Java convert nanotime to milliseconds

import java.util.concurrent.TimeUnit;

public class Lautturi {
	public static void main(String args[]) {
		long startTimer = System.nanoTime(), endTimer;

		endTimer = System.nanoTime();
		long duration = endTimer - startTimer;

		// Time in MILLISECONDS
		duration = TimeUnit.MILLISECONDS.convert(duration, TimeUnit.NANOSECONDS);

		// Time in MICROSECONDS
		duration = TimeUnit.MICROSECONDS.convert(duration, TimeUnit.NANOSECONDS);

		// Time in SECONDS
		duration = TimeUnit.SECONDS.convert(duration, TimeUnit.NANOSECONDS);

	}
}