[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [IdTokenResult](./auth-types.idtokenresult.md) > [authTime](./auth-types.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.