"¿A qué hora es...?" is used to express "at what time an event takes place". This is different than telling the time as it refers to a single event and the verb "ser" will be conjugated in the third-p..."¿A qué hora es...?" is used to express "at what time an event takes place". This is different than telling the time as it refers to a single event and the verb "ser" will be conjugated in the third-person-singular-form: "¿A qué hora es la clase de español?" "¿A qué hora es la fiesta?" To answer the question or to express "at what time an event is", use: "es + a + la/las + hour": "La clase de español es a la una de la tarde."
