folder restructuring

lib/extensions/date_time.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+
+extension IsSameDay on DateTime {
+  bool isSameDay(DateTime other) => year == other.year && month == other.month && day == other.day;
+
+  DateTime nextWeekday(int day) => add(Duration(days: (day - weekday) % DateTime.daysPerWeek));
+
+  DateTime withTime(TimeOfDay time) => copyWith(hour: time.hour, minute: time.minute);
+
+  TimeOfDay toTimeOfDay() => TimeOfDay(hour: hour, minute: minute);
+
+  bool isSameDateTime(DateTime other) {
+    var isSameDay = this.isSameDay(other);
+    var isSameTimeOfDay = (toTimeOfDay() == other.toTimeOfDay());
+
+    return isSameDay && isSameTimeOfDay;
+  }
+
+  bool isSameOrAfter(DateTime other) => isSameDateTime(other) || isAfter(other);
+}