diff --git a/lib/models/settings.dart b/lib/models/settings.dart
index 83fad43..dfa79be 100644
--- a/lib/models/settings.dart
+++ b/lib/models/settings.dart
@@ -6,9 +6,10 @@ class Settings {
   final QueryConfig? moodQuery;
   final QueryConfig? sleepQuery;
   final TimeConfig? chessTime;
+  final DateTime startedAt;
 
   Settings(this.group, this.relapseCategories, this.moodQuery, this.sleepQuery,
-      this.chessTime);
+      this.chessTime, this.startedAt);
 
   Settings.fromJson(Map<String, dynamic> json)
       : group = json['group'] as int,
@@ -17,7 +18,8 @@ class Settings {
         sleepQuery = QueryConfig.fromJson(json['sleep_query']),
         chessTime = json['chess_time'] != null
             ? TimeConfig.fromJson(json['chess_time'])
-            : null;
+            : null,
+        startedAt = DateTime.parse(json['startedAt']);
 }
 
 class QueryConfig {
diff --git a/lib/services/settings_service.dart b/lib/services/settings_service.dart
index f28556a..ec8a656 100644
--- a/lib/services/settings_service.dart
+++ b/lib/services/settings_service.dart
@@ -23,6 +23,8 @@ Future<int?> getMoodQueryMinutes() => _getIntSetting('mood_query_minutes');
 Future<int?> getChessHours() => _getIntSetting('chess_hours');
 Future<int?> getChessMinutes() => _getIntSetting('chess_minutes');
 
+Future<String?> getStartDay() => _getStringSetting('startedAt');
+
 void _setIntSetting(String settingKey, int settingValue) =>
     SharedPreferences.getInstance()
         .then((pref) => pref.setInt(settingKey, settingValue));
@@ -30,6 +32,13 @@ void _setIntSetting(String settingKey, int settingValue) =>
 Future<int?> _getIntSetting(String settingKey) =>
     SharedPreferences.getInstance().then((pref) => pref.getInt(settingKey));
 
+void _setStringSetting(String settingKey, String settingValue) =>
+    SharedPreferences.getInstance()
+        .then((pref) => pref.setString(settingKey, settingValue));
+
+Future<String?> _getStringSetting(String settingKey) =>
+    SharedPreferences.getInstance().then((pref) => pref.getString(settingKey));
+
 void _setStringListSetting(String settingKey, List<String> list) =>
     SharedPreferences.getInstance()
         .then((pref) => pref.setStringList(settingKey, list));
@@ -40,6 +49,7 @@ Future<List<String>?> _getStringListSetting(String settingKey) =>
 
 Future<void> loadSettingsFromLocalJSON() async {
   Map<String, dynamic> configJSON = await loadLocalConfigJSON();
+  configJSON['startedAt'] = DateTime.now().toIso8601String();
   Settings settings = Settings.fromJson(configJSON);
   saveSettings(settings);
 }
@@ -53,6 +63,7 @@ void saveSettings(Settings settings) {
   _setStringListSetting('sleep_query_days', settings.sleepQuery!.days!);
   _setIntSetting('sleep_query_hours', settings.sleepQuery!.hours!);
   _setIntSetting('sleep_query_minutes', settings.sleepQuery!.minutes!);
+  _setStringSetting('startedAt', DateTime.now().toIso8601String());
   if (settings.chessTime != null) {
     _setIntSetting('chess_hours', settings.chessTime!.hours!);
     _setIntSetting('chess_minutes', settings.chessTime!.minutes!);
@@ -70,6 +81,8 @@ Future<Settings?> loadSettings() async {
   List<String>? sleepDays = await getSleepQueryDaysCategories();
   int? chessHours = await getChessHours();
   int? chessMinutes = await getChessMinutes();
+  DateTime startedAt =
+      DateTime.parse(await getStartDay() ?? DateTime.now().toIso8601String());
 
   if (group != null) {
     return Settings(
@@ -77,7 +90,8 @@ Future<Settings?> loadSettings() async {
         relapseCategories,
         QueryConfig(moodHours, moodMinutes, moodDays),
         QueryConfig(sleepHours, sleepMinutes, sleepDays),
-        TimeConfig(chessHours, chessMinutes));
+        TimeConfig(chessHours, chessMinutes),
+        startedAt);
   }
   return null;
 }