Submit on click date validation

var today = new Date();
        var mm = today.getMonth()+1;//January is 0!`
        var yyyy = today.getFullYear();
        if(mm<10){mm='0'+mm}
        var month_year = mm+'-'+yyyy;

        $("#fromMonth").datepicker({
            format: "mm-yyyy",
            viewMode: "months",
            minViewMode: "months"
        });
        $('#toMonth').datepicker({
            format: "mm-yyyy",
            viewMode: "months",
            minViewMode: "months",
            maxDate: new Date()
        });

$( "#Submit" ).click(function() {
            var fromMonth = $('#fromMonth').val();
            var toMonth   = $('#toMonth').val();
            var select_users  = $('#select_users').val();

            var fromdate = '01-'+fromMonth;
            var todate   = '01-'+toMonth;
            if(Date.parse(fromdate) > Date.parse(todate)){
                alert("To Month should be greater than From Month");
                return false;
            }
        });