LocalDateTime with() Method in Java with Examples

In LocalDateTime class, there are two types of with() method depending upon the parameters passed to it.

with(TemporalAdjuster adjuster)

with(TemporalAdjuster adjuster) method of the LocalDateTime class used to adjusted this date-time using TemporalAdjuster and after adjustment returns the copy of adjusted date-time.The adjustment takes place using the specified adjuster strategy object. This instance of LocalDateTime is immutable and unaffected by this method call. A simple adjuster uses to set one of the fields, such as the year field where A more complex adjuster might set the time to the last day of the year.

Syntax:



public LocalDateTime with(TemporalAdjuster adjuster)

Parameters: This method accepts adjuster as parameter which is the adjuster to use.

Return value: This method returns a LocalDateTime based on this with the adjustment made.

Exception: This method throws following Exceptions:

  • DateTimeException – if the adjustment cannot be made.
  • ArithmeticException – if numeric overflow occurs.

Below programs illustrate the with() method:
Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// LocalDateTime.with() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a LocalDateTime object
        LocalDateTime local
            = LocalDateTime.parse(
                "2020-12-31T10:15:30");
  
        // print instance
        System.out.println("LocalDateTime before"
                           + " adjustment: "
                           + local);
  
        // apply with method of LocalDateTime class
        LocalDateTime updatedlocal
            = local.with(Month.OCTOBER)
                  .with(TemporalAdjusters
                            .firstDayOfMonth());
  
        // print instance
        System.out.println("LocalDateTime after"
                           + " adjustment: "
                           + updatedlocal);
    }
}

chevron_right


Output:

LocalDateTime before adjustment: 2020-12-31T10:15:30
LocalDateTime after adjustment: 2020-10-01T10:15:30

with(TemporalField field, long newValue)

with(TemporalField field, long newValue) method of the LocalDateTime class used to set the specified field of LocalDateTime to a new value and returns the copy of new time.This method can be used to change any supported field, such as year, day, month, hour, minute or second. An exception is thrown If setting the new value is not possible due to the field is not supported or for some other reason. This instance of LocalDateTime is immutable and unaffected by this method call.

Syntax:

public LocalDateTime with(TemporalField field, long newValue)

Parameters: This method accepts field which is the field to set in the result and newValue which the new value of the field in the result as parameters.

Return value: This method returns a LocalDateTime based on this with the specified field set.

Exception: This method throws following Exceptions:

  • DateTimeException – if the adjustment cannot be made.
  • UnsupportedTemporalTypeException – if the field is not supported.
  • ArithmeticException – if numeric overflow occurs.

Below programs illustrate the with() method:
Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// LocalDateTime.with() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a LocalDateTime object
        LocalDateTime local
            = LocalDateTime.parse(
                "2021-01-01T19:55:30");
  
        // print instance
        System.out.println("LocalDateTime before"
                           + " applying method: "
                           + local);
  
        // apply with method of LocalDateTime class
        LocalDateTime updatedlocal
            = local.with(ChronoField.YEAR, 2017);
  
        // print instance
        System.out.println("LocalDateTime after"
                           + " applying method: "
                           + updatedlocal);
    }
}

chevron_right


Output:

LocalDateTime before applying method: 2021-01-01T19:55:30
LocalDateTime after applying method: 2017-01-01T19:55:30

References:
https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#with(java.time.temporal.TemporalAdjuster)
https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#with(java.time.temporal.TemporalField, long)



My Personal Notes arrow_drop_up

I am a Developer I love to code and bring my ideas alive

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.