How Do I Change Year In Bootstrap Datepicker

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ASP.NET

bootstrap

I am using bootstrap date picker but its not working fine because when i select a particular year among a specific range then directly date in displayed in a text box month selecting is not appear
For Example If i want to select 31 Oct 1989 then i will select the year 1989 from
1980-1989 after selecting 1989 it doesn't allow me to select a month it directly display a date in a text box such as 1989-09-01

Here is my script for selecting date

<script type="text/javascript">
        $(document).ready(function () {
            var dp = $('#<%=txt_birthdate.ClientID%>');
            dp.datepicker({
                changeMonth: true,
                changeYear: true,
                format: "yyyy-mm-dd",
                language: "tr"
            }).on('changeDate', function (ev) {
                $(this).blur();
                $(this).datepicker('hide');
            });
        });
    </script>

Here is my code for a Text Box

<div class="form-group col-md-4" id="birthdate">
                                <label>
                                    Date Of Birth :
                                </label>
                                <asp:TextBox ID="txt_birthdate" runat="server" CssClass='form-control' ClientIDMode="Static"
                                    placeholder="Date Of Birth"></asp:TextBox>
                            </div>

Please help me to solve this problem