diff --git a/packages/node_modules/@node-red/runtime/lib/api/diagnostics.js b/packages/node_modules/@node-red/runtime/lib/api/diagnostics.js
index f8ab9bbaf..9dc5a2dc0 100644
--- a/packages/node_modules/@node-red/runtime/lib/api/diagnostics.js
+++ b/packages/node_modules/@node-red/runtime/lib/api/diagnostics.js
@@ -78,7 +78,7 @@ function buildDiagnosticReport(scope, callback) {
         wsl: isInWsl(),
         time: {
             timestamp: now.valueOf(),
-            utc: "" + now,
+            utc: "" + now.toUTCString(),
             locale: now.toLocaleString(),
         },
         intl: Intl.DateTimeFormat().resolvedOptions(),