diff --git a/reports/weekheatmap/classes/query_helper.php b/reports/weekheatmap/classes/query_helper.php
index 7d604489d08fce680cbd35eae1b50035c5d44563..16d48bbf1b301f8433e7524142f7bddac556d505 100644
--- a/reports/weekheatmap/classes/query_helper.php
+++ b/reports/weekheatmap/classes/query_helper.php
@@ -43,7 +43,7 @@ class query_helper {
         $mondaytimestamp = $startdate->getTimestamp();
         $year = date("Y");
         $summertimestart = false; //bool if you are in summertime
-        $changedate = strtotime("last Sunday",mktime(0,0,0,4,1,$year+1))+7200;
+        $changedate = strtotime("last Sunday",mktime(0,0,0,4,1,$year+1))+7200; //timestamp of the next Daylight saving date
         if ((strtotime("last Sunday",mktime(0,0,0,4,1,$year))+7200) < $mondaytimestamp) {
             if ((strtotime("last Sunday",mktime(0,0,0,11,1,$year))+14400) > $mondaytimestamp) {
                 $summertimestart = true;
@@ -52,9 +52,6 @@ class query_helper {
         } else {
             $changedate = strtotime("last Sunday",mktime(0,0,0,4,1,$year))+7200;
         }
-        // TODO Implement Daylight saving offeset
-        // This does not work very well if daylight saving comes into play, then all old
-        // dates will be shifted by 1 hour...
 
         // returns points between 0 - 167 (24*7 data points), where 0 => Mon,0-1am; 1 => Mon,1-2am; ...
         $query = <<<SQL