Index: trunk/FACT++/src/DataWriteFits.cc
===================================================================
--- trunk/FACT++/src/DataWriteFits.cc	(revision 12612)
+++ trunk/FACT++/src/DataWriteFits.cc	(revision 12613)
@@ -246,8 +246,15 @@
         const Time stop (fTstop[0],  fTstop[1]);
 
-        fFile.WriteKey("TSTART",   start.Iso(),
+        fFile.WriteKey("TSTARTI",  floor(start.Unix()),
+                       "Time when first event received (integral part)");
+        fFile.WriteKey("TSTARTF",  modf(start.Unix(), 1),
+                       "Time when first event received (fractional part)");
+        fFile.WriteKey("TSTOPI",   floor(stop.Unix()),
+                       "Time when last event received (integral part)");
+        fFile.WriteKey("TSTOPF",   modf(stop.Unix(), 1),
+                       "Time when last event received (fractional part)");
+        fFile.WriteKey("DATE-OBS", start.Iso(),
                        "Time when first event received");
-
-        fFile.WriteKey("TSTOP",    stop.Iso(),
+        fFile.WriteKey("DATE-END", stop.Iso(),
                        "Time when last event received");