Added custom date setter and dev feature flag

lib/application/app_clock.dart

@@ -0,0 +1,36 @@
+const bool kEnableTestingDateOverride = bool.fromEnvironment(
+  'ENABLE_TESTING_DATE',
+  defaultValue: false,
+);
+
+class AppClock {
+  DateTime? _overrideDate;
+
+  DateTime now() {
+    final overrideDate = _overrideDate;
+    if (overrideDate == null) {
+      return DateTime.now();
+    }
+    final systemNow = DateTime.now();
+    return DateTime(
+      overrideDate.year,
+      overrideDate.month,
+      overrideDate.day,
+      systemNow.hour,
+      systemNow.minute,
+      systemNow.second,
+      systemNow.millisecond,
+      systemNow.microsecond,
+    );
+  }
+
+  DateTime? get overrideDate => _overrideDate;
+
+  void setOverrideDate(DateTime? value) {
+    if (value == null) {
+      _overrideDate = null;
+      return;
+    }
+    _overrideDate = DateTime(value.year, value.month, value.day);
+  }
+}

lib/application/app_dependencies.dart

@@ -1,3 +1,4 @@
+import 'package:subctrl/application/app_clock.dart';
 import 'package:subctrl/application/currencies/add_custom_currency_use_case.dart';
 import 'package:subctrl/application/currencies/delete_custom_currency_use_case.dart';
 import 'package:subctrl/application/currencies/get_currencies_use_case.dart';
@@ -19,11 +20,13 @@ import 'package:subctrl/application/settings/get_locale_code_use_case.dart';
 import 'package:subctrl/application/settings/get_notification_reminder_offset_use_case.dart';
 import 'package:subctrl/application/settings/get_notifications_enabled_use_case.dart';
 import 'package:subctrl/application/settings/get_theme_preference_use_case.dart';
+import 'package:subctrl/application/settings/get_testing_date_override_use_case.dart';
 import 'package:subctrl/application/settings/set_base_currency_code_use_case.dart';
 import 'package:subctrl/application/settings/set_currency_rates_auto_download_use_case.dart';
 import 'package:subctrl/application/settings/set_locale_code_use_case.dart';
 import 'package:subctrl/application/settings/set_notification_reminder_offset_use_case.dart';
 import 'package:subctrl/application/settings/set_notifications_enabled_use_case.dart';
+import 'package:subctrl/application/settings/set_testing_date_override_use_case.dart';
 import 'package:subctrl/application/settings/set_theme_preference_use_case.dart';
 import 'package:subctrl/application/subscriptions/add_subscription_use_case.dart';
 import 'package:subctrl/application/subscriptions/delete_subscription_use_case.dart';
@@ -83,11 +86,14 @@ class AppDependencies {
     required this.setNotificationsEnabledUseCase,
     required this.getNotificationReminderOffsetUseCase,
     required this.setNotificationReminderOffsetUseCase,
+    required this.getTestingDateOverrideUseCase,
+    required this.setTestingDateOverrideUseCase,
     required this.getPendingNotificationsUseCase,
     required this.cancelNotificationsUseCase,
     required this.scheduleNotificationsUseCase,
     required this.requestNotificationPermissionUseCase,
     required this.openNotificationSettingsUseCase,
+    required this.appClock,
     required YahooFinanceCurrencyClient yahooFinanceCurrencyClient,
   }) : _yahooFinanceCurrencyClient = yahooFinanceCurrencyClient;
 
@@ -112,6 +118,7 @@ class AppDependencies {
       yahooFinanceCurrencyClient: yahooFinanceClient,
       currencyRepository: currencyRepository,
     );
+    final appClock = AppClock();
     final localNotificationsService = LocalNotificationsService();
     final notificationPermissionService = NotificationPermissionService();
 
