Jquery datepicker inside update panel of Grid view ajax

 If Jquery datepicker not working inside Gridview , than use

function pageLoad() {

$(function () {

                $("#txtRetirementDate").datepicker({

                    changeMonth: true,

                    changeYear: true

                });

            });

}

function pageLoad() and plcae datepicker function inside that function

reference:- https://www.codeproject.com/Questions/1123611/Datetime-picker-not-working-inside-update-panel-af

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Also we can create jquery datepickwer by below code:- 

<script>

$(function () {

                $("#txtDob").datepicker({

                    changeMonth: true,

                    changeYear: true

                });

            });

</script>

aspx page

 <asp:TextBox ID="txtDob" ClientIDMode="Static" runat="server" Text='<%# Bind("DOB") %>'></asp:TextBox>