LocalDateTime plusNanos() method in Java with Examples

The plusNanos() method of LocalDateTime class is used to return a copy of this date-time with the specified nanoSeconds added.

Syntax:  

public LocalDateTime plusNanos(long nanoSeconds)

Parameter: It accepts a single parameter nanoSeconds which specifies the nanoSeconds to add which may be negative.

Return Value: This method returns a LocalDateTime based on this date-time with the nanoSeconds added.

Exceptions: The program throws a DateTimeException which is thrown if the result exceeds the supported nanoSeconds range. 

Below programs illustrate the LocalDateTime.plusNanos() method in Java:

Program 1:  

Java

// Program to illustrate the plusNanos() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2018-01-11T10:15:30");

        System.out.println("LocalDateTime with 10000 nanoSeconds added: "
                           + dt1.plusNanos(10000));
    }
}

Output:
LocalDateTime with 10000 nanoSeconds added: 2018-01-11T10:15:30.000010 

Program 2: 

Java

// Program to illustrate the plusNanos() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2018-01-11T08:15:30");

        System.out.println("LocalDateTime with -1500 nanoSeconds added: "
                           + dt1.plusNanos(-1500));
    }
}

Output:
LocalDateTime with -1500 nanoSeconds added: 2018-01-11T08:15:29.999998500 

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