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    <p>With only <code>NSString</code>, <a href="https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html" rel="nofollow">NSDateFormatter</a> is used to get <a href="https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html" rel="nofollow">NSDate</a></p> <pre><code>NSDateFormatter *rfc3339DateFormatter = [[NSDateFormatter alloc] init]; NSLocale *enUSPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]; [rfc3339DateFormatter setLocale:enUSPOSIXLocale]; [rfc3339DateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"]; [rfc3339DateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; // Convert the RFC 3339 date time string to an NSDate. NSDate *date = [rfc3339DateFormatter dateFromString:rfc3339DateTimeString]; </code></pre> <p>If you had separate values for hours, minutes and seconds you could use <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSCalendar_Class/Reference/NSCalendar.html" rel="nofollow">NSCalendar</a></p> <pre><code>NSDateComponents *comps = [[NSDateComponents alloc] init]; [comps setYear:1965]; [comps setMonth:1]; [comps setDay:6]; [comps setHour:14]; [comps setMinute:10]; [comps setSecond:0]; NSDate *date = [gregorian dateFromComponents:comps]; [comps release]; </code></pre> <p>And a perfect solution would be to use timestamps instead of NSString. Not only it's easy to convert timestamps to <code>NSDate</code> (<code>NSDate +dateWithTimeIntervalSinceReferenceDate</code>)and then to <code>NSString</code> when needed, but you can also get the time difference by subtraction.</p> <p>And with two <code>NSDate</code> objects the time difference is calculated with <code>NSDate -timeIntervalSinceDate</code>.</p>
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    1. POGet the difference time between two NSString in Objective C
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    1. COThis answer does not address the actual problem in the question.
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    2. CO@rmaddy It's not copy&paste solution which I'm not going to give for this level of the question anyway. And yes it does, both for the question before and after edit.
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