$(document).on("click", "#GetBirthdays", function() {
    $.ajax({
      type: "POST",
      url: "getBirthdate.php",
      contentType: "application/json;charset=utf-8",

      success: function(data) {
        console.log(data);
        $(".birthdate").html(
          "<li class='list-group-item'>" + data.name + "</li>"
        );
      }
    });
  });
});