@Test
@Ignore // 暂时忽略，测试不通过，add by 芋艿
public void testFormat() {

    Assert.assertEquals("", DateUtil.format(null, null));
    Assert.assertEquals("2018-01-10:12:00:00", DateUtil.format(
            new Date(1_515_585_600_000L), "yyyy-MM-dd:HH:mm:ss"));
}