자바 Util.currentTimeNanos()

1 개요

Java Util.currentTimeNanos()

private static class Util {
	private final static long currentTimeNanosOffset = (System.currentTimeMillis() * 1000000) - System.nanoTime();
	public static long currentTimeNanos() {
		return System.nanoTime() + currentTimeNanosOffset;
	}
}

long nano = Util.currentTimeNanos();
System.out.println(nano);
System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(nano/1000000L));
// 1491972384307016608
// 2017-04-12 13:46:24.307

2 종합 예제

public class HelloApiServerApplication {
	private static class Util {
		private final static long currentTimeNanosOffset = (System.currentTimeMillis() * 1000000) - System.nanoTime();
		public static long currentTimeNanos() {
			return System.nanoTime() + currentTimeNanosOffset;
		}
	}

	public static void main(String[] args) {
		long nano = Util.currentTimeNanos();
		System.out.println(nano);
		System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(nano/1000000L));
		// 1491972384307016608
		// 2017-04-12 13:46:24.307
	}
}

3 같이 보기

• Java System.currentTimeMillis()

4 참고 자료

• https://gist.github.com/hoffrocket/3238310