-(NSString *)getCurrentTime

{

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSString *dateTime = [formatter stringFromDate:[NSDate date]];

    self.startTime = dateTime;

    return startTime;

}

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *date1 = [formatter dateFromString:startTime];

NSDate *date2 = [NSDate date];

NSTimeInterval aTimer = [date2 timeIntervalSinceDate:date1];

 

int hour = (int)(aTimer/3600);

int minute = (int)(aTimer - hour*3600)/60;

int second = aTimer - hour*3600 - minute*60;

NSString *dural = [NSString stringWithFormat:@"%d時(shí)%d分%d秒", hour, minute,second];

minutes = floor(326.4/60)
seconds = round(326.4 - minutes * 60)

// The time interval 
NSTimeInterval theTimeInterval = 326.4;
// Get the system calendar
NSCalendar *sysCalendar = [NSCalendar currentCalendar];
// Create the NSDates
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] initWithTimeInterval:theTimeInterval sinceDate:date1]; 
// Get conversion to months, days, hours, minutes
unsigned int unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
NSDateComponents *conversionInfo = [sysCalendar components:unitFlags fromDate:date1 toDate:date2 options:0];
NSLog(@"Conversion: %dmin %dhours %ddays %dmoths",[conversionInfo minute], [conversionInfo hour], [conversionInfo day], [conversionInfo month]);
[date1 release];
[date2 release];

double progress;
int minutes = floor(progress/60);
int seconds = trunc(progress - minutes * 60);

- (NSString*)formattedStringForDuration:(NSTimeInterval)duration
{
 NSInteger minutes = floor(duration/60);
 NSInteger seconds = round(duration - minutes * 60);
 return [NSString stringWithFormat:@"%d:%02d", minutes, seconds];
}

NSTimeInterval timeInterval = 326.4;
long seconds = lroundf(timeInterval); // Modulo (%) operator below needs int or long
int hour = seconds / 3600
int mins = (seconds % 3600) / 60;
int secs = seconds % 60;