Originally Posted by Bilbo1967
Personally, in everyday conversation, I would always say "twenty five to six" (or similar). 5:35 sounds a bit formal to my ear.
I had though "five thirty five" would seem less
In the States, I have heard "quarter of six" but it's rare and pretty much archaic now vs. five-forty-five.
Another one that's U. K. specific is "It's gone seven!" (U. S. = "It's after seven!")
If you're scheduling say a dentist apppointment, would you expect the receptionist to say, "On that date I have something open at twenty past six?" Here you'd likely get " ... I can do six twenty"