toStringWithGMT method
Returns value as time string with timezone. Ex: 13:25-03
Implementation
String toStringWithGMT() {
final timeString = toFormattedString();
final timezoneOffset = DateTime.now().timeZoneOffset;
final hourOffset =
'${timezoneOffset.isNegative ? '-' : '+'}${_addLeadingZeroIfNeeded(
timezoneOffset.inHours.abs(),
)}';
return '$timeString$hourOffset';
}