问使用JavaScript在ASP.Net C#中进行当前日期验证

EN

                            <div class="form-group">
                                <span class="txt_orange">*</span><span class="LabelClass">Request Created on</span>
                                <br />
                                <asp:TextBox ID="txt_req_createdon_new" runat="server" CssClass="form-control dtPick funkystyling" onBlur="CheckForEmpty(this.id,'Select Start Date')" onkeyup="checkDate()" ></asp:TextBox>
                                <asp:CalendarExtender ID="CalendarExtender3" runat="server" Enabled="True" TargetControlID="txt_req_createdon_new" CssClass="red" Format="dd/MM/yyyy">`enter code here`
                                </asp:CalendarExtender>
                                <%--<asp:Label ID="Valid" runat="server" Text="Label"></asp:Label>--%>

                            </div>

                            <div id="Valid" runat="server"></div> 

function isFutureDate(idate) {
            var today = new Date().getTime(),
                idate = idate.split("/");

            idate = new Date(idate[2], idate[1] - 1, idate[0]).getTime();
            return (today - idate) < 0 ? true : false;
        }    

        function checkDate() {
            var idate = document.getElementById("txt_req_createdon_new"),
            resultDiv = document.getElementById("Valid"),

            dateReg = /(0[1-9]|[12][0-9]|3[01])[\/](0[1-9]|1[012])[\/]201[4-9]|20[2-9][0-9]/;               

            if (dateReg.test(idate.value)) {
                if (isFutureDate(idate.value)) {
                    resultDiv.innerHTML = "Entered date is a future date";
                    resultDiv.style.color = "red";
                } else {
                    resultDiv.innerHTML = "It's a valid date";
                    resultDiv.style.color = "green";
                }
            } else {
                resultDiv.innerHTML = "Invalid date!";
                resultDiv.style.color = "red";
            }

     }