Flutter date with timezone

/// converts [date] into the following format: `2020-09-16T11:55:01.802248+01:00`
static String formatISOTime(DateTime date) {
  var duration = date.timeZoneOffset;
  if (duration.isNegative)
  	return (date.toIso8601String() + "-${duration.inHours.toString().padLeft(2, '0')}:${(duration.inMinutes - (duration.inHours * 60)).toString().padLeft(2, '0')}");
  else
  	return (date.toIso8601String() + "+${duration.inHours.toString().padLeft(2, '0')}:${(duration.inMinutes - (duration.inHours * 60)).toString().padLeft(2, '0')}");
}

Source: gist.github.com

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