diff --git a/sites/all/modules/ubercart/uc_reports/uc_reports.module b/sites/all/modules/ubercart/uc_reports/uc_reports.module
index ed73e3a..3f4546a 100755
--- a/sites/all/modules/ubercart/uc_reports/uc_reports.module
+++ b/sites/all/modules/ubercart/uc_reports/uc_reports.module
@@ -390,5 +390,7 @@ function _uc_reports_end_interval($time, $interval = 'month') {
     $time = time();
   }
 
-  return strtotime('+1 '. $interval, $time) - 1;
+  $date = DateTime::createFromFormat('U', $time);
+  $date->modify('+1 ' . $interval . ' -1 second');
+  return $date->format('U');
 }