Validate date using Javascript

source : http://www.java2s.com/Tutorial/JavaScript/0520__Regular-Expressions/UseRegularExpressiontovalidatedate.htm

<script type="text/javascript" src="../script/JqueryMinVer.js">script>

    <script type="text/javascript">

        $(document).ready(

        function () {

            $("[id$='btnLoadStatistics']").click(

          function () {

              return validate();

          }

         );

            function isValidDate(sText) {

//var dateRegex = new RegExp("^([0-2][0-9]|[3][0-1]|[0-9])/([0][0-9]|[1][0-2]|[0-9])/([1][8-9][0-9][0-9]|[2][0-9][0-9][0-9])$")

var reDate = /(?:0[1-9]|[12][0-9]|3[01])\/(?:0[1-9]|1[0-2])\/(?:19|20\d{2})/;

                return reDate.test(sText);

            }

            function validate() {

                var strDate = $("[id$='txtDate']").val();

                if (isValidDate(strDate)) {

                    return true;

                } else {

                    return false;

                }

            }

        }

);

script>