@@ -128,6 +135,7 @@ class AppDependencies {
       ),
       refreshOverdueNextPaymentsUseCase: RefreshOverdueNextPaymentsUseCase(
         subscriptionRepository,
+        nowProvider: appClock.now,
       ),
       watchCurrenciesUseCase: WatchCurrenciesUseCase(currencyRepository),
       getCurrenciesUseCase: GetCurrenciesUseCase(currencyRepository),
@@ -179,6 +187,12 @@ class AppDependencies {
           GetNotificationReminderOffsetUseCase(settingsRepository),
       setNotificationReminderOffsetUseCase:
           SetNotificationReminderOffsetUseCase(settingsRepository),
+      getTestingDateOverrideUseCase: GetTestingDateOverrideUseCase(
+        settingsRepository,
+      ),
+      setTestingDateOverrideUseCase: SetTestingDateOverrideUseCase(
+        settingsRepository,
+      ),
       getPendingNotificationsUseCase: GetPendingNotificationsUseCase(
         localNotificationsService,
       ),
@@ -194,6 +208,7 @@ class AppDependencies {
       openNotificationSettingsUseCase: OpenNotificationSettingsUseCase(
         notificationPermissionService,
       ),
+      appClock: appClock,
       yahooFinanceCurrencyClient: yahooFinanceClient,
     );
   }
@@ -235,12 +250,15 @@ class AppDependencies {
   getNotificationReminderOffsetUseCase;
   final SetNotificationReminderOffsetUseCase
   setNotificationReminderOffsetUseCase;
+  final GetTestingDateOverrideUseCase getTestingDateOverrideUseCase;
+  final SetTestingDateOverrideUseCase setTestingDateOverrideUseCase;
   final GetPendingNotificationsUseCase getPendingNotificationsUseCase;
   final CancelNotificationsUseCase cancelNotificationsUseCase;
   final ScheduleNotificationsUseCase scheduleNotificationsUseCase;
   final RequestNotificationPermissionUseCase
   requestNotificationPermissionUseCase;
   final OpenNotificationSettingsUseCase openNotificationSettingsUseCase;
+  final AppClock appClock;
 
   final YahooFinanceCurrencyClient _yahooFinanceCurrencyClient;
 

lib/application/settings/get_testing_date_override_use_case.dart

@@ -0,0 +1,11 @@
+import 'package:subctrl/domain/repositories/settings_repository.dart';
+
+class GetTestingDateOverrideUseCase {
+  GetTestingDateOverrideUseCase(this._repository);
+
+  final SettingsRepository _repository;
+
+  Future<DateTime?> call() {
+    return _repository.getTestingDateOverride();
+  }
+}

lib/application/settings/set_testing_date_override_use_case.dart

@@ -0,0 +1,11 @@
+import 'package:subctrl/domain/repositories/settings_repository.dart';
+
+class SetTestingDateOverrideUseCase {
+  SetTestingDateOverrideUseCase(this._repository);
+
+  final SettingsRepository _repository;
+
+  Future<void> call(DateTime? value) {
+    return _repository.setTestingDateOverride(value);
+  }
+}

lib/domain/repositories/settings_repository.dart

@@ -22,4 +22,8 @@ abstract class SettingsRepository {
   Future<String?> getNotificationReminderOffset();
 
   Future<void> setNotificationReminderOffset(String value);
+
+  Future<DateTime?> getTestingDateOverride();
+
+  Future<void> setTestingDateOverride(DateTime? value);
 }

lib/infrastructure/repositories/drift_settings_repository.dart

@@ -14,6 +14,7 @@ class DriftSettingsRepository implements SettingsRepository {
   static const _notificationsEnabledKey = 'notifications_enabled';
   static const _notificationReminderOffsetKey =
       'notification_reminder_offset';
+  static const _testingDateOverrideKey = 'testing_date_override';
 
