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Class TemporalAdjusters

java.lang.Object
- java.time.temporal.TemporalAdjusters

public final class TemporalAdjusters
extends Object

Common and useful TemporalAdjusters.

Adjusters are a key tool for modifying temporal objects. They exist to externalize the process of adjustment, permitting different approaches, as per the strategy design pattern. Examples might be an adjuster that sets the date avoiding weekends, or one that sets the date to the last day of the month.

There are two equivalent ways of using a TemporalAdjuster. The first is to invoke the method on the interface directly. The second is to use Temporal.with(TemporalAdjuster):

// these two lines are equivalent, but the second approach is recommended
   temporal = thisAdjuster.adjustInto(temporal);
   temporal = temporal.with(thisAdjuster);

It is recommended to use the second approach, with(TemporalAdjuster), as it is a lot clearer to read in code.

This class contains a standard set of adjusters, available as static methods. These include:

finding the first or last day of the month
finding the first day of next month
finding the first or last day of the year
finding the first day of next year
finding the first or last day-of-week within a month, such as "first Wednesday in June"
finding the next or previous day-of-week, such as "next Thursday"

Implementation Requirements:: All the implementations supplied by the static methods are immutable.
Since:: 1.8
See Also:: TemporalAdjuster

Methods

ofDateAdjuster

public static TemporalAdjuster ofDateAdjuster(UnaryOperator<LocalDate> dateBasedAdjuster)

Obtains a TemporalAdjuster that wraps a date adjuster.

The TemporalAdjuster is based on the low level Temporal interface. This method allows an adjustment from LocalDate to LocalDate to be wrapped to match the temporal-based interface. This is provided for convenience to make user-written adjusters simpler.

In general, user-written adjusters should be static constants:

static TemporalAdjuster TWO_DAYS_LATER =
       TemporalAdjusters.ofDateAdjuster(date -> date.plusDays(2));

Parameters:: dateBasedAdjuster - the date-based adjuster, not null
Returns:: the temporal adjuster wrapping on the date adjuster, not null

firstDayOfMonth

public static TemporalAdjuster firstDayOfMonth()

Returns the "first day of month" adjuster, which returns a new date set to the first day of the current month.

The ISO calendar system behaves as follows:
The input 2011-01-15 will return 2011-01-01.
The input 2011-02-15 will return 2011-02-01.

The behavior is suitable for use with most calendar systems. It is equivalent to:

temporal.with(DAY_OF_MONTH, 1);

Returns:: the first day-of-month adjuster, not null

lastDayOfMonth

public static TemporalAdjuster lastDayOfMonth()

Returns the "last day of month" adjuster, which returns a new date set to the last day of the current month.

The ISO calendar system behaves as follows:
The input 2011-01-15 will return 2011-01-31.
The input 2011-02-15 will return 2011-02-28.
The input 2012-02-15 will return 2012-02-29 (leap year).
The input 2011-04-15 will return 2011-04-30.

The behavior is suitable for use with most calendar systems. It is equivalent to:

long lastDay = temporal.range(DAY_OF_MONTH).getMaximum();
  temporal.with(DAY_OF_MONTH, lastDay);

Returns:: the last day-of-month adjuster, not null

firstDayOfNextMonth

public static TemporalAdjuster firstDayOfNextMonth()

Returns the "first day of next month" adjuster, which returns a new date set to the first day of the next month.

The ISO calendar system behaves as follows:
The input 2011-01-15 will return 2011-02-01.
The input 2011-02-15 will return 2011-03-01.

The behavior is suitable for use with most calendar systems. It is equivalent to:

temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS);

Returns:: the first day of next month adjuster, not null

firstDayOfYear

public static TemporalAdjuster firstDayOfYear()

Returns the "first day of year" adjuster, which returns a new date set to the first day of the current year.

The ISO calendar system behaves as follows:
The input 2011-01-15 will return 2011-01-01.
The input 2011-02-15 will return 2011-01-01.

The behavior is suitable for use with most calendar systems. It is equivalent to:

temporal.with(DAY_OF_YEAR, 1);

Returns:: the first day-of-year adjuster, not null

lastDayOfYear

public static TemporalAdjuster lastDayOfYear()

Returns the "last day of year" adjuster, which returns a new date set to the last day of the current year.

The ISO calendar system behaves as follows:
The input 2011-01-15 will return 2011-12-31.
The input 2011-02-15 will return 2011-12-31.

The behavior is suitable for use with most calendar systems. It is equivalent to:

long lastDay = temporal.range(DAY_OF_YEAR).getMaximum();
  temporal.with(DAY_OF_YEAR, lastDay);

Returns:: the last day-of-year adjuster, not null

firstDayOfNextYear

public static TemporalAdjuster firstDayOfNextYear()

Returns the "first day of next year" adjuster, which returns a new date set to the first day of the next year.

The ISO calendar system behaves as follows:
The input 2011-01-15 will return 2012-01-01.

