Index: trunk/ppStack/src/ppStackConvolve.c
===================================================================
--- trunk/ppStack/src/ppStackConvolve.c	(revision 28565)
+++ trunk/ppStack/src/ppStackConvolve.c	(revision 29283)
@@ -295,4 +295,13 @@
         UPDATE_CONCEPT(unconvCell, "CELL.DARKTIME", NAN);
         UPDATE_CONCEPT(unconvFPA,  "FPA.ZP",        options->zp);
+
+        if (options->stats) {
+            psTime *fpaTime = psMetadataLookupPtr(NULL, outFPA->concepts, "FPA.TIME");
+            psTimeConvert(fpaTime, PS_TIME_TAI); // is this necessary??
+            double time = psTimeToMJD(fpaTime);
+            psMetadataAddF64(options->stats, PS_LIST_TAIL, "MJD_OBS", PS_META_DUPLICATE_OK,
+                                 "Average MJD_OBS of inputs", time);
+
+        }
     }