toRFC3339WithTimeZone method

String toRFC3339WithTimeZone()

Convert the DateTime to an RFC3339 formatted string with time zone information.

Implementation

String toRFC3339WithTimeZone() {
  String year = this.year.toString().padLeft(4, '0');
  String month = this.month.toString().padLeft(2, '0');
  String day = this.day.toString().padLeft(2, '0');
  String hour = this.hour.toString().padLeft(2, '0');
  String minute = this.minute.toString().padLeft(2, '0');
  String second = this.second.toString().padLeft(2, '0');
  String millisecond = this
      .millisecond
      .toString()
      .padLeft(3, '0')
      .replaceAll(RegExp(r'0*$'), '');

  Duration timeZoneOffset = isUtc ? Duration.zero : this.timeZoneOffset;

  String timeZoneOffsetSign = timeZoneOffset.isNegative ? '-' : '+';
  int timeZoneOffsetHours = timeZoneOffset.inHours.abs();
  int timeZoneOffsetMinutes = timeZoneOffset.inMinutes.abs() % 60;

  String timeZoneOffsetFormatted = isUtc
      ? "Z"
      : '$timeZoneOffsetSign${timeZoneOffsetHours.toString().padLeft(2, '0')}:${timeZoneOffsetMinutes.toString().padLeft(2, '0')}';

  return '$year-$month-${day}T$hour:$minute:$second.$millisecond$timeZoneOffsetFormatted';
}