The withDayOfMonth() method of OffsetDateTime class in Java returns a copy of this OffsetDateTime with the day-of-month altered as specified in the parameter.
Syntax:
public OffsetDateTime withDayOfMonth(int dayOfMonth)
Parameter: This method accepts a single parameter dayOfMonth which specifies the day-of-month to be set in the result which can range from 1 to 28-31.
Return Value: It returns a OffsetDateTime based on this date with the requested day and not null.
Exceptions: The program throws a DateTimeException when the day-of-month value is invalid or if the day-of-month is invalid for the month of that particular year.
Below programs illustrate the withDayOfMonth() method:
Program 1:
// Java program to demonstrate the withDayOfMonth() method import java.time.OffsetDateTime; public class GFG { public static void main(String[] args) { // Parses the date1 OffsetDateTime date1 = OffsetDateTime .parse( "2018-12-12T13:30:30+05:00"); // Prints dates System.out.println("Date1: " + date1); // Changes the day of month System.out.println("Date1 after altering day-of-month: " + date1.withDayOfMonth(20)); }} |
Date1: 2018-12-12T13:30:30+05:00 Date1 after altering day-of-month: 2018-12-20T13:30:30+05:00
Program 2 :
// Java program to demonstrate the withDayOfMonth() method import java.time.OffsetDateTime; public class GFG { public static void main(String[] args) { try { // Parses the date1 OffsetDateTime date1 = OffsetDateTime .parse( "2018-12-12T13:30:30+05:00"); // Prints dates System.out.println("Date1: " + date1); // Changes the day of month System.out.println("Date1 after altering day-of-month: " + date1.withDayOfMonth(32)); } catch (Exception e) { System.out.println("Exception: " + e); } }} |
Date1: 2018-12-12T13:30:30+05:00
Exception: java.time.DateTimeException:
Invalid value for DayOfMonth (valid values 1 - 28/31): 32
Reference: https://docs.oracle.com/javase/10/docs/api/java/time/OffsetDateTime.html#withDayOfMonth(int)
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