The firstInMonth(DayOfWeek) method of a TemporalAdjusters class is used to return a TemporalAdjuster object which can be used to get a new Date object which is the first date of the same month with the same matching DayOfWeek as passed as a parameter from any Date object on which this TemporalAdjuster is applied. Syntax:
public static TemporalAdjuster
firstInMonth(DayOfWeek dayOfWeek)
Parameters: This method accepts dayOfWeek which can be used to get a new Date object which is the first date of the same month with the same matching DayOfWeek. Return value: This method returns the first in month adjuster, not null. Below programs illustrate the TemporalAdjusters.firstInMonth() method: Program 1:
Java
// Java program to demonstrate// TemporalAdjusters.firstInMonth()import java.time.*;import java.time.temporal.*;public class GFG { public static void main(String[] args) { // get TemporalAdjuster with // the first in month adjuster TemporalAdjuster temporalAdjuster = TemporalAdjusters.firstInMonth( DayOfWeek.SUNDAY); // using adjuster for local date time LocalDate localDate = LocalDate.of(2023, 10, 11); LocalDate firstInMonth = localDate.with(temporalAdjuster); // print System.out.println( "First date in month having" + " sunday for localdate " + localDate + " is: " + firstInMonth); }} |
Output:
First date in month having sunday for localdate 2023-10-11 is: 2023-10-01
Program 2:
Java
// Java program to demonstrate// TemporalAdjusters.firstInMonth() methodimport java.time.*;import java.time.temporal.*;public class GFG { public static void main(String[] args) { // get TemporalAdjuster with // the first in month adjuster TemporalAdjuster temporalAdjuster = TemporalAdjusters.firstInMonth( DayOfWeek.TUESDAY); // using adjuster for local date-time LocalDate localDate = LocalDate.of(2023, 10, 11); LocalDate firstInMonth = localDate.with(temporalAdjuster); // print System.out.println( "First date in a month having" + " TUESDAY for localdate " + localDate + " is: " + firstInMonth); }} |
Output:
First date in a month having TUESDAY for localdate 2023-10-11 is: 2023-10-03
