diff --git a/apps/schoolCalendar/custom.html b/apps/schoolCalendar/custom.html
index d2c1c806a..0141bf067 100644
--- a/apps/schoolCalendar/custom.html
+++ b/apps/schoolCalendar/custom.html
@@ -84,7 +84,7 @@
             for(i=0;i<calendarEvents.length;i++){
               var calendarEntry = {}
               calendarEntry['cn'] = calendarEvents[i].title;
-              calendarEntry['dow'] = calendarEvents[i].start.getDate();
+              calendarEntry['dow'] = calendarEvents[i].start.getDate()-3;
               calendarEntry['sh'] = calendarEvents[i].start.getHours();
               calendarEntry['sm'] = calendarEvents[i].start.getMinutes();
               calendarEntry['eh'] = calendarEvents[i].end.getHours();