Index: openacs-4/packages/acs-datetime/tcl/acs-calendar-2-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-datetime/tcl/acs-calendar-2-procs.tcl,v
diff -u -N -r1.42 -r1.42.6.1
--- openacs-4/packages/acs-datetime/tcl/acs-calendar-2-procs.tcl	9 Nov 2008 23:29:22 -0000	1.42
+++ openacs-4/packages/acs-datetime/tcl/acs-calendar-2-procs.tcl	5 Sep 2013 11:50:59 -0000	1.42.6.1
@@ -485,7 +485,7 @@
 
         set old_item_type $item_type
 
-        if {[expr $flip % 2] == 0} {
+        if {$flip % 2 == 0} {
             set z_class odd
         } else {
             set z_class even