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I have always had a problem with adding and subtracting time like for an example:

   10h:34min 
 + 07h:46min
 -----------
    XX:XX
Anthony Forloney
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user333094
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    possible duplicate of http://stackoverflow.com/questions/2767068/adding-30-minutes-to-time-formatted-as-hi-in-php – Gordon May 05 '10 at 14:37
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    possible duplicate of http://stackoverflow.com/questions/2382458/subtracting-a-certain-number-of-hours-days-months-or-years-from-date – Gordon May 05 '10 at 14:38
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    possible duplicate of http://stackoverflow.com/questions/1370332/add-two-or-more-time-strings-in-php – Gordon May 05 '10 at 14:39
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    possible duplicate of http://stackoverflow.com/questions/1456886/adding-time-in-php – Gordon May 05 '10 at 14:39
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    Whoa, wait, this site has a search function? – zildjohn01 May 05 '10 at 14:44
  • Also, you might want to specifcy the XX:XX part. What is the addition supposed to return when the hour exceeds 23? Should it keep counting hours or add 1d to the output? What if subtracting would yield a negative number? – Gordon May 05 '10 at 14:52

1 Answers1

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Convert your time(s) to minutes, add them and re-calculate hours and minutes:

time in minutes ("tim"): (10 * 60 + 34) + (7 * 60 + 46)
result: floor(tim/60) : (tim%60)

floor(tim/60) will give you the whole hours
tim%60 is the "modulo" which is the integer "rest" of (tim/60)

If you work with whole dates (and times, not durations like it seems you do), try mktime and/ or strtotime which support operations like "+10 minutes" (and other).

Select0r
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