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Does anyone know of a time calculator for OSX?

I'm looking for a calculator that allows me to do this kind of math with times

- 00:15:00
+ 02:30:00
= 03:30:58

Ofcourse the actualy calculations i'm looking to do are a little more complex and involve alot more data but basically adding and substracing is all it should do.

share|improve this question
It's supposed to be 03:30:58 at the end, right? – Daniel Beck Nov 30 '10 at 11:30
Depending on your use case, you might have success with time tracking software like "On The Job" or "Billings" – Daniel Beck Nov 30 '10 at 11:31
+1 @Daniel yes ... thanks for pointing that out, i've been staring at these kinds of numbers all day long and missed that one, hence i'm searching for a calculator easing the job :p – ChrisR Nov 30 '10 at 16:02
up vote 2 down vote accepted

Hardly a native app, but spreadsheets like Calc and Microsoft Excel might help? Just remember that the default time formats such as HH:MM:SS will show 26 hours as 02:00:00, and minus 2 hours as 22:00:00 or 10:00:00 PM. To avoid that:

Use square brackets in the format, for both the inputs and the results:[HH]:MM:SS. Then all you need is the SUM(..) function:

SUM and the correct time format in

In localized versions of you might need odd formats like [UU]:MM:SS

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That works wonderfully well, thanks alot arjan! – ChrisR Dec 1 '10 at 13:26
A, Chris, only now I see your comment, as I needed the [MM] myself and forgot its format. More important: I've thanked the alot. ;-) – Arjan Apr 8 '12 at 10:15

Could this site be of any use to you?

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Yes, i found that prior to asking this question but alas it's usability is poor and it's webbased, if possible i'd rather use a native app if there is one. – ChrisR Nov 30 '10 at 16:00
@Chris, it does allow for downloading too. That would still need a browser though. In Google Chrome on Windows you could save this as an application, but on my Mac menu File » Create Application Shortcut is disabled. Still, Fluid could help. Likewise, Mozilla Prism could achieve the same for Firefox. – Arjan Dec 1 '10 at 13:14

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