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How to Get time difference in iPhone

I´m getting date and time from a JSON feed. I need to find the difference between the date I´m getting from the feed and today´s date and time. Any suggestions how I can do this?

I know I need to subtract the current date with the date I get from the feed, but I don´t know how to do it.

Ex:

Date from feed: Date: 2011-06-10 15:00:00 +0000 Today: Date: 2011-06-10 14:50:00 +0000

I need to display that the difference is ten minutes.

Thanks!

iphone xcode json nsdate nstimeinterval
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