How to get Date From Internet in asp.net

Please refer below code

Using C#

public static DateTime GetFastestNISTDate() { var result = DateTime.MinValue;     
 // Initialize the list of NIST time servers
        // http://tf.nist.gov/tf-cgi/servers.cgi
        string[] servers = new string[] {
"nist1-ny.ustiming.org",
"nist1-nj.ustiming.org",
"nist1-pa.ustiming.org",
"time-a.nist.gov",
"time-b.nist.gov",
"nist1.aol-va.symmetricom.com",
"nist1.columbiacountyga.gov",
"nist1-chi.ustiming.org",
"nist.expertsmi.com",
"nist.netservicesgroup.com"
};
 
        // Try 5 servers in random order to spread the load
        Random rnd = new Random();
        foreach (string server in servers.OrderBy(s => rnd.NextDouble()).Take(5))
        {
            try
            {
                // Connect to the server (at port 13) and get the response
                string serverResponse = string.Empty;
                using (var reader = new StreamReader(new System.Net.Sockets.TcpClient(server, 13).GetStream()))
                {
                    serverResponse = reader.ReadToEnd();
                }
 
                // If a response was received
                if (!string.IsNullOrEmpty(serverResponse))
                {
                    // Split the response string ("55596 11-02-14 13:54:11 00 0 0 478.1 UTC(NIST) *")
                    string[] tokens = serverResponse.Split(' ');
 
                    // Check the number of tokens
                    if (tokens.Length >= 6)
                    {
                        // Check the health status
                        string health = tokens[5];
                        if (health == "0")
                        {
                            // Get date and time parts from the server response
                            string[] dateParts = tokens[1].Split('-');
                            string[] timeParts = tokens[2].Split(':');
 
                            // Create a DateTime instance
                            DateTime utcDateTime = new DateTime(
                                Convert.ToInt32(dateParts[0]) + 2000,
                                Convert.ToInt32(dateParts[1]), Convert.ToInt32(dateParts[2]),
                                Convert.ToInt32(timeParts[0]), Convert.ToInt32(timeParts[1]),
                                Convert.ToInt32(timeParts[2]));
 
                            // Convert received (UTC) DateTime value to the local timezone
                            result = utcDateTime.ToLocalTime();
 
                            return result;
                            // Response successfully received; exit the loop

                        }
                    }
 
                }
 
            }
            catch
            {
                // Ignore exception and try the next server
            }
        }
        return result;
    }

OR

var request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("http://www.aspsnippets.com/");
var response = request.GetResponse();
string todaysDates = response.Headers["date"];
DateTime dateTime = DateTime.ParseExact(todaysDates, "ddd, dd MMM yyyy HH:mm:ss 'GMT'", System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat, System.Globalization.DateTimeStyles.AssumeUniversal);

using Javascript

refer for example, (this) and (this)

<div>
    <input id="btn" type="button" value="Get Current Time" />
    <p id="tm" />
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
    <script type="text/javascript">
        $.ajax({
            dataType: 'jsonp',
            url: 'http://timeapi.org/utc/now.json',
            success: function (result) {
                alert(result.dateString);
            }
        });
    </script>
</div>

I hope this will help you out.