Umstellung auf UTC Timestamp

lib/tools/util.dart

@@ -18,10 +18,7 @@ import '../Tools/colored_safe_area.dart';
 class Util {
   static late SharedPreferences prefs;
 
-  // DateTime → UTC Unix timestamps
-  static int toUnixMillisUtc(DateTime dt) => dt.toUtc().millisecondsSinceEpoch;
-  static int nowUnixMillisUtc() => DateTime.now().toUtc().millisecondsSinceEpoch;
-  // Optional: Unix seconds
+  static int nowUnixSecondsUtc() => DateTime.now().toUtc().millisecondsSinceEpoch ~/ 1000;
   static int toUnixSecondsUtc(DateTime dt) => dt.toUtc().millisecondsSinceEpoch ~/ 1000;