diff --git a/schedule/ics.php b/schedule/ics.php
index cef6c00..e5d5ff4 100644
--- a/schedule/ics.php
+++ b/schedule/ics.php
@@ -28,7 +28,7 @@ echo "DTSTAMP:".ics_formatdate("now").ICS_EOL;
 $event_ids = array();
 
 foreach ($schedule as $event) {
-	$id = strval($event["id"]).gmdate("DHis").gmdate("DHis");
+	$id = strval($event["id"]).gmdate("DHis",strtotime($event["start"])).gmdate("DHis",strtotime($event["end"]));
 	if (!in_array($id,$event_ids)){
 		array_push($event_ids,$id);
 		// The VEVENT structure's pretty easy to generate, especially since we're already in UTC.