iOS日期加减

- (NSDate *)jsDateFromBeginDate:(NSDate *)beginDate todays:(int)days
{
    NSDate *dateTemp = [[NSDate alloc]init];
    NSTimeInterval interval = 24*60*60*days;
    dateTemp = [dateTemp initWithTimeInterval:interval sinceDate:beginDate];

    return dateTemp;
}

　　

NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc]init]autorelease];

NSDate*nowDate = [NSDate date];
   NSTimeInterval  interval =24*60*60*1; //1:天数
    NSDate*date1 = [nowDate initWithTimeIntervalSinceNow:+interval];
   [dateFormattersetDateFormat:@"yyyy-MM-dd"];
   pLabDate.text  = [NSStringstringWithFormat:@"%@",[dateFormatter stringFromDate:date1]];