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    <p>There are many thing wrong with this code:</p> <p>Why create all these object:</p> <pre><code>NSString *modiDate = [NSString stringWithFormat:@"1338229800"]; //example time interval value NSNumber *time = [NSNumber numberWithDouble:([modiDate doubleValue] - 3600)]; NSTimeInterval interval = [time doubleValue]; </code></pre> <p>When this is the same:</p> <pre><code> NSString *modiDate = [NSString stringWithFormat:@"1338229800"]; NSTimeInterval interval = [modiDate doubleValue] - 3600; </code></pre> <hr> <p>Here you assing a new date to online:</p> <pre><code>NSDate *online = [NSDate date]; </code></pre> <p>only to set an other date to online here:</p> <pre><code>online = [NSDate dateWithTimeIntervalSince1970:interval]; </code></pre> <p>You should have done this: </p> <pre><code>NSDate *online = [NSDate dateWithTimeIntervalSince1970:interval]; </code></pre> <hr> <p>I'm sure what you problem with this code, but it works correctly. You might want to set the locale, not really need but might have some effect in localization:</p> <pre><code>NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; dateFormatter.locale = [NSLocale systemLocale]; [dateFormatter setDateFormat:@"MM/dd/yyyy HH:mm:ss aaa"]; NSLog(@"result: %@", [dateFormatter stringFromDate:online]); </code></pre> <hr> <p><strong>Added new code from edit</strong></p> <p>In your edit you added this code:</p> <pre><code>NSDate *dateFromString1 = [[NSDate alloc] init]; dateFromString1 = [format dateFromString:modDate]; </code></pre> <p>Here you are leaking an <code>NSDate</code> object,just do this:</p> <pre><code>NSDate *dateFromString1 = [format dateFromString:modDate]; </code></pre> <p>And as state in the answer by <a href="https://stackoverflow.com/users/127493/martin">martin</a> the problem is in the time format string.</p>
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