diff --git a/types/gtag.js/gtag.js-tests.ts b/types/gtag.js/gtag.js-tests.ts
index c25db26c5f..1711b53eab 100644
--- a/types/gtag.js/gtag.js-tests.ts
+++ b/types/gtag.js/gtag.js-tests.ts
@@ -6,6 +6,7 @@ gtag('event', 'login', {
 });
 
 gtag('set', {currency: 'USD'});
+gtag('js', new Date());
 gtag('set', {
   country: 'US',
   currency: 'USD'
diff --git a/types/gtag.js/index.d.ts b/types/gtag.js/index.d.ts
index e20cc9d4fa..680fa9057b 100644
--- a/types/gtag.js/index.d.ts
+++ b/types/gtag.js/index.d.ts
@@ -8,6 +8,7 @@ declare namespace Gtag {
   interface Gtag {
     (command: 'config', targetId: string, config?: ControlParams | EventParams | CustomParams): void;
     (command: 'set', config: CustomParams): void;
+    (command: 'js', config: Date): void;
     (command: 'event', eventName: EventNames | string, eventParams?: ControlParams |  EventParams | CustomParams): void;
   }