- (NSString *)preettyTime:(long long)ts
{
    //原有时间
    NSString *firstDateStr=[self FormatTime:@"yyyy-MM-dd" timeInterval:ts];
    NSArray *firstDateStrArr=[firstDateStr componentsSeparatedByString:@"-"];
    
    //现在时间
    NSDate *now = [NSDate date];
    NSDateComponents *componentsNow = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:now];
    NSString *nowDateStr = [NSString stringWithFormat:@"%ld-%ld-%ld", (long)[componentsNow year], (long)[componentsNow month], (long)[componentsNow day]];
    NSArray *nowDateStrArr = [nowDateStr componentsSeparatedByString:@"-"];
    
    
    NSDate *date = [NSDate dateWithTimeIntervalSince1970:ts/1000];
    NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
    
    //同年
    if ([firstDateStrArr[0] intValue] == [nowDateStrArr[0] intValue]){
        
        //当天
        if( [firstDateStrArr[1] intValue] == [nowDateStrArr[1] intValue] && [nowDateStrArr[2] intValue]== [firstDateStrArr[2] intValue]){
            [dateformatter setDateFormat:@"HH:mm"];
            return [NSString stringWithFormat:@"%@", [dateformatter stringFromDate:date]];
        }
        
        //昨天
        if( [firstDateStrArr[1] intValue]==[nowDateStrArr[1] intValue] && ([nowDateStrArr[2] intValue]-[firstDateStrArr[2] intValue]==1)){
            [dateformatter setDateFormat:@"HH:mm"];
            return [NSString stringWithFormat:@"昨天 %@", [dateformatter stringFromDate:date]];
            
        }else{//昨天之前
            [dateformatter setDateFormat:@"MM-dd HH:mm"];
            return  [dateformatter stringFromDate:date];
        }
        
    }else{
        [dateformatter setDateFormat:@"yyyy-MM-dd HH:mm"];
        return [dateformatter stringFromDate:date];
    }

}

- (NSString *)FormatTime:(NSString *)format timeInterval:(double)value;
{
    NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
    NSDate *date = [NSDate dateWithTimeIntervalSince1970:value / 1000];
    [dateformatter setDateFormat:format];
    return [dateformatter stringFromDate:date];
}

获取两个时间的间隔

NSDateFormatter *dateFomatter = [[NSDateFormatter alloc] init];
dateFomatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";


// 截止时间字符串格式
NSString *expireDateStr = status.expireDatetime;
// 当前时间字符串格式
NSString *nowDateStr = [dateFomatter stringFromDate:nowDate];
// 截止时间data格式
NSDate *expireDate = [dateFomatter dateFromString:expireDateStr];
// 当前时间data格式
nowDate = [dateFomatter dateFromString:nowDateStr];
// 当前日历
NSCalendar *calendar = [NSCalendar currentCalendar];
// 需要对比的时间数据
NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth
| NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
// 对比时间差
NSDateComponents *dateCom = [calendar components:unit fromDate:nowDate toDate:expireDate options:0];



年差额 = dateCom.year, 月差额 = dateCom.month, 日差额 = dateCom.day, 小时差额 = dateCom.hour, 分钟差额 = dateCom.minute, 秒差额 = dateCom.second

判断当前时间是否过期

 NSDate *nowDate = [NSDate date];
    NSDateFormatter *dateFomatter = [[NSDateFormatter alloc] init];
    dateFomatter.dateFormat = @"yyyy-MM-dd HH:mm:ss.0";
    // 截止时间字符串格式
    NSString *expireDateStr = model.endtime;
    // 当前时间字符串格式
    NSString *nowDateStr = [dateFomatter stringFromDate:nowDate];
    // 截止时间data格式
    NSDate *expireDate = [dateFomatter dateFromString:expireDateStr];
    // 当前时间data格式
    nowDate = [dateFomatter dateFromString:nowDateStr];
    
    int status = [self compareOneDay:nowDate withAnotherDay:expireDate];
   

- (int)compareOneDay:(NSDate *)oneDay withAnotherDay:(NSDate *)anotherDay
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
    NSString *oneDayStr = [dateFormatter stringFromDate:oneDay];
    NSString *anotherDayStr = [dateFormatter stringFromDate:anotherDay];
    NSDate *dateA = [dateFormatter dateFromString:oneDayStr];
    NSDate *dateB = [dateFormatter dateFromString:anotherDayStr];
    NSComparisonResult result = [dateA compare:dateB];
    NSLog(@"oneDay : %@, anotherDay : %@", oneDay, anotherDay);
    if (result == NSOrderedDescending) {
        //在指定时间前面 过了指定时间 过期
        NSLog(@"oneDay  is in the future");
        return 1;
    }
    else if (result == NSOrderedAscending){
        //没过指定时间 没过期
        //NSLog(@"Date1 is in the past");
        return -1;
    }
    //刚好时间一样.
    //NSLog(@"Both dates are the same");
    return 0;
}