In javascript check the date is not grater than todays date




 <asp:TextBox ID="txtJoiningDatemain" runat="server" TabIndex="15"></asp:TextBox>

 <AjaxControlToolkit:CalendarExtender ID="calJoiningDatemain" Format="dd/MM/yyyy"
                                                                runat="server" TodaysDateFormat="dd, MM, yyyy" TargetControlID="txtJoiningDatemain"
                                                                Enabled="True" OnClientDateSelectionChanged="checkDate">
                                                            </AjaxControlToolkit:CalendarExtender>
                                                            <AjaxControlToolkit:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" runat="server"
                                                                TargetControlID="txtJoiningDatemain" WatermarkText="Date" WatermarkCssClass="TxtWatMarkDate"
                                                                Enabled="True">
                                                            </AjaxControlToolkit:TextBoxWatermarkExtender>

function checkDate(sender, args) {

    if (sender._selectedDate > new Date()) {
        alert("Selected date is greater than todays date !");
        sender._textbox.set_Value()="";
            }
}

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