validation fromdate and todate with future date validation in javascript

 <script type="text/javascript">

        //This code is developed to validation fromdate and todate with future date validation in javascript in a web page.

        function ValidateDate() {

            var Fromdate = document.getElementById('<%= txtFromdate.ClientID %>').value;

       

            var Todate = document.getElementById('<%= txtTodate.ClientID %>').value;

         

            if (Fromdate == "") {

                alert("From date should not be empty");

                return false;

            }

            else if (check_futuredate(Fromdate) == false) {

                alert("From date is greater than today's date ");

                return false;

            }

            if (Todate == "") {

                alert("To date should not be empty");

                return false;

            }

            else if (check_futuredate(Todate) == false) {

                alert("To date is greater than today's date ");

                return false;

            }

            if ((Date.parse(Fromdate) == Date.parse(Todate))) {

               // alert("To date should be greater than From date");

                return true;

            }

            else if ((Date.parse(Todate) <= Date.parse(Fromdate))) {

                alert("To date should be greater than From date");

                return false;

            }

            

        }

        function check_futuredate(chkdate) {

            var chkdate = chkdate; //document.getElementById('<%= txtFromdate.ClientID %>').value;

            var edate = chkdate.split("-");

            var spdate = new Date();

            var sdd = spdate.getDate();

            var smm = spdate.getMonth();

            var syyyy = spdate.getFullYear();

            var today = new Date(syyyy, smm, sdd).getTime();

            var e_date = new Date(edate[2], edate[1] - 1, edate[0]).getTime();

            if (e_date > today) {

                //alert("From date is greater than today's date ");

                return false;

            }

           

        }

    </script>

 <asp:Button ID="btnSubmit" runat="server" Text="Submit"                         Style="width: 61px; color: #FFFFFF;"  BackColor="#FF6804"  OnClientClick="return ValidateDate();"                        OnClick="btnSubmit_Click" />