fix hopefully #15

lib/src/model/messages_model.dart

@@ -8,6 +8,7 @@ import 'package:twonly/src/app.dart';
 import 'package:twonly/src/components/message_send_state_icon.dart';
 import 'package:twonly/src/model/json/message.dart';
 import 'package:twonly/src/providers/api/api.dart';
+import 'package:twonly/src/utils/misc.dart';
 
 class DbMessage {
   DbMessage({
@@ -383,7 +384,9 @@ class DbMessages extends CvModelBase {
         if (messageOpenedAt != null) {
           messageOpenedAt = DateTime.tryParse(fromDb[i][columnMessageOpenedAt]);
           if (tmp is TextMessageContent && messageOpenedAt != null) {
-            if ((DateTime.now()).difference(messageOpenedAt).inHours >= 24) {
+            if (calculateTimeDifference(DateTime.now(), messageOpenedAt)
+                    .inHours >=
+                24) {
               deleteTextContent(fromDb[i][columnMessageId], tmp);
             }
           }

lib/src/utils/misc.dart

@@ -152,7 +152,7 @@ int getFlameCounter(List<DateTime> dates) {
   int flamesCount = 0;
   DateTime lastFlameCount = DateTime.now();
 
-  if (dates[0].difference(lastFlameCount).inDays == 0) {
+  if (calculateTimeDifference(dates[0], lastFlameCount).inDays == 0) {
     flamesCount = 1;
     lastFlameCount = dates[0];
   }
@@ -161,7 +161,7 @@ int getFlameCounter(List<DateTime> dates) {
   for (int i = 1; i < dates.length; i++) {
     // print(
     //     "${dates[i]} ${dates[i].difference(dates[i - 1]).inDays} ${dates[i].difference(lastFlameCount).inDays}");
-    if (dates[i].difference(dates[i - 1]).inDays == 0) {
+    if (calculateTimeDifference(dates[i], dates[i - 1]).inDays == 0) {
       if (lastFlameCount.difference(dates[i]).inDays == 1) {
         flamesCount++;
         lastFlameCount = dates[i];
@@ -190,3 +190,16 @@ Future<int> getFlamesForOtherUser(int otherUserId) async {
   // print("Received $a and send $b");
   return min(a, b);
 }
+
+Duration calculateTimeDifference(DateTime now, DateTime startTime) {
+  // Get the timezone offsets
+  Duration nowOffset = now.timeZoneOffset;
+  Duration startTimeOffset = startTime.timeZoneOffset;
+
+  // Convert both DateTime objects to UTC
+  DateTime nowInUTC = now.subtract(nowOffset);
+  DateTime startTimeInUTC = startTime.subtract(startTimeOffset);
+
+  // Calculate the difference
+  return nowInUTC.difference(startTimeInUTC);
+}

lib/src/views/chats/chat_item_details_view.dart

@@ -224,8 +224,8 @@ class _ChatItemDetailsViewState extends State<ChatItemDetailsView> {
                               messages[i].messageOtherId != null);
                 }
                 if (messages[i].messageOpenedAt != null) {
-                  if ((DateTime.now())
+                  if (calculateTimeDifference(
-                          .difference(messages[i].messageOpenedAt!)
+                              DateTime.now(), messages[i].messageOpenedAt!)
                           .inHours >=
                       24) {
                     return Container();

lib/src/views/chats/chat_list_view.dart

@@ -158,7 +158,8 @@ class _UserListItem extends State<UserListItem> {
   Widget build(BuildContext context) {
     if (widget.lastMessage != null) {
       lastMessageInSeconds =
-          DateTime.now().difference(widget.lastMessage!.sendAt).inSeconds;
+          calculateTimeDifference(DateTime.now(), widget.lastMessage!.sendAt)
+              .inSeconds;
 
       state = widget.lastMessage!.getSendState();
 

test/time_difference_test.dart

@@ -0,0 +1,31 @@
+// Function to calculate time difference
+import 'package:flutter_test/flutter_test.dart';
+import 'package:twonly/src/utils/misc.dart';
+
+void main() {
+  test('Time difference calculation between different time zones', () {
+    // Test case 1: Current time is in UTC and start time is in UTC+2
+    DateTime now = DateTime.parse('2023-10-01T10:00:00Z'); // 10:00 UTC
+    DateTime startTime =
+        DateTime.parse('2023-10-01T12:00:00+02:00'); // 12:00 UTC+2
+
+    Duration difference = calculateTimeDifference(now, startTime);
+    expect(difference.inHours, equals(0)); // 10:00 UTC - 12:00 UTC+2 = 0 hours
+
+    // Test case 2: Current time is in UTC-1 and start time is in UTC+1
+    now = DateTime.parse('2023-10-01T09:00:00-01:00'); // 09:00 UTC-1
+    startTime = DateTime.parse('2023-10-01T11:00:00+01:00'); // 11:00 UTC+1
+
+    difference = calculateTimeDifference(now, startTime);
+    expect(
+        difference.inHours, equals(0)); // 09:00 UTC-1 - 11:00 UTC+1 = 0 hours
+
+    // Test case 3: Current time is in UTC+3 and start time is in UTC-1
+    now = DateTime.parse('2023-10-01T15:00:00+03:00'); // 15:00 UTC+3
+    startTime = DateTime.parse('2023-10-01T13:00:00-01:00'); // 13:00 UTC-1
+
+    difference = calculateTimeDifference(now, startTime);
+    expect(
+        difference.inHours, equals(-2)); // 15:00 UTC+3 - 13:00 UTC-1 = -2 hours
+  });
+}