client date and time

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ASP.NET

Javascript

How to get Client's time? I have a gridview in my Home page in which i am displaying all the details retrieved from my database. I want to update my table's status to expired if the client's time is greater than entered time. I have a webform which is a Request Form in which i am accepting time from the user and displaying it on my homepage.

I tried using this:
In Login.aspx :

<script type="text/javascript">

            window.onload = function () {

            var newdate = new Date();

            var hdnfield = document.getElementById('<%=hdnClientDate.ClientID%>');

                hdnfield.value = newdate.toLocaleString();

        }

    </script>

<asp:HiddenField ID="hdnClientDate" runat="server" OnValueChanged="hdnClientDate_OnInit" />

In Login.aspx.cs:

protected void hdnClientDate_OnInit(object sender, EventArgs e)    {

        Session["hdnClientDate"] = hdnClientDate.Value;

    }// saving the time in session