addHours method
Adds a specified number of hours to the current DateTime instance.
Example usage:
final date = DateTime(2020, 1, 1, 10, 0, 0);
final newDate = date.addHours(5);
print(newDate); // 2020-01-01 15:00:00.000
Implementation
DateTime addHours(int amount) => add(Duration(hours: amount));