The behavior is suitable for use with most calendar systems. It is equivalent to:

temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS);

Returns:: the first day of next month adjuster, not null

firstInMonth

public static TemporalAdjuster firstInMonth(DayOfWeek dayOfWeek)

Returns the first in month adjuster, which returns a new date in the same month with the first matching day-of-week. This is used for expressions like 'first Tuesday in March'.

The ISO calendar system behaves as follows:
The input 2011-12-15 for (MONDAY) will return 2011-12-05.
The input 2011-12-15 for (FRIDAY) will return 2011-12-02.

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK and DAY_OF_MONTH fields and the DAYS unit, and assumes a seven day week.

Parameters:: dayOfWeek - the day-of-week, not null
Returns:: the first in month adjuster, not null

lastInMonth

public static TemporalAdjuster lastInMonth(DayOfWeek dayOfWeek)

Returns the last in month adjuster, which returns a new date in the same month with the last matching day-of-week. This is used for expressions like 'last Tuesday in March'.

The ISO calendar system behaves as follows:
The input 2011-12-15 for (MONDAY) will return 2011-12-26.
The input 2011-12-15 for (FRIDAY) will return 2011-12-30.

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK and DAY_OF_MONTH fields and the DAYS unit, and assumes a seven day week.

Parameters:: dayOfWeek - the day-of-week, not null
Returns:: the first in month adjuster, not null

dayOfWeekInMonth

public static TemporalAdjuster dayOfWeekInMonth(int ordinal,
                                                DayOfWeek dayOfWeek)

Returns the day-of-week in month adjuster, which returns a new date in the same month with the ordinal day-of-week. This is used for expressions like the 'second Tuesday in March'.

The ISO calendar system behaves as follows:
The input 2011-12-15 for (1,TUESDAY) will return 2011-12-06.
The input 2011-12-15 for (2,TUESDAY) will return 2011-12-13.
The input 2011-12-15 for (3,TUESDAY) will return 2011-12-20.
The input 2011-12-15 for (4,TUESDAY) will return 2011-12-27.
The input 2011-12-15 for (5,TUESDAY) will return 2012-01-03.
The input 2011-12-15 for (-1,TUESDAY) will return 2011-12-27 (last in month).
The input 2011-12-15 for (-4,TUESDAY) will return 2011-12-06 (3 weeks before last in month).
The input 2011-12-15 for (-5,TUESDAY) will return 2011-11-29 (4 weeks before last in month).
The input 2011-12-15 for (0,TUESDAY) will return 2011-11-29 (last in previous month).

For a positive or zero ordinal, the algorithm is equivalent to finding the first day-of-week that matches within the month and then adding a number of weeks to it. For a negative ordinal, the algorithm is equivalent to finding the last day-of-week that matches within the month and then subtracting a number of weeks to it. The ordinal number of weeks is not validated and is interpreted leniently according to this algorithm. This definition means that an ordinal of zero finds the last matching day-of-week in the previous month.

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK and DAY_OF_MONTH fields and the DAYS unit, and assumes a seven day week.

Parameters:: ordinal - the week within the month, unbounded but typically from -5 to 5; dayOfWeek - the day-of-week, not null
Returns:: the day-of-week in month adjuster, not null

public static TemporalAdjuster next(DayOfWeek dayOfWeek)

Returns the next day-of-week adjuster, which adjusts the date to the first occurrence of the specified day-of-week after the date being adjusted.

The ISO calendar system behaves as follows:
The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).
The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).
The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-22 (seven days later).

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK field and the DAYS unit, and assumes a seven day week.

Parameters:: dayOfWeek - the day-of-week to move the date to, not null
Returns:: the next day-of-week adjuster, not null

nextOrSame

public static TemporalAdjuster nextOrSame(DayOfWeek dayOfWeek)

Returns the next-or-same day-of-week adjuster, which adjusts the date to the first occurrence of the specified day-of-week after the date being adjusted unless it is already on that day in which case the same object is returned.

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK field and the DAYS unit, and assumes a seven day week.

Parameters:: dayOfWeek - the day-of-week to check for or move the date to, not null
Returns:: the next-or-same day-of-week adjuster, not null

public static TemporalAdjuster previous(DayOfWeek dayOfWeek)

Returns the previous day-of-week adjuster, which adjusts the date to the first occurrence of the specified day-of-week before the date being adjusted.

The ISO calendar system behaves as follows:
The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).
The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).
The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-08 (seven days earlier).

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK field and the DAYS unit, and assumes a seven day week.

Parameters:: dayOfWeek - the day-of-week to move the date to, not null
Returns:: the previous day-of-week adjuster, not null

previousOrSame

public static TemporalAdjuster previousOrSame(DayOfWeek dayOfWeek)

Returns the previous-or-same day-of-week adjuster, which adjusts the date to the first occurrence of the specified day-of-week before the date being adjusted unless it is already on that day in which case the same object is returned.

The behavior is suitable for use with most calendar systems. It uses the DAY_OF_WEEK field and the DAYS unit, and assumes a seven day week.

Parameters:: dayOfWeek - the day-of-week to check for or move the date to, not null
Returns:: the previous-or-same day-of-week adjuster, not null

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