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On post back the value entered to an element using javascript is gone

I have asp:button, whoch on click calls a javascript function to assign the date to a html (p) element. I can see the datetime for a second, but I think on postback the value of the element is gone. How do I make sure after the user clicks on the button the datetime value is still shown. I have attached the code thnaks
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    
    <script type="text/javascript">
        function displayDate() {
            document.getElementById("demo").innerHTML = Date();
        }
</script>
</head>
<body>
    <form id="form1" runat="server">
    
    
<h1>My First Web Page</h1>

<p id="demo"></p>
<asp:Button ID="btn" Text="disp" runat="server" OnClientClick="return displayDate();" />
</form>
</body>
</html>

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BurnieP
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oh perfect thx
thx