public static long current() {
		return System.currentTimeMillis();
	}
@Test
	public void currentTest() {
		final long current = DateUtil.current();
		final String currentStr = String.valueOf(current);
		assertEquals(13, currentStr.length());

		final long currentNano = DateUtil.current();
		final String currentNanoStr = String.valueOf(currentNano);
		assertNotNull(currentNanoStr);
	}