LocalDateTime withDayOfMonth() method in Java with Examples

The withDayOfMonth() method of LocalDateTime class in Java is used to get a copy of this LocalDateTime with the dayOfMonth changed to the dayOfMonth passed as the parameter to this method. The remaining values of this LocalDateTime remains the same.

Syntax:

public LocalDateTime withDayOfMonth(int dayOfMonth)

Parameter: This method accepts a single mandatory parameter dayOfMonth which specifies the dayOfMonth to be set in the resultant LocalDateTime instance. The value of this dayOfMonth can range from 1 to 31.



Returns: The function returns a LocalDateTime instance with the dayOfMonth changed to the dayOfMonth passed as the parameter to this method. The remaining values of this LocalDateTime remains the same.

Exceptions: The function throws a DateTimeException if the dayOfMonth value is invalid.

Below programs illustrate the LocalDateTime.withDayOfMonth() method:

Program 1:

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// Program to illustrate the withDayOfMonth() method
  
import java.util.*;
import java.time.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // Get the LocalDateTime instance
        LocalDateTime dt = LocalDateTime.now();
  
        // Get the String representation of this LocalDateTime
        System.out.println("Original LocalDateTime: "
                           + dt.toString());
  
        // Get a new LocalDateTime with dayOfMonth 25
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfMonth(25));
    }
}

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Output:

Original LocalDateTime: 2018-11-30T10:38:27.429
New LocalDateTime: 2018-11-25T10:38:27.429

Program 2:

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// Program to illustrate the withDayOfMonth() method
  
import java.util.*;
import java.time.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // Get the LocalDateTime instance
        LocalDateTime dt
            = LocalDateTime
                  .parse("2015-04-06T10:15:30");
  
        // Get the String representation of this LocalDateTime
        System.out.println("Original LocalDateTime: "
                           + dt.toString());
  
        // Get a new LocalDateTime with dayOfMonth 1
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfMonth(1));
    }
}

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Output:

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-01T10:15:30

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#withDayOfMonth(int)



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