diff --git a/apps/umpire/app.js b/apps/umpire/app.js
index ab27406d0..3c139c2ea 100644
--- a/apps/umpire/app.js
+++ b/apps/umpire/app.js
@@ -68,7 +68,7 @@ function showLog() {
 }
 
 function formatDuration(timeDate) { 
-  return (timeDate.getHours()-timezoneOffsetHours) + ":" + timeDate.getMinutes().toString().padStart(2, "0") + ":" + timeDate.getSeconds().toString().padStart(2, "0") + "";
+  return (timeDate.getHours() + timezoneOffsetHours) + ":" + timeDate.getMinutes().toString().padStart(2, "0") + ":" + timeDate.getSeconds().toString().padStart(2, "0") + "";
 }
 
 function formatTimeOfDay(timeSig) {