Get day difference b/w two dates

- (int) daysToDate:(NSDate*) endDate
{
    //dates needed to be reset to represent only yyyy-mm-dd to get correct number of days between two days.
    NSDateFormatter *temp = [[NSDateFormatter alloc] init];
    [temp setDateFormat:@"yyyy-MM-dd"];
    NSDate *stDt = [temp dateFromString:[temp stringFromDate:[NSDate date]]];
    NSDate *endDt =  [temp dateFromString:[temp stringFromDate:endDate]];
    [temp release];
    unsigned int unitFlags = NSDayCalendarUnit;
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *comps = [gregorian components:unitFlags fromDate:endDt  toDate:stDt options:0];
    int days = [comps day];
   
   
    [gregorian release];
    return days;
}



Call the function:

   NSString *str =[NSString stringWithFormat:@"%@ 00:00:00",[strdate substringToIndex:10]];
   NSDateFormatter *df = [[NSDateFormatter alloc] init];
   [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
   NSDate *dd = [df dateFromString:str];
   int d = [self daysToDate:dd];

Note: PASS date in yyyy-MM-dd HH:mm:ss formate
where date time should be 00:00:00
so date should be as 2010-12-02 00:00:00


thanks