Umstellung auf UTC Timestamp

lib/tools/util.dart

@@ -456,7 +456,7 @@ class DecimalTextInputFormatter extends TextInputFormatter {
 }
 
 bool isJobTooFarInFuture(Job job) {
-  var ordertime = DateTime.parse(job.ordertime).toUtc().millisecondsSinceEpoch;
+  var ordertime = job.ordertime * 1000; // convert seconds to milliseconds
   var dateTimeThreshold = DateTime.now().add(Duration(minutes: job.offsWarn)).toUtc().millisecondsSinceEpoch;
 
   return ordertime > dateTimeThreshold;