public DateTime() {
		this(TimeZone.getDefault());
	}
@Test
	public void datetimeTest() {
		DateTime dateTime = new DateTime("2017-01-05 12:34:23", DatePattern.NORM_DATETIME_FORMAT);

		// 年
		int year = dateTime.year();
		assertEquals(2017, year);

		// 季度（非季节）
		Quarter season = dateTime.quarterEnum();
		assertEquals(Quarter.Q1, season);

		// 月份
		Month month = dateTime.monthEnum();
		assertEquals(Month.JANUARY, month);

		// 日
		int day = dateTime.dayOfMonth();
		assertEquals(5, day);
	}