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How do I find the time interval between two date attributes in an Entity in a Cocoa Application using Core Data?

I have a date attribute "off" which is represented with Date Formatter in a tableView as HH:MM. I have a date attribute "on" that is also represented with a Date Formatter in a TableView. I'm trying to output the time interval (HH:MM)between these two attributes. The output would be flight time.

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