Hi, I am not sure weather it is possible in ajax calendar extender but in is achiveable in
jQuery UI DatePicker [
^]
<script type="text/javascript">
$(document).ready(function () {
$("#txtDate").datepicker(function() {
numberOfMonths: 2
});
});
</script>
<asp:textbox runat="server" id="txtDate" xmlns:asp="#unknown" /></script>