public static int weekOfYear(Date date) {
		return DateTime.of(date).weekOfYear();
	}
@Test
	public void weekOfYearTest() {
		// 第一周周日
		final int weekOfYear1 = DateUtil.weekOfYear(DateUtil.parse("2016-01-03"));
		assertEquals(1, weekOfYear1);

		// 第二周周四
		final int weekOfYear2 = DateUtil.weekOfYear(DateUtil.parse("2016-01-07"));
		assertEquals(2, weekOfYear2);
	}