import java.time.Instant;

public class Epoch {
    public static void main(String[] args) {
        // Use Instant.now() to get the current time
        Instant now = Instant.now();
        System.out.println(now);

        // Get elapsed time since the Unix epoch in seconds,
        // milliseconds or nanoseconds
        System.out.println(now.getEpochSecond());
        System.out.println(now.toEpochMilli());
        System.out.println(now.getNano());

        // You can also convert integer seconds or nanoseconds
        // since the epoch into the corresponding Instant
        System.out.println(Instant.ofEpochSecond(now.getEpochSecond()));
        System.out.println(Instant.ofEpochSecond(0, now.getNano()));
    }
}