获取当前网络时间

/**
* 获取网络当前时间
*/
- (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;
}