Add/subtract hrs/mins to TimeOfDay in Dart

Programming
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1

Issue

How can I add or subtract a certain amount of time from TimeOfDay _time?

Given TimeOfDay _time = TimeOfDay.now(); //12:42, how can I modify the time by adding or subtracting two hours and 10 minutes? For example, adding two hours and 10 minutes would result in 12:52 while subtracting two hours and 10 minutes would result in 10:52 and so on.

2 
// To add two hours and 10 minutes
_time = _time.AddHours(2).AddMinutes(10);

// To subtract two hours and 10 minutes
_time = _time.AddHours(-2).AddMinutes(-10);