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    <p><code>timeInterval</code> is the amount of time in seconds, so if you want it in hours and fractions of an hour just do this:</p> <pre><code>double timeIntervalInHours = timeInterval / 3600.0; </code></pre> <p>and then multiple <code>timeIntervalInHours</code> times the price/hour to get the cost.</p> <p><strong>EDIT</strong><br> Based on our chat, I would create a button with "iniciar" (start) as the title. When they press that button, I would store the current time and change the title to "encerrar" (stop). (I hope that my translations are correct, lol) Then the button action would look something like this:</p> <pre><code>// self.startTime is a NSDate. - (IBAction)iniciar_encerrar:(UIButton *)sender { if ([sender.titleLabel.text isEqualToString:@"iniciar"]) { // We are starting the time if (self.startTime != nil) { return; } self.startTime = [NSDate date]; [sender setTitle:@"encerrar" forState:UIControlStateNormal]; } else { // We are stopping the time NSDate *currentTime = [NSDate date]; NSTimeInterval elapsedTimeInSeconds = [currentTime timeIntervalSinceDate:self.startTime]; double cost = elapsedTimeInSeconds / 3600.0 * 5.0; NSLog(@"%.2lf", cost); // reset the button self.startTime = nil; [sender setTitle:@"iniciar" forState:UIControlStateNormal]; } } </code></pre> <p><strong>startTime is declared as follows:</strong> </p> <p>In your .h file, along with the other declared properties, add:</p> <pre><code>@property (strong, nonatomic) NSDate *startTime; </code></pre> <p>In your .m file, add this at the top with the other ones:</p> <pre><code>@synthesize startTime; </code></pre> <p>In your <code>viewDidUnload</code> function (in your .m file) add this:</p> <pre><code>startTime = nil; </code></pre> <p>This just gives you a place to store the startTime date.</p>
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    1. COThis didn´t work. But thank you.
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    2. COIt really should. What result did you get?
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    3. COI did this: double timeIntervalInHours = (timeInterval / 3600.0) * 5; but i get this 'R$ 1851965.02' for calculating a one hour duration and it should be R$ 5.00
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