java.time.temporal

Class TemporalAdjusters

java.lang.Object

java.time.temporal.TemporalAdjusters

public final class TemporalAdjusters
extends java.lang.Object

Common implementations of TemporalAdjuster.

This class provides common implementations of TemporalAdjuster. They are especially useful to document the intent of business logic and often link well to requirements. For example, these two pieces of code do the same thing, but the second one is clearer (assuming that there is a static import of this class):

  // direct manipulation
  date.withDayOfMonth(1).plusMonths(1).minusDays(1);
  // use of an adjuster from this class
  date.with(lastDayOfMonth());
 

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
   dateTime = adjuster.adjustInto(dateTime);
   dateTime = dateTime.with(adjuster);
 

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

Specification for implementors

This is a thread-safe utility class. All returned adjusters are immutable and thread-safe.

The JDK 8 ofDateAdjuster(UnaryOperator) method is not backported.

Method Summary

Methods

Modifier and Type	Method and Description
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.
static TemporalAdjuster	firstDayOfMonth() Returns the "first day of month" adjuster, which returns a new date set to the first day of the current month.
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.
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.
static TemporalAdjuster	firstDayOfYear() Returns the "first day of year" adjuster, which returns a new date set to the first day of the current year.
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.
static TemporalAdjuster	lastDayOfMonth() Returns the "last day of month" adjuster, which returns a new date set to the last day of the current month.
static TemporalAdjuster	lastDayOfYear() Returns the "last day of year" adjuster, which returns a new date set to the last day of the current year.
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.
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.
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.
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.
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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

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

next

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 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 2011-01-15 (same as input).

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

previous

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 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 2011-01-15 (same as input).

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