Changing Values

my script recives data which is in a time format such as HHH/MM/SS e.g 12:42:00 where the hours can be ulimited and seconds are always 00.

How can I change it into so that the data is only 12:42 instead of the 00 at the end?

Lastly how can I add up the two times such as 12:43 + 6:56 as the normall method you end up with 6:56?

Thanks for any help in advance.

Akbar

You could use strtotime, then use the date() function to format it.
date/time functions