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POTimeInterval calculation issue
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copied!<p>I am trying to create an app that calculates the time difference and the amount is multiplied by an amount in money. It is targeted to calculate in R$ (brazilian real) the amount that someone will have to pay for using a service during the time calculated by the app.</p> <p>Here´s is my code:</p> <pre><code>- (IBAction)encerrar:(id)sender { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; dateFormatter.dateFormat = @"HH:mm"; NSString *temp = inicio.text; NSDate *then = [dateFormatter dateFromString:temp]; NSDate *now = [NSDate date]; NSTimeInterval timeInterval = [now timeIntervalSinceDate:then]; NSString *ext = [dateFormatter stringFromDate:now]; fim.text = ext; NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval]; [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]]; NSString *timeString = [dateFormatter stringFromDate:timerDate]; duracao.text = timeString; double timeIntervalInHours = (timeInterval / 3600.0) * 5; NSString *vTotal = [[NSString alloc] initWithFormat:@"R$ %.2f", fecha]; NSLog(@"%.2f", timeIntervalInHours); vlrTotal.text = vTotal; } </code></pre> <p>The fact is that when we click on Calculate button, and if the duracao (duration) is equal to 1h it gives me the correct amount which is R$ 5,00. But when the duration is equal to 30mins or other value different from exact 1h, it gives the wrong amount.</p> <p>I.E.: 1h should be R$ 5,00; while 1:30h should be R$ 7,50, but shows me R$ 6,50.</p> <p>So, anyone could help me on this???</p> <p>Thanks in advance!!!</p>

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