[Flutter] How to get difference between 2 TimeOfDay in flutter? [closed]

I want to get the duration of difference between 2 times current time and future time in 24 format and I want to store the duration in Duration class. i.e. currentTime = 13:30:20, futureTime = 16:30:10. Now I want to get its diffenrence duration = 03:00:10 and running the timer up to 16:30:10.

for more clearity ...

setDurationForTimes(DateTime time) {
String x = DateFormat('hh:mm').format(time);
TimeOfDay _startTime = TimeOfDay(
hour: int.parse(x.split(":")[0]), minute: int.parse(x.split(":")[1]));
var y = TimeOfDay(hour: _startTime.hour, minute: _startTime.minute);
prayerTimeDuration = Duration(
hours: _startTime.hour,
minutes: _startTime.minute,
);
return y;
}

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