fix: handle datetime outside the valid range supported by dart (#21526)

* fix: handle datetime outside the valid range supported by dart

* add tests for tryFromSecondsSinceEpoch

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/domain/services/local_sync.service.dart

@@ -6,6 +6,7 @@ import 'package:immich_mobile/domain/models/album/local_album.model.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/infrastructure/repositories/local_album.repository.dart';
 import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:immich_mobile/utils/datetime_helpers.dart';
 import 'package:immich_mobile/utils/diff.dart';
 import 'package:logging/logging.dart';
 import 'package:platform/platform.dart';
@@ -285,7 +286,7 @@ extension on Iterable<PlatformAlbum> {
       (e) => LocalAlbum(
         id: e.id,
         name: e.name,
-        updatedAt: e.updatedAt == null ? DateTime.now() : DateTime.fromMillisecondsSinceEpoch(e.updatedAt! * 1000),
+        updatedAt: tryFromSecondsSinceEpoch(e.updatedAt!) ?? DateTime.now(),
         assetCount: e.assetCount,
       ),
     ).toList();
@@ -300,8 +301,8 @@ extension on Iterable<PlatformAsset> {
         name: e.name,
         checksum: null,
         type: AssetType.values.elementAtOrNull(e.type) ?? AssetType.other,
-        createdAt: e.createdAt == null ? DateTime.now() : DateTime.fromMillisecondsSinceEpoch(e.createdAt! * 1000),
+        createdAt: tryFromSecondsSinceEpoch(e.createdAt!) ?? DateTime.now(),
-        updatedAt: e.updatedAt == null ? DateTime.now() : DateTime.fromMillisecondsSinceEpoch(e.updatedAt! * 1000),
+        updatedAt: tryFromSecondsSinceEpoch(e.updatedAt!) ?? DateTime.now(),
         width: e.width,
         height: e.height,
         durationInSeconds: e.durationInSeconds,

mobile/lib/utils/datetime_helpers.dart

@@ -0,0 +1,19 @@
+const int _maxMillisecondsSinceEpoch = 8640000000000000; // 275760-09-13
+const int _minMillisecondsSinceEpoch = -62135596800000; // 0001-01-01
+
+DateTime? tryFromSecondsSinceEpoch(int? secondsSinceEpoch) {
+  if (secondsSinceEpoch == null) {
+    return null;
+  }
+
+  final milliSeconds = secondsSinceEpoch * 1000;
+  if (milliSeconds < _minMillisecondsSinceEpoch || milliSeconds > _maxMillisecondsSinceEpoch) {
+    return null;
+  }
+
+  try {
+    return DateTime.fromMillisecondsSinceEpoch(milliSeconds);
+  } catch (e) {
+    return null;
+  }
+}

mobile/test/modules/utils/datetime_helpers_test.dart

@@ -0,0 +1,58 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/utils/datetime_helpers.dart';
+
+void main() {
+  group('tryFromSecondsSinceEpoch', () {
+    test('returns null for null input', () {
+      final result = tryFromSecondsSinceEpoch(null);
+      expect(result, isNull);
+    });
+
+    test('returns null for value below minimum allowed range', () {
+      // _minMillisecondsSinceEpoch = -62135596800000
+      final seconds = -62135596800000 ~/ 1000 - 1; // One second before min allowed
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result, isNull);
+    });
+
+    test('returns null for value above maximum allowed range', () {
+      // _maxMillisecondsSinceEpoch = 8640000000000000
+      final seconds = 8640000000000000 ~/ 1000 + 1; // One second after max allowed
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result, isNull);
+    });
+
+    test('returns correct DateTime for minimum allowed value', () {
+      final seconds = -62135596800000 ~/ 1000; // Minimum allowed timestamp
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result, DateTime.fromMillisecondsSinceEpoch(-62135596800000));
+    });
+
+    test('returns correct DateTime for maximum allowed value', () {
+      final seconds = 8640000000000000 ~/ 1000; // Maximum allowed timestamp
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result, DateTime.fromMillisecondsSinceEpoch(8640000000000000));
+    });
+
+    test('returns correct DateTime for negative timestamp', () {
+      final seconds = -1577836800; // Dec 31, 1919 (pre-epoch)
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result, DateTime.fromMillisecondsSinceEpoch(-1577836800 * 1000));
+    });
+
+    test('returns correct DateTime for zero timestamp', () {
+      final seconds = 0; // Jan 1, 1970 (epoch)
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result, DateTime.fromMillisecondsSinceEpoch(0));
+    });
+
+    test('returns correct DateTime for recent timestamp', () {
+      final now = DateTime.now();
+      final seconds = now.millisecondsSinceEpoch ~/ 1000;
+      final result = tryFromSecondsSinceEpoch(seconds);
+      expect(result?.year, now.year);
+      expect(result?.month, now.month);
+      expect(result?.day, now.day);
+    });
+  });
+}