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copied!<p>If you subtract 12/12/2001 from 05/05/2002 what will be the date? The chronological distance between two dates can't be a date, it's alway some kind of interval. You can use <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html" rel="nofollow noreferrer">timeIntervalSinceDate:</a> to calculate the interval.</p> <p>To localize you can try the following steps:</p> <ul> <li><p>You can use the <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSCalendar_Class/Reference/NSCalendar.html" rel="nofollow noreferrer">NSCalendar</a> with dateFromComponents: passing in a <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDateComponents_Class/Reference/Reference.html" rel="nofollow noreferrer">NSDateComponents</a>. </p></li> <li><p>To break down a timeInterval into <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDateComponents_Class/Reference/Reference.html" rel="nofollow noreferrer">NSDateComponents</a> look at <a href="https://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-and">How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone?</a>.</p></li> <li><p>Finally use the <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html" rel="nofollow noreferrer">NSDateFormatter</a> and <a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html#//apple_ref/doc/uid/20000447-BCIGICCF" rel="nofollow noreferrer">initWithDateFormat:allowNaturalLanguage:</a> to get your localized string. The <a href="http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/DataFormatting/Articles/df100103.html#//apple_ref/doc/uid/TP40007972-SW9" rel="nofollow noreferrer">Date Format String Syntax</a> shows the different placeholders. </p></li> </ul>

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