objective-c字符串转化成NSDate类型，计算与当前时间的相差，月数，天数

NSString *dateStr=[dic objectForKey:@"date"];// 2012-05-17 11:23:23
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
     NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;
    NSDateFormatter *format=[[NSDateFormatter alloc] init];
    [format setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *fromdate=[format dateFromString:dateStr];
    NSTimeZone *fromzone = [NSTimeZone systemTimeZone];
    NSInteger frominterval = [fromzone secondsFromGMTForDate: fromdate];
    NSDate *fromDate = [fromdate  dateByAddingTimeInterval: frominterval];
     NSLog(@"fromdate=%@",fromDate);
    [format release];
    NSDate *date = [NSDate date];
    NSTimeZone *zone = [NSTimeZone systemTimeZone];
    NSInteger interval = [zone secondsFromGMTForDate: date];
    NSDate *localeDate = [date  dateByAddingTimeInterval: interval];
    NSLog(@"enddate=%@",localeDate);
    NSDateComponents *components = [gregorian components:unitFlags fromDate:fromDate toDate:localeDate options:0];
    NSInteger months = [components month];
    NSInteger days = [components day];//年[components year]
    NSLog(@"month=%d",months);
    NSLog(@"days=%d",days);
    [gregorian release];
    if (months==0&&days;==0) {
        dateStr=[[dateStr substringFromIndex:11]substringToIndex:5];
        cell.textLabel.text=[NSString stringWithFormat:@"今天 %@",dateStr];//今天 11:23
    }else if(months==0&&days;==1){
        dateStr=[[dateStr substringFromIndex:11]substringToIndex:5];
        cell.textLabel.text=[NSString stringWithFormat:@"昨天 %@",dateStr];//昨天 11:23
    }else{
        dateStr=[dateStr substringToIndex:10];
        cell.textLabel.text=dateStr;
    }

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