diff --git a/calendar/generate_calendar.php b/calendar/generate_calendar.php
index e3a16c7..c88f6a2 100644
--- a/calendar/generate_calendar.php
+++ b/calendar/generate_calendar.php
@@ -39,10 +39,6 @@
 
     Example:
     
-    $year = 2013;
-    
-    $first_monday = new DateTime( "2012-12-31" );
-    
     $periods = array(
         'SummerSchool' => array(
             'first_week'  => 2,
@@ -97,6 +93,11 @@
 require 'calendar_config.php';
 
 
+// Get first Monday of week 1 according to ISO 8601.
+$year = date("Y");
+$first_monday = new DateTime();
+$first_monday->setISODate($year, 1);
+
 // A couple of handy date intervals: four days to the end of the current week,
 // and seven days to the start of next week.
 $plus_four_days = new DateInterval( 'P4D' );