public static int dayOfYear(Date date) {
		return DateTime.of(date).dayOfYear();
	}
@Test
	public void dayOfYearTest() {
		final int dayOfYear = DateUtil.dayOfYear(DateUtil.parse("2020-01-01"));
		assertEquals(1, dayOfYear);
		final int lengthOfYear = DateUtil.lengthOfYear(2020);
		assertEquals(366, lengthOfYear);
	}