@Test
public void testGetYearMonthDayDirectory() {

  Instant instant = Instant.ofEpochMilli(1559155036000L);
  Date date = Date.from(instant);
  ZoneId utc = ZoneId.of("UTC");
  ZoneId gmt6 = ZoneId.of("GMT+6");
  String expectedUTCDirectoryStr = "2019/05/29";
  String expectedGMT6DirectoryStr = "2019/05/30";
  String actualUTCDirectoryStr = ParserUtils.getYearMonthDayDirectory(date, utc);
  String actualGMT6DirectoryStr = ParserUtils.getYearMonthDayDirectory(date, gmt6);
  assertEquals(actualUTCDirectoryStr, expectedUTCDirectoryStr);
  assertEquals(actualGMT6DirectoryStr, expectedGMT6DirectoryStr);
}