What I am searching for is a Cocoa (or third party) class that can display time intervals in natural language, e.g.:
Do you know anything that could help me to achieve this task without writing it by myself and melting in if-else hell?
The one I've originally pointed to does not seem to be there anymore but as pointed out there is NSDate-TimeAgo, I haven't tried it but looks good to me.
EDIT: updated answer to point to existing code
Your question for Cocoa is the same as this question for Cocoa Touch, and the answer to that one will work for you as well, because it uses Foundation, which is in both Cocoa and Cocoa Touch.
See -[NSDateFormatter setDoesRelativeDateFormatting:].
I can really recommend Mattt Thompson's TTTTimeIntervalFormatter - very clean, very functional (lots of other super useful bits and pieces in the same repo).
