Index: openacs-4/packages/calendar-portlet/www/calendar-full-portlet.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar-portlet/www/calendar-full-portlet.tcl,v
diff -u -N -r1.41.2.2 -r1.41.2.3
--- openacs-4/packages/calendar-portlet/www/calendar-full-portlet.tcl	4 Feb 2017 13:19:55 -0000	1.41.2.2
+++ openacs-4/packages/calendar-portlet/www/calendar-full-portlet.tcl	13 Feb 2017 10:55:46 -0000	1.41.2.3
@@ -24,7 +24,7 @@
     {view ""}
     {page_num:naturalnum ""}
     {date ""}
-    {period_days:optional}
+    {period_days:naturalnum,optional}
     {julian_date ""}
 } -properties {