Here are some possibilities depending on what follows "y":
* "Las nueve y cuarto" - Nine fifteen
* "Las nueve y media" - Nine thirty
* "Las nueve y diez" - Nine ten
* "Las nueve y cuarto de la tarde" - Nine fifteen in the evening (or PM)
* "Las nueve y media de la mañana" - Nine thirty in the morning (or AM)
To get a proper translation, you need to know what comes after "y".