public static DateTime parseDate(CharSequence dateString) {
		dateString = normalize(dateString);
		return parse(dateString, DatePattern.NORM_DATE_FORMAT);
	}
@Test
	public void parseDateTest() {
		final String dateStr = "2018-4-10";
		final Date date = DateUtil.parseDate(dateStr);
		final String format = DateUtil.format(date, DatePattern.NORM_DATE_PATTERN);
		assertEquals("2018-04-10", format);
	}