It's four o'clock
it's five past four
it's seven past four
it's ten past four
it's twelve past four
it's quarter past four
it's twenty past four
it's twenty-five past four
it's twenty-eight past four - it's about/nearly half past four
it's half past four
it's twenty-five to five
it's about/nearly twenty to five - it's twenty-one to five
it's twenty to five
it's nearly/about quarter to five - it's sixteen to five
it's ten to five
it's seven to five
it's five to five
it's five o'clock