diff --git a/generate_calendar_dates.php b/generate_calendar_dates.php
index e0805d9..a43a6bf 100644
--- a/generate_calendar_dates.php
+++ b/generate_calendar_dates.php
@@ -6,9 +6,11 @@
 
 
 /*
-	Date of the Monday of the first academic week of the year. Teaching weeks start on Monday, so this is a convenient base point to start from. This will need to be updated annually.
+	Date of the Monday of the first academic week of the year (ISO 8601). Teaching weeks start on Monday, so this is a convenient base point to start from. Note that this is always for the *current* year!
 */
-$first_monday = new DateTime( "2018-12-31" );
+$first_monday = new DateTime();
+$first_monday->setISODate(date("Y"), 1);
+
 
 
 /*