note 58801 rejected from function.mktime by cece

Note Submitter: Rick ---- Hi: I have a page with a input(text) where the user put a time like (00:00) in the format of 24hrs. I want to validate that the time format is correct... i think i could use the mktime() to check, i think that if a user puts something like 33:99 hrs. thes mktime will return -1, but thats not the way it works....its seems that the mktime calculates 24:59 hrs plus 09:40 could some one give me a clue how to validate this... I hope some one understand my problem, i am not good with mi english.. :S