//Error
jQuery(…).datepicker is not a function

//Solution
var $j = jQuery.noConflict();
$j( “.date_picker” ).datepicker({
});
Some of options

https://jqueryui.com/datepicker/#dropdown-month-year

//Show year and months
changeMonth: true,
changeYear: true

//Desable previous dates
minDate: 0

Date picker in wordpress admin dashboard