1、获取网络日期时间

/// <summary>  
/// 获取网络日期时间  
/// </summary>  
/// <returns></returns>  
public static string GetNetDateTime()  
{  
    WebRequest request = null;  
    WebResponse response = null;  
    WebHeaderCollection headerCollection = null;  
    string datetime = string.Empty;  
    try  
    {  
        request = WebRequest.Create("https://www.baidu.com");  
        request.Timeout = 3000;  
        request.Credentials = CredentialCache.DefaultCredentials;  
        response = (WebResponse)request.GetResponse();  
        headerCollection = response.Headers;  
        foreach (var h in headerCollection.AllKeys)  
        { if (h == "Date") { datetime = headerCollection[h]; } }  
        return datetime;  
    }  
    catch (Exception) { return datetime; }  
    finally  
    {  
        if (request != null)  
        { request.Abort(); }  
        if (response != null)  
        { response.Close(); }  
        if (headerCollection != null)  
        { headerCollection.Clear(); }  
    }  
}

2.调用

string dt = GetNetDateTime();  
Console.WriteLine(Convert.ToDateTime(dt).ToString("yyyy-MM-dd HH:mm:ss"));  
Console.ReadLine();

案例下载

链接：https://pan.baidu.com/s/1t_iqNSWd4X8-FhboBrFFLw 
提取码：yakf