[Home](./index.md) > [@firebase/auth](./auth.md) > [IdTokenResult](./auth.idtokenresult.md) > [authTime](./auth.idtokenresult.authtime.md) ## IdTokenResult.authTime property The authentication time formatted as a UTC string. Signature: ```typescript authTime: string; ``` ## Remarks This is the time the user authenticated (signed in) and not the time the token was refreshed.