code fixes, added isSameOrAfter for DateTime objects, added check for teacher room and status

lib/extensions/dateTime.dart

@@ -16,4 +16,15 @@ extension IsSameDay on DateTime {
   TimeOfDay toTimeOfDay() {
     return TimeOfDay(hour: hour, minute: minute);
   }
+
+  bool isSameDateTime(DateTime other) {
+    bool isSameDay = this.isSameDay(other);
+    bool isSameTimeOfDay = (toTimeOfDay() == other.toTimeOfDay());
+
+    return isSameDay && isSameTimeOfDay;
+  }
+
+  bool isSameOrAfter(DateTime other) {
+    return isSameDateTime(other) || isAfter(other);
+  }
 }