Index: openacs-4/packages/acs-datetime/www/doc/examples/calendar-navigation.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-datetime/www/doc/examples/calendar-navigation.tcl,v
diff -u -N -r1.4.2.1 -r1.4.2.2
--- openacs-4/packages/acs-datetime/www/doc/examples/calendar-navigation.tcl	10 Sep 2015 08:21:22 -0000	1.4.2.1
+++ openacs-4/packages/acs-datetime/www/doc/examples/calendar-navigation.tcl	17 May 2016 19:23:16 -0000	1.4.2.2
@@ -13,6 +13,15 @@
 } -properties {
     title:onevalue
     calendar_widget:onevalue
+} -validate {
+    date_valid -requires date {
+        #
+        # Check for the date formats accepted by lc_time_fmt
+        #
+        if {[catch {lc_time_fmt $date %B} errorMsg]} {
+            ad_complain "Invalid date"
+        }
+    }
 }
 
 set title "Calendar Navigation"
@@ -23,7 +32,6 @@
 ad_return_template
 
 
-
 # Local variables:
 #    mode: tcl
 #    tcl-indent-level: 4