Java Date Time Java Java API
java.time.Duration
public long toNanos()
package com.logicbig.example.duration;import java.time.Duration;public class ToNanosExample { public static void main(String... args) { Duration d = Duration.ofMinutes(34); System.out.println(d); long n = d.toNanos(); System.out.println(n); }}
PT34M2040000000000