validation date as utc and converting in orders

apps/mobile/packages/features/client/create_order/lib/src/data/repositories_impl/client_create_order_repository_impl.dart

@@ -191,17 +191,7 @@ class ClientCreateOrderRepositoryImpl
   }
 
   fdc.Timestamp _toTimestamp(DateTime dateTime) {
-    // Keep the selected local time as-is by treating it as UTC.
-    final DateTime utc = DateTime.utc(
-      dateTime.year,
-      dateTime.month,
-      dateTime.day,
-      dateTime.hour,
-      dateTime.minute,
-      dateTime.second,
-      dateTime.millisecond,
-      dateTime.microsecond,
-    );
+    final DateTime utc = dateTime.toUtc();
     final int seconds = utc.millisecondsSinceEpoch ~/ 1000;
     final int nanoseconds = (utc.microsecondsSinceEpoch % 1000000) * 1000;
     return fdc.Timestamp(nanoseconds, seconds);