diff --git a/widgets/mainwindow.cpp b/widgets/mainwindow.cpp
index 357d99644..44a1af29e 100644
--- a/widgets/mainwindow.cpp
+++ b/widgets/mainwindow.cpp
@@ -3027,8 +3027,8 @@ void MainWindow::decode()                                       //decode()
     dec_data.params.nutc=dec_data.params.nutc/100;
   }
   if(dec_data.params.nagain==0 && dec_data.params.newdat==1 && (!m_diskData)) {
-    auto t_start = qt_truncate_date_time_to (QDateTime::currentDateTimeUtc (), m_TRperiod * 1.e3);
-    auto t = t_start.time ();
+    m_dateTimeSeqStart = qt_truncate_date_time_to (QDateTime::currentDateTimeUtc (), m_TRperiod * 1.e3);
+    auto t = m_dateTimeSeqStart.time ();
     dec_data.params.nutc = t.hour () * 100 + t.minute ();
     if (m_TRperiod < 60.)
       {