Display seconds since the epoch with Java Date and Time Conversion Character

To display seconds since the epoch, use the ‘s’ Date and Time conversion specifier.

System.out.printf("Seconds since epoch = %ts", d);

The above would display seconds since.

1970-01-01 00:00:00 GMT

Example

 Live Demo

import java.util.Date;
public class Demo {
   public static void main(String[] args) {
      Date d = new Date();
      System.out.printf("Nanoseconds = %tN
", d);
      System.out.printf("Seconds since epoch = %ts", d);
   }
}

Output

Nanoseconds = 364000000
Seconds since epoch = 1543241402