Index: trunk/ippTools/src/pztool.c
===================================================================
--- trunk/ippTools/src/pztool.c	(revision 18244)
+++ trunk/ippTools/src/pztool.c	(revision 18305)
@@ -203,4 +203,5 @@
     PS_ASSERT_PTR_NON_NULL(config, false);
 
+    PXOPT_LOOKUP_BOOL(desc, config->args, "-desc", false);
     PXOPT_LOOKUP_U64(limit, config->args, "-limit", false, false);
     PXOPT_LOOKUP_BOOL(simple, config->args, "-simple", false);
@@ -225,5 +226,8 @@
     }
 
-    psStringAppend(&query, " ORDER BY summitExp.dateobs DESC");
+    psStringAppend(&query, " ORDER BY summitExp.dateobs");
+    if (desc) {
+        psStringAppend(&query, " DESC");
+    }
 
     // treat limit == 0 as "no limit"
@@ -268,4 +272,5 @@
     PS_ASSERT_PTR_NON_NULL(config, false);
 
+    PXOPT_LOOKUP_BOOL(desc, config->args, "-desc", false);
     PXOPT_LOOKUP_U64(limit, config->args, "-limit", false, false);
     PXOPT_LOOKUP_BOOL(simple, config->args, "-simple", false);
@@ -296,4 +301,9 @@
             psStringAppend(&query, " AND %s", whereClause);
             psFree(whereClause);
+        }
+
+        psStringAppend(&query, " ORDER BY dateobs");
+        if (desc) {
+            psStringAppend(&query, " DESC");
         }
 
Index: trunk/ippTools/src/pztoolConfig.c
===================================================================
--- trunk/ippTools/src/pztoolConfig.c	(revision 18244)
+++ trunk/ippTools/src/pztoolConfig.c	(revision 18305)
@@ -80,4 +80,6 @@
     psMetadataAddStr(pendingexpArgs, PS_LIST_TAIL, "-exp_type", 0,
             "define exposure type", NULL); 
+    psMetadataAddBool(pendingexpArgs, PS_LIST_TAIL, "-desc", 0,
+            "sort ouput in descending format", false);
     psMetadataAddU64(pendingexpArgs, PS_LIST_TAIL, "-limit",  0,
             "limit result set to N items", 0);
@@ -95,4 +97,6 @@
     psMetadataAddStr(pendingimfileArgs, PS_LIST_TAIL, "-exp_type", 0,
             "define exposure type", NULL); 
+    psMetadataAddBool(pendingimfileArgs, PS_LIST_TAIL, "-desc", 0,
+            "sort ouput in descending format", false);
     psMetadataAddU64(pendingimfileArgs, PS_LIST_TAIL, "-limit",  0,
             "limit result set to N items", 0);