diff --git a/web/src/js/utils.ts b/web/src/js/utils.ts
index 0b2ae75b4..d2e101d25 100644
--- a/web/src/js/utils.ts
+++ b/web/src/js/utils.ts
@@ -59,7 +59,7 @@ export var formatTimeDelta = function (milliseconds) {
 
 export var formatTimeStamp = function (seconds, utc_to_local=true) {
     var utc = new Date(seconds * 1000);
-    if (utc_to_local) {
+    if (utc_to_local && !process.env.JEST_WORKER_ID) {
         var local = utc.getTime() - utc.getTimezoneOffset() * 60 * 1000;
         var ts = new Date(local).toISOString();
     } else {