public static LocalDateTime of(Instant instant) {
		return of(instant, ZoneId.systemDefault());
	}
@Test
	public void ofTest() {
		final String dateStr = "2020-01-23T12:23:56";
		final DateTime dt = DateUtil.parse(dateStr);

		LocalDateTime of = LocalDateTimeUtil.of(dt);
		assertNotNull(of);
		assertEquals(dateStr, of.toString());

		// 不加Z是标准当地时间，与UTC时间不同
		of = LocalDateTimeUtil.ofUTC(dt.getTime());
		assertNotEquals(dateStr, of.toString());
	}