You have some options. (This is US usage in case there are differences.) 1:02 - "one oh two" or "two minutes after one." 3:30 - "three thirty" or, much less common in the US, "half past three" 5:59 - "five fifty-nine" or " a minute before six" or "one minute before six"

Hi! 1:02 - two past one 3:30 - three thirty / half past three 5:59 - one to six