parseXsDateTime static method

int parseXsDateTime(String value)

Implementation

static int parseXsDateTime(String value) {
  const String pattern =
      r'(\d\d\d\d)\-(\d\d)\-(\d\d)[Tt](\d\d):(\d\d):(\d\d)([\.,](\d+))?([Zz]|((\+|\-)(\d?\d):?(\d\d)))?';
  final List<Match> matchList = RegExp(pattern).allMatches(value).toList();
  if (matchList.isEmpty) {
    throw ParserException('Invalid date/time format: $value');
  }
  final Match match = matchList[0];
  int timezoneShift;
  if (match.group(9) == null) {
    // No time zone specified.
    timezoneShift = 0;
  } else if (match.group(9) == 'Z' || match.group(9) == 'z') {
    timezoneShift = 0;
  } else {
    timezoneShift = int.parse(match.group(12)!) * 60 + int.parse(match.group(13)!);
    if ('-' == match.group(11)) {
      timezoneShift *= -1;
    }
  }

  final DateTime dateTime = DateTime.utc(
    int.parse(match.group(1)!),
    int.parse(match.group(2)!),
    int.parse(match.group(3)!),
    int.parse(match.group(4)!),
    int.parse(match.group(5)!),
    int.parse(match.group(6)!),
  );

  int time = dateTime.millisecondsSinceEpoch;
  if (timezoneShift != 0) {
    time -= timezoneShift * 60000;
  }

  return time;
}