¿Qué hora es?

What time is it?

Es la una.

It's one o/clock.

Son las dos.

It's two o'clock.

Son las tres.

It's three o'clock.

Es mediodía.

It's noon.

Es medianoche.

It's midnight.

Es la una y media.

It's 1:30

Son las dos y media.

It's 2:30.

Son las tres y media.

It's 3:30.