clear catalog metadata to get correct date/times when moving to a different time zone

lib/main.dart

@@ -10,6 +10,7 @@ import 'package:aves/widgets/common/fake_app_bar.dart';
 import 'package:aves/widgets/common/icons.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_native_timezone/flutter_native_timezone.dart';
 import 'package:permission_handler/permission_handler.dart';
 
 void main() {
@@ -58,19 +59,26 @@ class _HomePageState extends State<HomePage> {
   }
 
   setup() async {
-    await androidFileUtils.init();
-    await IconUtils.init();
-    await settings.init();
-    localMediaCollection.groupFactor = settings.collectionGroupFactor;
-    localMediaCollection.sortFactor = settings.collectionSortFactor;
-
     final permissions = await PermissionHandler().requestPermissions([PermissionGroup.storage]);
     if (permissions[PermissionGroup.storage] != PermissionStatus.granted) {
       SystemNavigator.pop();
       return;
     }
 
+    await androidFileUtils.init();
+    await IconUtils.init();
+    await settings.init();
+    localMediaCollection.groupFactor = settings.collectionGroupFactor;
+    localMediaCollection.sortFactor = settings.collectionSortFactor;
+
     await metadataDb.init();
+    final currentTimeZone = await FlutterNativeTimezone.getLocalTimezone();
+    final catalogTimeZone = settings.catalogTimeZone;
+    if (currentTimeZone != catalogTimeZone) {
+      // clear catalog metadata to get correct date/times when moving to a different time zone
+      await metadataDb.clearMetadataEntries();
+      settings.catalogTimeZone = currentTimeZone;
+    }
 
     eventChannel.receiveBroadcastStream().cast<Map>().listen(
           (entryMap) => localMediaCollection.add(ImageEntry.fromMap(entryMap)),

lib/model/metadata_db.dart

@@ -34,6 +34,12 @@ class MetadataDb {
     await init();
   }
 
+  clearMetadataEntries() async {
+    final db = await _database;
+    final count = await db.delete(metadataTable, where: '1');
+    debugPrint('$runtimeType clearMetadataEntries deleted $count entries');
+  }
+
   Future<List<CatalogMetadata>> loadMetadataEntries() async {
     final start = DateTime.now();
     final db = await _database;
@@ -57,6 +63,12 @@ class MetadataDb {
     debugPrint('$runtimeType saveMetadata complete in ${DateTime.now().difference(start).inMilliseconds}ms with ${metadataEntries.length} entries');
   }
 
+  clearAddresses() async {
+    final db = await _database;
+    final count = await db.delete(addressTable, where: '1');
+    debugPrint('$runtimeType clearAddresses deleted $count entries');
+  }
+
   Future<List<AddressDetails>> loadAddresses() async {
     final start = DateTime.now();
     final db = await _database;

lib/model/settings.dart

@@ -17,6 +17,7 @@ class Settings {
   static const collectionGroupFactorKey = 'collection_group_factor';
   static const collectionSortFactorKey = 'collection_sort_factor';
   static const infoMapZoomKey = 'info_map_zoom';
+  static const catalogTimeZoneKey = 'catalog_time_zone';
 
   init() async {
     prefs = await SharedPreferences.getInstance();
@@ -46,6 +47,10 @@ class Settings {
 
   set infoMapZoom(double newValue) => setAndNotify(infoMapZoomKey, newValue);
 
+  String get catalogTimeZone => prefs.getString(catalogTimeZoneKey) ?? '';
+
+  set catalogTimeZone(String newValue) => setAndNotify(catalogTimeZoneKey, newValue);
+
   GroupFactor get collectionGroupFactor => getEnumOrDefault(collectionGroupFactorKey, GroupFactor.date, GroupFactor.values);
 
   set collectionGroupFactor(GroupFactor newValue) => setAndNotify(collectionGroupFactorKey, newValue.toString());

pubspec.lock

@@ -76,6 +76,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_native_timezone:
+    dependency: "direct main"
+    description:
+      name: flutter_native_timezone
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
   flutter_sticky_header:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -19,6 +19,7 @@ dependencies:
   chewie: 0.9.7
   collection:
   flushbar:
+  flutter_native_timezone:
   flutter_sticky_header:
     git:
       url: git://github.com/deckerst/flutter_sticky_header.git