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LocalDateTime with() Method in Java with Examples

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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:




// 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);
    }
}


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:




// 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);
    }
}


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)



Last Updated : 15 Jan, 2019
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