code: public static long parseTimestampWithoutTimeZone(String value)
      {
          LocalDateTime localDateTime = TIMESTAMP_WITH_OR_WITHOUT_TIME_ZONE_FORMATTER.parseLocalDateTime(value);
          try {
              return (long) getLocalMillis.invokeExact(localDateTime);
          }
          catch (Throwable e) {
              throw new RuntimeException(e);
          }
      }
docs: Parse a string (optionally containing a zone) as a value of TIMESTAMP type.
  If the string specifies a zone, the zone is discarded.
  <p>
  For example: {@code "2000-01-01 01:23:00"} is parsed to TIMESTAMP {@code 2000-01-01T01:23:00}
  and {@code "2000-01-01 01:23:00 +01:23"} is also parsed to TIMESTAMP {@code 2000-01-01T01:23:00.000}.
  
  @return stack representation of TIMESTAMP type