Index: openacs-4/packages/xowiki/tcl/package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/package-procs.tcl,v
diff -u -r1.332.2.79 -r1.332.2.80
--- openacs-4/packages/xowiki/tcl/package-procs.tcl	20 Apr 2021 09:20:34 -0000	1.332.2.79
+++ openacs-4/packages/xowiki/tcl/package-procs.tcl	20 Apr 2021 10:01:25 -0000	1.332.2.80
@@ -2420,11 +2420,10 @@
       set title [:get_parameter PackageTitle [:instance_name]]
     }
     set description [:get_parameter PackageDescription ""]
-
-    if {![info exists days] &&
-        [string is integer -strict [:query_parameter rss]]} {
+    
+    if {![info exists days]
+        && [regexp {[^0-9]*([0-9]+)d} [:query_parameter rss] _ days]} {
       # setting the variable days
-      set days [:query_parameter rss]
     } else {
       set days 10
     }