The firstDayOfMonth() method of a TemporalAdjusters class is used to return the “first day of the month” TemporalAdjuster object, which returns a new Date object set to the first day of the current month.
Syntax:
public static TemporalAdjuster firstDayOfMonth()
Parameters: This method accepts nothing.
Return value: This method returns the first day-of-month adjuster, not null.
Below programs illustrate the TemporalAdjusters.firstDayOfMonth() method:
Program 1:
// Java program to demonstrate// TemporalAdjusters.firstDayOfMonth() import java.time.LocalDate;import java.time.temporal.*; public class GFG { public static void main(String[] args) { // get TemporalAdjuster with first day // of month adjuster TemporalAdjuster temporalAdjuster = TemporalAdjusters .firstDayOfMonth(); // using adjuster for local date-time LocalDate localDate = LocalDate.of(2020, 05, 11); LocalDate firstDayOFMonth = localDate.with(temporalAdjuster); // print System.out.println("First day for " + "month for localdate " + localDate + ": " + firstDayOFMonth); }} |
Output:
First day for month for localdate 2020-05-11: 2020-05-01
Program 2:
// Java program to demonstrate// TemporalAdjusters.firstDayOfMonth() method import java.time.LocalDate;import java.time.temporal.TemporalAdjuster;import java.time.temporal.TemporalAdjusters; public class GFG { public static void main(String[] args) { // get TemporalAdjuster with first day // of month adjuster TemporalAdjuster temporalAdjuster = TemporalAdjusters .firstDayOfMonth(); // using adjuster for local date-time LocalDate localDate = LocalDate.of(2010, 12, 29); LocalDate firstDayOFMonth = localDate.with(temporalAdjuster); // print System.out.println("First day for " + "month for localdate " + localDate + ": " + firstDayOFMonth); }} |
Output:
First day for month for localdate 2010-12-29: 2010-12-01
References: https://docs.oracle.com/javase/10/docs/api/java/time/format/TemporalAdjusters.html
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