Timerecording Bugfix Monatsauswertungsberechnung fürs Input

* Hab das robuster umgeschrieben damit der strtotime Bug nicht wieder geltend wird wenn es der 31te des Monats ist

Layout/default/Timerecording/Index.php

@@ -22,12 +22,20 @@ for ($i = 1; $i <= 25; $i++) {
     $time = $time - 604800;
 }
 
-$time = time();
+$monthger = [
+    1 => 'Januar', 2 => 'Februar', 3 => 'März', 4 => 'April',
+    5 => 'Mai', 6 => 'Juni', 7 => 'Juli', 8 => 'August',
+    9 => 'September', 10 => 'Oktober', 11 => 'November', 12 => 'Dezember'
+];
+
+$month = [];
+$date = new DateTime('first day of this month');
+
 for ($i = 1; $i <= 12; $i++) {
-    $mon = date('n', $time);
-    $year = date('Y', $time);
-    $month[$time] = $monthger[$mon] . " " . $year;
-    $time = strtotime('-1 month', $time);
+    $mon = $date->format('n');
+    $year = $date->format('Y');
+    $month[$date->getTimestamp()] = $monthger[$mon] . " " . $year;
+    $date->modify('-1 month');
 }
 
 $years[time() + 31536000] = date('Y', time() + 31536000);