当我们需要获取网络时间的时候，我们可以从服务器是获取，但是对于没有自己服务器的小伙伴来说，只能从网络上获取了，这里我们是从百度来获取网络时间，具体代码如下：

- (NSDate *)getInternetDate
{
     NSString *urlString = @"http://m.baidu.com";
     urlString = [urlString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
     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];
 
     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];
    
    NSTimeZone *zone = [NSTimeZone systemTimeZone];
    NSInteger interval = [zone secondsFromGMTForDate: netDate];
    NSDate *localeDate = [netDate  dateByAddingTimeInterval: interval];
    return localeDate;
}

这样获取的就是网络的北京时间