日期判断是今天／明天／后天

/**
 *  获取时间是今天，明天还是后天
 *
 *  @param time 待转换的时间
 *
 *  @return 今天，明天，后天
 */

- (NSString*)getDays:(NSDate*)timeDate{

   

   NSDate*toDate = [NSDatedate];
    NSCalendar *calender = [[NSCalendaralloc]initWithCalendarIdentifier:NSChineseCalendar];
    NSDateComponents *comps_today = [calendercomponents:(NSYearCalendarUnit| NSMonthCalendarUnit |NSDayCalendarUnit)fromDate:toDate];
    NSDateComponents *comps_other = [calendercomponents:(NSYearCalendarUnit| NSMonthCalendarUnit |NSDayCalendarUnit)fromDate:timeDate];
   
    if (comps_today.year== comps_other.year&&
        comps_today.month== comps_other.month&&
        comps_today.day== comps_other.day) {
        return @"今天";
    }elseif(comps_today.year== comps_other.year&&
              comps_today.month== comps_other.month&&
              (comps_today.day- comps_other.day) == -1){
        return @"明天";
    }elseif(comps_today.year== comps_other.year&&
              comps_today.month== comps_other.month&&
              (comps_today.day- comps_other.day) == -2){
       
        return @"后天";
    }
   
    return @"";

}