Hi sat,
Refer the below code.
Using DynDateTime jQuery Plugin
<asp:TextBox ID="TextBox1" runat="server" ReadOnly="true"></asp:TextBox>
<asp:Button ID="btnSave" runat="server" Text="Save" OnClick="btnSave_Click" />
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script src="Scripts/jquery.dynDateTime.min.js" type="text/javascript"></script>
<script src="Scripts/calendar-en.min.js" type="text/javascript"></script>
<link href="Styles/calendar-blue.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
$(document).ready(function () {
$("#<%=TextBox1.ClientID %>").dynDateTime({
showsTime: true,
ifFormat: "%Y/%m/%d %H:%M",
daFormat: "%l;%M %p, %e %m, %Y",
electric: false,
singleClick: true,
displayArea: ".siblings('.dtcDisplayArea')"
});
});
</script>
Screenshot

Using jQuery DatePicker
<asp:TextBox ID="txtDate" runat="server" ReadOnly="true"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"
type="text/javascript"></script>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css"
rel="Stylesheet" type="text/css" />
<script type="text/javascript">
$(function () {
$("[id*=txtDate]").datepicker({});
});
</script>
Screenshot
