diff --git a/src/dev/jest/junit_reporter.js b/src/dev/jest/junit_reporter.js
index 35b8a5a39608..65f244042a12 100644
--- a/src/dev/jest/junit_reporter.js
+++ b/src/dev/jest/junit_reporter.js
@@ -70,8 +70,9 @@ export default class JestJUnitReporter {
       { skipNullAttributes: true }
     );
 
-    const msToIso = (ms) => (ms ? new Date(ms).toISOString().slice(0, -5) : undefined);
-    const msToSec = (ms) => (ms ? (ms / 1000).toFixed(3) : undefined);
+    const isNumeric = (val) => !isNaN(parseFloat(val)) && isFinite(val);
+    const msToIso = (ms) => (isNumeric(ms) ? new Date(ms).toISOString().slice(0, -5) : undefined);
+    const msToSec = (ms) => (isNumeric(ms) ? (ms / 1000).toFixed(3) : undefined);
 
     root.att({
       name: 'jest',