fixed empty calendar dates could be selected

lib/extensions/date.dart

@@ -2,4 +2,7 @@ extension DateExtensions on DateTime {
   bool isSameDay(final DateTime other) {
     return year == other.year && month == other.month && day == other.day;
   }
+
+  DateTime asNormalizedDate() => DateTime(year, month, day);
+  DateTime asNormalizedDateTime() => DateTime(year, month, day, hour, minute);
 }

lib/managers/calendar_manager.dart

@@ -1,3 +1,4 @@
+import 'package:share_location/extensions/date.dart';
 import 'package:share_location/foreign_types/memory.dart';
 import 'package:share_location/helpers/iterate_months.dart';
 
@@ -8,15 +9,12 @@ class CalendarManager {
     required final List<Memory> memories,
   }) : _values = mapFromMemoriesList(memories);
 
-  static DateTime createDateKey(final DateTime date) =>
-      DateTime(date.year, date.month, date.day);
-
   static Map<DateTime, Set<String>> mapFromMemoriesList(
       final List<Memory> memories) {
     final map = <DateTime, Set<String>>{};
 
     for (final memory in memories) {
-      final key = createDateKey(memory.creationDate);
+      final key = memory.creationDate.asNormalizedDate();
 
       if (map.containsKey(key)) {
         map[key]!.add(memory.id);

lib/models/timeline.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:math';
 
 import 'package:property_change_notifier/property_change_notifier.dart';
+import 'package:share_location/extensions/date.dart';
 import 'package:share_location/foreign_types/memory.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 
@@ -43,9 +44,6 @@ class TimelineModel extends PropertyChangeNotifier<String> {
     _timeline.removeWhere((key, memories) => memories.isEmpty);
   }
 
-  static DateTime createDateKey(final DateTime date) =>
-      DateTime(date.year, date.month, date.day);
-
   void restoreOverlay() => setShowOverlay(true);
   void hideOverlay() => setShowOverlay(false);
 
@@ -55,7 +53,7 @@ class TimelineModel extends PropertyChangeNotifier<String> {
     final map = <DateTime, List<Memory>>{};
 
     for (final memory in memories) {
-      final key = createDateKey(memory.creationDate);
+      final key = memory.creationDate.asNormalizedDate();
 
       if (map.containsKey(key)) {
         map[key]!.add(memory);

lib/widgets/calendar_month.dart

@@ -5,6 +5,7 @@ import 'package:flutter_calendar_widget/flutter_calendar_widget.dart';
 import 'package:intl/intl.dart';
 import 'package:share_location/constants/spacing.dart';
 import 'package:share_location/constants/values.dart';
+import 'package:share_location/extensions/date.dart';
 import 'package:share_location/screens/timeline_screen.dart';
 import 'package:share_location/widgets/delay_render.dart';
 import 'package:share_location/widgets/fade_and_move_in_animation.dart';
@@ -113,6 +114,8 @@ class CalendarMonth extends StatelessWidget {
   DateTime get firstDate => DateTime(year, month, 1);
   DateTime get lastDate =>
       DateTime(year, month, DateUtils.getDaysInMonth(year, month));
+  bool doesDateExist(final DateTime date) =>
+      dayAmountMap.keys.contains(date.asNormalizedDate());
 
   @override
   Widget build(BuildContext context) {
@@ -139,6 +142,10 @@ class CalendarMonth extends StatelessWidget {
       maxDate: lastDate,
       startingDayOfWeek: DayOfWeek.mon,
       onDayPressed: (date) {
+        if (!doesDateExist(date)) {
+          return;
+        }
+
         Navigator.push(
           context,
           MaterialPageRoute(