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    <p>In the interest of completeness, based on a @Gilean's answer, here's the complete code for a simple category on NSDate that mimics rails' nifty date helpers. For a refresher on categories, these are instance methods that you would call on NSDate objects. So, if I have an NSDate that represents yesterday, [myDate distanceOfTimeInWordsToNow] => "1 day".</p> <p>Hope it's useful!</p> <pre><code>@interface NSDate (NSDate_Relativity) -(NSString *)distanceOfTimeInWordsSinceDate:(NSDate *)aDate; -(NSString *)distanceOfTimeInWordsToNow; @end @implementation NSDate (NSDate_Relativity) -(NSString *)distanceOfTimeInWordsToNow { return [self distanceOfTimeInWordsSinceDate:[NSDate date]]; } -(NSString *)distanceOfTimeInWordsSinceDate:(NSDate *)aDate { double interval = [self timeIntervalSinceDate:aDate]; NSString *timeUnit; int timeValue; if (interval &lt; 0) { interval = interval * -1; } if (interval&lt; 60) { return @"seconds"; } else if (interval&lt; 3600) { // minutes timeValue = round(interval / 60); if (timeValue == 1) { timeUnit = @"minute"; } else { timeUnit = @"minutes"; } } else if (interval&lt; 86400) { timeValue = round(interval / 60 / 60); if (timeValue == 1) { timeUnit = @"hour"; } else { timeUnit = @"hours"; } } else if (interval&lt; 2629743) { int days = round(interval / 60 / 60 / 24); if (days &lt; 7) { timeValue = days; if (timeValue == 1) { timeUnit = @"day"; } else { timeUnit = @"days"; } } else if (days &lt; 30) { int weeks = days / 7; timeValue = weeks; if (timeValue == 1) { timeUnit = @"week"; } else { timeUnit = @"weeks"; } } else if (days &lt; 365) { int months = days / 30; timeValue = months; if (timeValue == 1) { timeUnit = @"month"; } else { timeUnit = @"months"; } } else if (days &lt; 30000) { // this is roughly 82 years. After that, we'll say 'forever' int years = days / 365; timeValue = years; if (timeValue == 1) { timeUnit = @"year"; } else { timeUnit = @"years"; } } else { return @"forever ago"; } } return [NSString stringWithFormat:@"%d %@", timeValue, timeUnit]; } @end </code></pre>
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    1. POiPhone: Convert date string to a relative time stamp
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    1. COOh, also: I left off 'ago' in this implementation to make it more useful. So you could call this and say @"it's been %@ since your last confession.", [confessionDate distanceOfTimeInWordsToNow]
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