IOS How to caculate day between two dates

/* Caculate day between two dates */
- (int)daysBetweenDates:(NSString*)dt1 toDate:(NSString *)dt2 {
    int numDays;
   
    NSDateFormatter *f1 = [[NSDateFormatter alloc] init];
    [f1 setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
    [f1 setDateFormat:@"yyyy-MM-dd"];
    NSDate *from = [f1 dateFromString:dt1];
    NSDateFormatter *f2 = [[NSDateFormatter alloc] init];
    [f2 setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
    [f2 setDateFormat:@"yyyy-MM-dd"];
    NSDate *to = [f2 dateFromString:dt2];

    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSUInteger unitFlags = NSDayCalendarUnit;
    NSDateComponents *components = [gregorian components:unitFlags fromDate:from toDate:to options:0];
    numDays = [components day];
    [gregorian release];
    [f1 release];
    [f2 release];
   
    return numDays + 1;
}

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