private static boolean isLeapYear(int s) {
    return s % 400 == 0 || (s % 4 == 0 && s % 100 != 0);
  }
Returns the value of the argument as an unsigned integer in seconds since '1970-01-01 00:00:00'
UTC.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/util/DateTimeUtils.java