import 'package:flutter/material.dart'; extension TimeOfDayExt on TimeOfDay { bool isBefore(TimeOfDay other) { return hour < other.hour && minute < other.minute; } bool isAfter(TimeOfDay other) { return hour > other.hour && minute > other.minute; } TimeOfDay add({int hours = 0, int minutes = 0}) { return replacing(hour: hour + hours, minute: minute + minutes); } }