NSDate有关方法

    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：

+ (NSString *)acquiringTimeStamp{

      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];

      UInt64 recordTime = [netDate   timeIntervalSince1970]*1000;

      return [NSString stringWithFormat:@"%lld",recordTime];

}