[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [IdTokenResult](./auth-types.idtokenresult.md) > [expirationTime](./auth-types.idtokenresult.expirationtime.md) ## IdTokenResult.expirationTime property The ID token expiration time formatted as a UTC string. Signature: ```typescript expirationTime: string; ```