Time formatted string from seconds.

time-nsstring.m

/**
 * Returns the human-readable string that represents the specified seconds.
 * @discussion Ex: seconds = 4017 -> "01:06:57"
 */
- (NSString *)timeStringFromSeconds:(NSInteger)seconds
{
    int hours = seconds / 3600;
    int rem = seconds % 3600;
    int minutes = rem / 60;
    int remSecs = rem % 60;
    
    return [NSString stringWithFormat:@"%.2d:%.2d:%.2d", hours, minutes, remSecs];
}