Packages

Definition Classes: root

Definition Classes: root

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 chrono

Support for calendar systems other than the default ISO.

The main API is based around the calendar system defined in ISO-8601. This package provides support for alternate systems.

The supported calendar systems includes:

-Hijrah calendar -Japanese calendar -Minguo calendar -Thai Buddhist calendar

It is intended that applications use the main API whenever possible, including code to read and write from a persistent data store, such as a database, and to send dates and times across a network. This package is then used at the user interface level to deal with localized input/output. See ChronoLocalDate for a full discussion of the issues.

Example

This example creates and uses a date in a non-ISO calendar system.

        // Print the Thai Buddhist date
        ChronoLocalDate now1 = ThaiBuddhistChronology.INSTANCE.now();
        int day = now1.get(ChronoField.DAY_OF_MONTH);
        int dow = now1.get(ChronoField.DAY_OF_WEEK);
        int month = now1.get(ChronoField.MONTH_OF_YEAR);
        int year = now1.get(ChronoField.YEAR);
        System.out.printf("  Today is %s %s %d-%s-%d%n", now1.getChronology().getId(),
                dow, day, month, year);

        // Enumerate the list of available calendars and print today for each
        Set<String> names = Chronology.getAvailableIds();
        for (String name : names) {
            Chronology<?> chrono = Chronology.of(name);
            ChronoLocalDate<?> date = chrono.now();
            System.out.printf("   %20s: %s%n", chrono.getId(), date.toString());
        }

        // Print today's date and the last day of the year for the Thai Buddhist Calendar.
        ChronoLocalDate first = now1
                .with(ChronoField.DAY_OF_MONTH, 1)
                .with(ChronoField.MONTH_OF_YEAR, 1);
        ChronoLocalDate last = first
                .plus(1, ChronoUnit.YEARS)
                .minus(1, ChronoUnit.DAYS);
        System.out.printf("  %s: 1st of year: %s; end of year: %s%n", last.getChronology().getId(),
                first, last);

Definition Classes: time

package format

Provides classes to print and parse dates and times.

Printing and parsing is based around the DateTimeFormatter class. That class contains common formatters and factory methods. The DateTimeFormatterBuilder class is available for advanced and complex use cases.

Localization occurs by calling withLocale(Locale) on the formatter. Further customization is possible using DecimalStyle.

Definition Classes: time

package temporal

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

package zone

Support for time-zones and their rules.

Daylight Saving Time and Time-Zones are concepts used by Governments to alter local time. This package provides support for time-zones, their rules and the resulting gaps and overlaps in the local time-line typically caused by Daylight Saving Time.

Definition Classes: time

Ser

Month

Companion class Month

object Month extends Serializable

A month-of-year, such as 'July'.

Month is an enum representing the 12 months of the year - January, February, March, April, May, June, July, August, September, October, November and December.

In addition to the textual enum name, each month-of-year has an int value. The int value follows normal usage and the ISO-8601 standard, from 1 (January) to 12 (December). It is recommended that applications use the enum rather than the int value to ensure code clarity.

Do not use ordinal() to obtain the numeric representation of Month. Use getValue() instead.

This enum represents a common concept that is found in many calendar systems. As such, this enum may be used by any calendar system that has the month-of-year concept defined exactly equivalent to the ISO-8601 calendar system.

Specification for implementors

This is an immutable and thread-safe enum.

Linear Supertypes

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val APRIL: Month
The singleton instance for the month of April with 30 days.
The singleton instance for the month of April with 30 days. This has the numeric value of 4.
val AUGUST: Month
The singleton instance for the month of August with 31 days.
The singleton instance for the month of August with 31 days. This has the numeric value of 8.
val DECEMBER: Month
The singleton instance for the month of December with 31 days.
The singleton instance for the month of December with 31 days. This has the numeric value of 12.
val FEBRUARY: Month
The singleton instance for the month of February with 28 days, or 29 in a leap year.
The singleton instance for the month of February with 28 days, or 29 in a leap year. This has the numeric value of 2.
val JANUARY: Month
The singleton instance for the month of January with 31 days.
The singleton instance for the month of January with 31 days. This has the numeric value of 1.
val JULY: Month
The singleton instance for the month of July with 31 days.
The singleton instance for the month of July with 31 days. This has the numeric value of 7.
val JUNE: Month
The singleton instance for the month of June with 30 days.
The singleton instance for the month of June with 30 days. This has the numeric value of 6.
val MARCH: Month
The singleton instance for the month of March with 31 days.
The singleton instance for the month of March with 31 days. This has the numeric value of 3.
val MAY: Month
The singleton instance for the month of May with 31 days.
The singleton instance for the month of May with 31 days. This has the numeric value of 5.
val NOVEMBER: Month
The singleton instance for the month of November with 30 days.
The singleton instance for the month of November with 30 days. This has the numeric value of 11.
val OCTOBER: Month
The singleton instance for the month of October with 31 days.
The singleton instance for the month of October with 31 days. This has the numeric value of 10.
val SEPTEMBER: Month
The singleton instance for the month of September with 30 days.
The singleton instance for the month of September with 30 days. This has the numeric value of 9.
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def from(temporal: TemporalAccessor): Month
Obtains an instance of Month from a temporal object.
Obtains an instance of Month from a temporal object.
A TemporalAccessor represents some form of date and time information. This factory converts the arbitrary temporal object to an instance of Month.
The conversion extracts the MONTH_OF_YEAR field. The extraction is only permitted if the temporal object has an ISO chronology, or can be converted to a LocalDate.
This method matches the signature of the functional interface TemporalQuery allowing it to be used in queries via method reference, Month::from.
temporal
the temporal object to convert, not null
returns
the month-of-year, not null
Exceptions thrown
DateTimeException if unable to convert to a { @code Month}
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def of(month: Int): Month
Obtains an instance of Month from an int value.
Obtains an instance of Month from an int value.
Month is an enum representing the 12 months of the year. This factory allows the enum to be obtained from the int value. The int value follows the ISO-8601 standard, from 1 (January) to 12 (December).
month
the month-of-year to represent, from 1 (January) to 12 (December)
returns
the month-of-year, not null
Exceptions thrown
DateTimeException if the month-of-year is invalid
final def synchronized[T0](arg0: => T0): T0
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def valueOf(enum: String): Month
val values: Array[Month]
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Packages

Dates and Times

Duration and Period

Additional value types

Example

Fields and Units

Adjustment

Weeks

Month

Companion class Month

object Month extends Serializable

Specification for implementors

Value Members

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

Dates and Times

Duration and Period

Additional value types

Example

Fields and Units

Adjustment

Weeks

Month

Companion class Month

object Month extends Serializable

Specification for implementors

Value Members

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped

Month