Index: openacs-4/packages/calendar-portlet/www/calendar-list-portlet.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar-portlet/www/calendar-list-portlet.tcl,v
diff -u -r1.15.2.3 -r1.15.2.4
--- openacs-4/packages/calendar-portlet/www/calendar-list-portlet.tcl	4 Feb 2017 13:19:55 -0000	1.15.2.3
+++ openacs-4/packages/calendar-portlet/www/calendar-list-portlet.tcl	13 Feb 2017 10:55:46 -0000	1.15.2.4
@@ -25,7 +25,7 @@
     {page_num:naturalnum ""}
     {date ""}
     {julian_date ""}
-    {period_days:integer,optional ""}
+    {period_days:naturalnum,optional ""}
     {sort_by ""}
 } -properties {