feat:增加刷新日程提醒功能

lib/utils/date_utils.dart

@@ -7,3 +7,12 @@ String formatDate(DateTime date) {
 String formatTime(DateTime datetime) {
   return DateFormat('yyyy-MM-dd HH:mm:ss').format(datetime);
 }
+
+bool isToday(DateTime? date) {
+  if (date == null) return false;
+
+  final now = DateTime.now();
+  return date.year == now.year &&
+      date.month == now.month &&
+      date.day == now.day;
+}