   @override
   Future<String?> getBaseCurrencyCode() {
@@ -85,4 +86,24 @@ class DriftSettingsRepository implements SettingsRepository {
   Future<void> setNotificationReminderOffset(String value) {
     return _dao.saveSetting(_notificationReminderOffsetKey, value);
   }
+
+  @override
+  Future<DateTime?> getTestingDateOverride() async {
+    final stored = await _dao.getSetting(_testingDateOverrideKey);
+    if (stored == null || stored.isEmpty) {
+      return null;
+    }
+    return DateTime.tryParse(stored);
+  }
+
+  @override
+  Future<void> setTestingDateOverride(DateTime? value) {
+    final stored = value == null ? null : _formatDate(value);
+    return _dao.saveSetting(_testingDateOverrideKey, stored);
+  }
+
+  String _formatDate(DateTime value) {
+    final normalized = DateTime(value.year, value.month, value.day);
+    return normalized.toIso8601String().split('T').first;
+  }
 }

lib/main.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/services.dart';
+import 'package:subctrl/application/app_clock.dart';
 import 'package:subctrl/application/app_dependencies.dart';
 import 'package:subctrl/domain/entities/notification_reminder_option.dart';
 import 'package:subctrl/presentation/l10n/app_localizations.dart';
@@ -33,6 +34,7 @@ class _SubctrlAppState extends State<SubctrlApp> {
   bool _areNotificationsEnabled = false;
   NotificationReminderOption _notificationReminderOption =
       NotificationReminderOption.twoDaysBefore;
+  DateTime? _testingDateOverride;
   late final AppDependencies _dependencies;
 
   @override
@@ -66,6 +68,9 @@ class _SubctrlAppState extends State<SubctrlApp> {
         .getNotificationsEnabledUseCase();
     final storedReminder = await _dependencies
         .getNotificationReminderOffsetUseCase();
+    final storedTestingDate = kEnableTestingDateOverride
+        ? await _dependencies.getTestingDateOverrideUseCase()
+        : null;
     final reminderOption = NotificationReminderOption.fromStorage(
       storedReminder,
     );
@@ -92,7 +97,13 @@ class _SubctrlAppState extends State<SubctrlApp> {
       _isCurrencyRatesAutoDownloadEnabled = shouldDownloadRates;
       _areNotificationsEnabled = shouldEnableNotifications;
       _notificationReminderOption = reminderOption;
+      _testingDateOverride = storedTestingDate;
     });
+    if (kEnableTestingDateOverride) {
+      _dependencies.appClock.setOverrideDate(storedTestingDate);
+    } else {
+      _dependencies.appClock.setOverrideDate(null);
+    }
 
     if (shouldPersistBaseCurrency) {
       await _dependencies.setBaseCurrencyCodeUseCase(storedBaseCurrency);
@@ -145,6 +156,14 @@ class _SubctrlAppState extends State<SubctrlApp> {
     );
   }
 
+  Future<void> _handleTestingDateOverrideChanged(DateTime? value) async {
+    setState(() {
+      _testingDateOverride = value;
+    });
+    _dependencies.appClock.setOverrideDate(value);
+    await _dependencies.setTestingDateOverrideUseCase(value);
+  }
+
   @override
   void dispose() {
     _dependencies.dispose();
@@ -186,6 +205,9 @@ class _SubctrlAppState extends State<SubctrlApp> {
         onNotificationsPreferenceChanged: _handleNotificationsPreferenceChanged,
         notificationReminderOption: _notificationReminderOption,
         onNotificationReminderChanged: _handleNotificationReminderChanged,
+        testingDateOverride: _testingDateOverride,
+        onTestingDateOverrideChanged: _handleTestingDateOverrideChanged,
+        nowProvider: _dependencies.appClock.now,
       ),
     );
   }
@@ -207,6 +229,9 @@ class HomeTabs extends StatelessWidget {
     required this.onNotificationsPreferenceChanged,
     required this.notificationReminderOption,
     required this.onNotificationReminderChanged,
+    required this.testingDateOverride,
+    required this.onTestingDateOverrideChanged,
+    required this.nowProvider,
   });
 
   final AppDependencies dependencies;
@@ -222,6 +247,9 @@ class HomeTabs extends StatelessWidget {
   final ValueChanged<bool> onNotificationsPreferenceChanged;
   final NotificationReminderOption notificationReminderOption;
   final NotificationReminderChangedCallback onNotificationReminderChanged;
+  final DateTime? testingDateOverride;
+  final TestingDateOverrideChangedCallback onTestingDateOverrideChanged;
+  final DateTime Function() nowProvider;
 
