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    <p><strong>First tap,</strong></p> <pre><code>NSDate *date = [NSDate date]; NSTimeInterval ti = [date timeIntervalSince1970]; </code></pre> <p>Get UNIX time stamp,</p> <p><strong>Second tap,</strong></p> <pre><code>NSDate *date = [NSDate date]; NSTimeInterval ti = [date timeIntervalSince1970]; </code></pre> <p>Get another UNIX time stamp, then subtract first from second time stamp. The product of subtraction becomes your progress.</p> <p>then use this code to get the hour:minute:second</p> <pre><code>double progress; int minutes = floor(progress/60); int seconds = trunc(progress - minutes * 60); </code></pre> <p>Code courtesy : <a href="https://stackoverflow.com/questions/1189252/how-to-convert-an-nstimeinterval-seconds-into-minutes">How to convert an NSTimeInterval (seconds) into minutes</a></p> <h2>Easier</h2> <p>Get two NSDate from two taps and then use, Then no subtraction needed, just use below method to get time interval. and then calculate minutes and second as shown above.</p> <pre><code>- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)anotherDate </code></pre> <hr /> <p><strong>Alternatively</strong></p> <p>Use <code>components:fromDate:toDate:options:</code> method from <code>NSCalender</code> class. See : <a href="http://developer.apple.com/library/mac/#documentation/cocoa/reference/foundation/Classes/NSCalendar_Class/Reference/NSCalendar.html" rel="nofollow noreferrer">Apple Doc</a>.</p> <h1>Edit :</h1> <p>Jus did a quick test, and it worked perfectly for me.</p> <h2>Test Code :</h2> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. NSDate *date = [NSDate date]; NSTimeInterval ti = [date timeIntervalSince1970]; NSLog(@"%f",ti); return YES; } </code></pre> <h3>NSLog Output :</h3> <pre><code>2012-08-22 10:46:09.123 Test[778:c07] 1345596369.123665 </code></pre>
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    1. COThanks, I will give it a try.
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    2. CO@user1607767, It worked for me. What is the error?
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    3. COBuild failed. @NSTimeinterval ti = [date timeIntervalSince1970];
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