LocalTime withNano() method in Java with Examples

The withNano() method of a LocalTime class is used to get a copy of this LocalTime with the nanos changed to the nanos passed as the parameter to this method. The remaining values of this LocalTime will remain the same. This instance is immutable and unaffected by this method call.

Syntax:

public LocalTime withNano(int nano)

Parameters: This method accepts a single parameter nano which represents the nano-of-second to set in the result, from 0 to 999, 999, 999.

Return value: This method returns a LocalTime instance based on this time with the requested nano.

Exception: This method throws a exception DateTimeException if the nano value is invalid

Below programs illustrate the withNano() method:

Program 1:

// Java program to demonstrate
// LocalTime.withNano() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a LocalTime object
        LocalTime time
            = LocalTime.parse("19:34:50.63");

        // print time
        System.out.println("Old LocalTime: "
                           + time);

        // Get a new LocalDateTime with nanos 100000
        LocalTime newtime = time.withNano(100000);

        // print result
        System.out.println("New LocalDateTime: "
                           + newtime);
    }
}

Output:

Old LocalTime: 19:34:50.630
New LocalDateTime: 19:34:50.000100

Program 2:

// Java program to demonstrate
// LocalTime.withNano() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a LocalTime object
        LocalTime time
            = LocalTime.parse("01:21:30.13");

        // print time
        System.out.println("Old LocalTime: "
                           + time);

        // Get a new LocalDateTime with nanos 999999
        LocalTime newtime = time.withNano(999999);

        // print result
        System.out.println("New LocalDateTime: "
                           + newtime);
    }
}

Output:

Old LocalTime: 01:21:30.130
New LocalDateTime: 01:21:30.000999999

References: https://docs.oracle.com/javase/10/docs/api/java/time/LocalTime.html#withNano(int)