   @override
   Widget build(BuildContext context) {
@@ -231,6 +259,7 @@ class HomeTabs extends StatelessWidget {
     final baseCurrencyKey = baseCurrencyCode ?? 'none';
     final notificationsKey = notificationsEnabled ? 'on' : 'off';
     final reminderKey = notificationReminderOption.storageValue;
+    final testingDateKey = testingDateOverride?.toIso8601String() ?? 'system';
 
     return CupertinoTabScaffold(
       tabBar: CupertinoTabBar(
@@ -250,11 +279,11 @@ class HomeTabs extends StatelessWidget {
           key: index == 0
               ? ValueKey(
                   'subscriptions-$themeKey-$localeKey-$baseCurrencyKey-'
-                  '$notificationsKey-$reminderKey',
+                  '$notificationsKey-$reminderKey-$testingDateKey',
                 )
               : ValueKey(
                   'analytics-$themeKey-$localeKey-$baseCurrencyKey-'
-                  '$notificationsKey-$reminderKey',
+                  '$notificationsKey-$reminderKey-$testingDateKey',
                 ),
           builder: (context) {
             switch (index) {
@@ -276,6 +305,10 @@ class HomeTabs extends StatelessWidget {
                       onNotificationsPreferenceChanged,
                   notificationReminderOption: notificationReminderOption,
                   onNotificationReminderChanged: onNotificationReminderChanged,
+                  testingDateOverride: testingDateOverride,
+                  onTestingDateOverrideChanged:
+                      onTestingDateOverrideChanged,
+                  nowProvider: nowProvider,
                 );
               case 1:
                 return AnalyticsScreen(
@@ -295,6 +328,10 @@ class HomeTabs extends StatelessWidget {
                       onNotificationsPreferenceChanged,
                   notificationReminderOption: notificationReminderOption,
                   onNotificationReminderChanged: onNotificationReminderChanged,
+                  testingDateOverride: testingDateOverride,
+                  onTestingDateOverrideChanged:
+                      onTestingDateOverrideChanged,
+                  nowProvider: nowProvider,
                 );
               default:
                 return const SizedBox.shrink();

lib/presentation/l10n/app_localizations.dart

@@ -61,6 +61,10 @@ class AppLocalizations {
       'notificationReminderBody': '{name} will renew on {date}',
       'settingsCurrenciesSection': 'Currencies',
       'settingsCurrenciesManage': 'Manage currencies',
+      'settingsTestingSection': 'Testing',
+      'settingsTestingDateLabel': 'Testing date',
+      'settingsTestingDateSystem': 'System date',
+      'settingsTestingDateReset': 'Use system date',
       'settingsTagsSection': 'Tags',
       'settingsTagsManage': 'Manage tags',
       'settingsTagsTitle': 'Tags',
@@ -208,6 +212,10 @@ class AppLocalizations {
       'notificationReminderBody': '{name} — будет продлена {date}',
       'settingsCurrenciesSection': 'Валюты',
       'settingsCurrenciesManage': 'Управление списком',
+      'settingsTestingSection': 'Тестирование',
+      'settingsTestingDateLabel': 'Тестовая дата',
+      'settingsTestingDateSystem': 'Дата системы',
+      'settingsTestingDateReset': 'Использовать дату системы',
       'settingsTagsSection': 'Теги',
       'settingsTagsManage': 'Управление тегами',
       'settingsTagsTitle': 'Теги',
@@ -398,6 +406,12 @@ class AppLocalizations {
   String get settingsCurrenciesSection =>
       _strings['settingsCurrenciesSection']!;
   String get settingsCurrenciesManage => _strings['settingsCurrenciesManage']!;
+  String get settingsTestingSection => _strings['settingsTestingSection']!;
+  String get settingsTestingDateLabel => _strings['settingsTestingDateLabel']!;
+  String get settingsTestingDateSystem =>
+      _strings['settingsTestingDateSystem']!;
+  String get settingsTestingDateReset =>
+      _strings['settingsTestingDateReset']!;
   String get settingsTagsSection => _strings['settingsTagsSection']!;
   String get settingsTagsManage => _strings['settingsTagsManage']!;
   String get settingsTagsTitle => _strings['settingsTagsTitle']!;