LocalDateTime plusNanos() method in Java

An immutable copy of a LocalDateTime object where some nanoseconds are added to it can be obtained using the plusNanos() method in the LocalDateTime class in Java. This method requires a single parameter i.e. the number of nanoseconds to be added and it returns the LocalDateTime object with the added nanoseconds.

A program that demonstrates this is given as follows −

Example

 Live Demo

import java.time.*;
public class Demo {
   public static void main(String[] args) {
      LocalDateTime ldt = LocalDateTime.now();
      System.out.println("The current LocalDateTime is: " + ldt);
      System.out.println("The LocalDateTime with 1000 nanoseconds added is: " + ldt.plusNanos(1000));
   }
}

Output

The current LocalDateTime is: 2019-02-16T11:26:59.709
The LocalDateTime with 1000 nanoseconds added is: 2019-02-16T11:26:59.709001

Now let us understand the above program.

First the current LocalDateTime is displayed. Then an immutable copy of the LocalDateTime where 1000 nanoseconds are added is obtained using the plusNanos() method and this is displayed. A code snippet that demonstrates this is as follows −

LocalDateTime ldt = LocalDateTime.now();
System.out.println("The current LocalDateTime is: " + ldt);
System.out.println("The LocalDateTime with 1000 nanoseconds added is: " + ldt.plusNanos(1000));