diff --git a/api/src/Repositories/WorkingHoursWeeklyViewRepository.php b/api/src/Repositories/WorkingHoursWeeklyViewRepository.php
index 05fec39..d1043e1 100644
--- a/api/src/Repositories/WorkingHoursWeeklyViewRepository.php
+++ b/api/src/Repositories/WorkingHoursWeeklyViewRepository.php
@@ -34,8 +34,9 @@ SQL;
     {
         $time_array = explode('#', $period);
         $year = (int)$time_array[0];
-        $week = (int)$time_array[1];
-        $date = new DateTime($year. '-01-01');
+        $week = (int)$time_array[1] - 1;
+        $date = new DateTime('first day of January ' . $year);
+        $date->modify('monday this week');
         $date->add(new DateInterval(sprintf('P%dW', $week)));
         return $date;
     }