diff --git a/calendar/generate_calendar.php b/calendar/generate_calendar.php
index 5329b14..ac2e85a 100755
--- a/calendar/generate_calendar.php
+++ b/calendar/generate_calendar.php
@@ -40,7 +40,7 @@
 					first Monday of the year is stored in $first_monday below
 					(everything is Monday-indexed).
 */
-$first_monday = new DateTime( "2012-01-02" );
+$first_monday = new DateTime( "2012-12-31" );
 
 $periods = array(
 	'SummerSchool' => array(