to 4th is in week one

    This field can be used with any calendar system.

    In the resolving phase of parsing, a date can be created from a year, week-of-month, month-of-year and day-of-week.

    In strict mode, all four fields are validated against their range of valid values. The week-of-month field is validated to ensure that the resulting month is the month requested.

    In smart mode, all four fields are validated against their range of valid values. The week-of-month field is validated from 0 to 6, meaning that the resulting date can be in a different month to that specified.

    In lenient mode, the year and day-of-week are validated against the range of valid values. The resulting date is calculated equivalent to the following four stage approach. First, create a date on the first day of the first week of January in the requested year. Then take the month-of-year, subtract one, and add the amount in months to the date. Then take the week-of-month, subtract one, and add the amount in weeks to the date. Finally, adjust to the correct day-of-week within the localized week.

    returns

    a field providing access to the week-of-month, not null

  25. val weekOfWeekBasedYear: TemporalField

    Returns a field to access the week of a week-based-year based on this WeekFields.

    Returns a field to access the week of a week-based-year based on this WeekFields.

    This represents the concept of the count of weeks within the year where weeks start on a fixed day-of-week, such as Monday and each week belongs to exactly one year. This field is typically used with WeekFields#dayOfWeek() and WeekFields#weekBasedYear().

    Week one(1) is the week starting on the WeekFields#getFirstDayOfWeek where there are at least WeekFields#getMinimalDaysInFirstWeek() days in the year. If the first week starts after the start of the year then the period before is in the last week of the previous year.

    For example:
    - if the 1st day of the year is a Monday, week one starts on the 1st
    - if the 2nd day of the year is a Monday, week one starts on the 2nd and the 1st is in the last week of the previous year
    - if the 4th day of the year is a Monday, week one starts on the 4th and the 1st to 3rd is in the last week of the previous year
    - if the 5th day of the year is a Monday, week two starts on the 5th and the 1st to 4th is in week one

    This field can be used with any calendar system.

    In the resolving phase of parsing, a date can be created from a week-based-year, week-of-year and day-of-week.

    In strict mode, all three fields are validated against their range of valid values. The week-of-year field is validated to ensure that the resulting week-based-year is the week-based-year requested.

    In smart mode, all three fields are validated against their range of valid values. The week-of-week-based-year field is validated from 1 to 53, meaning that the resulting date can be in the following week-based-year to that specified.

    In lenient mode, the year and day-of-week are validated against the range of valid values. The resulting date is calculated equivalent to the following three stage approach. First, create a date on the first day of the first week in the requested week-based-year. Then take the week-of-week-based-year, subtract one, and add the amount in weeks to the date. Finally, adjust to the correct day-of-week within the localized week.

    returns

    a field providing access to the week-of-week-based-year, not null

  26. val weekOfYear: TemporalField

    Returns a field to access the week of year based on this WeekFields.

    Returns a field to access the week of year based on this WeekFields.

    This represents the concept of the count of weeks within the year where weeks start on a fixed day-of-week, such as Monday. This field is typically used with WeekFields#dayOfWeek().

    Week one(1) is the week starting on the WeekFields#getFirstDayOfWeek where there are at least WeekFields#getMinimalDaysInFirstWeek() days in the year. Thus, week one may start up to minDays days before the start of the year. If the first week starts after the start of the year then the period before is week zero (0).

    For example:
    - if the 1st day of the year is a Monday, week one starts on the 1st and there is no week zero
    - if the 2nd day of the year is a Monday, week one starts on the 2nd and the 1st is in week zero
    - if the 4th day of the year is a Monday, week one starts on the 4th and the 1st to 3rd is in week zero
    - if the 5th day of the year is a Monday, week two starts on the 5th and the 1st to 4th is in week one

    This field can be used with any calendar system.

    In the resolving phase of parsing, a date can be created from a year, week-of-year and day-of-week.

    In strict mode, all three fields are validated against their range of valid values. The week-of-year field is validated to ensure that the resulting year is the year requested.

    In smart mode, all three fields are validated against their range of valid values. The week-of-year field is validated from 0 to 54, meaning that the resulting date can be in a different year to that specified.

    In lenient mode, the year and day-of-week are validated against the range of valid values. The resulting date is calculated equivalent to the following three stage approach. First, create a date on the first day of the first week in the requested year. Then take the week-of-year, subtract one, and add the amount in weeks to the date. Finally, adjust to the correct day-of-week within the localized week.

    returns

    a field providing access to the week-of-year, not null

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