Dart/Flutter How to compare two TimeOfDay times?

Thanks from @Lucas idea, you can calculate hour and minute by

TimeOfDay yourTime ; 
TimOfDay nowTime = TimeOfDay.now()

double _doubleYourTime = yourTime.hour.toDouble() +
            (yourTime.minute.toDouble() / 60);
double _doubleNowTime = nowTime.hour.toDouble() +
            (nowTime.minute.toDouble() / 60);

double _timeDiff = _doubleYourTime - _doubleNowTime;

double _hr = _timeDiff.truncate();
double _minute = (_timeDiff - _timeDiff.truncate()) * 60;

print('Here your Happy $_hr Hour and also $_minute min');

Convert it to a double then compare.

double toDouble(TimeOfDay myTime) => myTime.hour + myTime.minute/60.0

extension TimeOfDayExtension on TimeOfDay {
  int compareTo(TimeOfDay other) {
    if (hour < other.hour) return -1;
    if (hour > other.hour) return 1;
    if (minute < other.minute) return -1;
    if (minute > other.minute) return 1;
    return 0;
  }
}