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+(NSString*)GetDetailTime{    //获得系统时间    NSDate * senddate=[NSDate date];    NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];    //[dateformatter setLocale:[NSLocale localeWithLocaleIdentifier:@""]];    [dateformatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSString * morelocationString=[dateformatter stringFromDate:senddate];    //    NSArray*array=[morelocationString componentsSeparatedByString:@"-"];    return morelocationString;}

//计算当前时间往后推days天-(NSDate *)dateAfterDays:(int)days{    NSCalendar *calendar = [NSCalendar currentCalendar];    unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit;    NSDateComponents *components = [calendar components:unitFlags fromDate:[NSDate date]];    [components setDay:([components day]+days)];    return [calendar dateFromComponents:components];}

//获取网络服务器时间+(void)getNetTimeWithCompleteHandle:(void(^)(BOOL isSuccess,NSDate* date))complete{    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];    NSString * urlstr = @"https://www.baidu.com";    NSURL *url = [NSURL URLWithString:urlstr];    NSMutableURLRequest *muRequest = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:2.0f];    muRequest.HTTPMethod = @"GET";    NSURLSessionDataTask *task = [manager dataTaskWithRequest:muRequest completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {               //}        NSHTTPURLResponse *httpResponse=(NSHTTPURLResponse *)response;        //if ([response respondsToSelector:@selector(allHeaderFields)]) {
           NSDictionary *dict=[httpResponse allHeaderFields];        NSString *time=[dict objectForKey:@"Date"];        NSString *timeStr=[time substringWithRange:NSMakeRange(5, 20)];//截取字符串        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];        NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"GMT"];        NSLocale *local=[[NSLocale alloc]initWithLocaleIdentifier:@"en_US_POSIX"];        [formatter setLocale:local];//需要配置区域，不然会造成模拟器正常，真机日期为null的情况        [formatter setTimeZone:timeZone];        [formatter setDateFormat:@"dd MMM yyyy HH:mm:ss"];//设置源时间字符串的格式        NSDate* date = [formatter dateFromString:timeStr];//将源时间字符串转化为NSDate        long timesecond = date.timeIntervalSince1970;        if (error==nil) {            complete(YES,date);        }else{            complete(NO,date);        }    }];    [task resume];}

//计算两个时间差是几天NSDateFormatter *formater= [[ NSDateFormatter alloc]init];    [formater setDateFormat:@"yy/MM/dd"];    NSDate *  expireD = [formater dateFromString:expireDate];    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];    NSDateComponents *comps = [gregorian components:NSCalendarUnitEra fromDate:expireD1  toDate:expireD  options:0];    NSInteger days = [comps day];    NSLog(@"%ld天",(long)days);

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