diff --git a/src/ctselect/ctselect.cpp b/src/ctselect/ctselect.cpp
index f462b35..a07b08b 100644
--- a/src/ctselect/ctselect.cpp
+++ b/src/ctselect/ctselect.cpp
@@ -545,8 +545,10 @@ void ctselect::select_events(GCTAObservation* obs, const std::string& filename)
     
         // Extract effective time interval in CTA reference time. We need
         // this reference for filtering.
-        double tmin = gti.tstart().convert(m_cta_ref);
-        double tmax = gti.tstop().convert(m_cta_ref);
+        //double tmin = gti.tstart().convert(m_cta_ref);
+        //double tmax = gti.tstop().convert(m_cta_ref);
+        double tmin = gti.tstart().secs() ;
+        double tmax = gti.tstop( ).secs() ;
 
         // Format time with sufficient accuracy and add to selection string
         sprintf(cmin, "%.8f", tmin);