获取网络时间

- (NSDate *)getInternetDate

{

    NSString *urlString = @"http://m.baidu.com";

    urlString = [urlString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

    // 实例化NSMutableURLRequest，并进行参数配置

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

    [request setURL:[NSURL URLWithString: urlString]];

    [request setCachePolicy:NSURLRequestReloadIgnoringCacheData];

    [request setTimeoutInterval: 2];

    [request setHTTPShouldHandleCookies:FALSE];

    [request setHTTPMethod:@"GET"];

    

    NSHTTPURLResponse *response;

    [NSURLConnection sendSynchronousRequest:request

                          returningResponse:&response error:nil];

    

    // 处理返回的数据

    //    NSString *strReturn = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    

    NSLog(@"response is %@",response);

    NSString *date = [[response allHeaderFields] objectForKey:@"Date"];

    date = [date substringFromIndex:5];

    date = [date substringToIndex:[date length]-4];

    

    

    NSDateFormatter *dMatter = [[NSDateFormatter alloc] init];

    

    dMatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];

    [dMatter setDateFormat:@"dd MMM yyyy HH:mm:ss"];

    

    NSDate *netDate = [[dMatter dateFromString:date] dateByAddingTimeInterval:60*60*8];

    return netDate;

}