Considering that there is no NSTime in Cocoa-Touch (Objective-C on iPhone), and given two times as NSStrings and a timezone as an NSString, how can you calculate whether or
You should probably look at NSCalendar and NSDateComponents. I'm using them to do some date math for an iPhone app. I don't see a builtin method to do what you want directly, but you can figure it out by breaking it into pieces I expect?