GetDurationString

// Get string time duration from 2 different NSDate object

- (NSString *)getNaturalLanguageForDate:(NSDate *)date1 andDate:(NSDate *)date2 withCalendar:(NSCalendar *)sysCalendar
{
    // Get conversion to months, days, hours, minutes
    unsigned int unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
    
    NSDateComponents *breakdownInfo = [sysCalendar components:unitFlags fromDate:date1  toDate:date2  options:0];
    
    NSString *duration = [NSString stringWithFormat:@"%@:%@", [breakdownInfo hour], [breakdownInfo minute]];
    return duration;
}