Function in Code.gs file

function formatDate(date) {
  var formattedDate = Utilities.formatDate(date, 'GMT+3', 'dd.MM.yyyy');
  return formattedDate;
}

index.html file,
Data coming from the table to the modal form for editing in the table

                editButtons.forEach(function(button) {
                    button.addEventListener('click', function() {
                        const id = button.getAttribute('data-id');
                        currentEditId = id;
                        google.script.run.withSuccessHandler(function(employee) {
                      
                            document.getElementById('ise-giris-tarihi').value = employee.iseGirisTarihi;
                            
                            const employeeModal = new bootstrap.Modal(document.getElementById('employee-modal'));
                            employeeModal.show();
                        }).getEmployeeById(id);
                    });
                });

There is an edit data button on the index page. When I click on the edit button, I want the date format to appear as dd.mm.yyyy. How can I adjust the date format? For example, it says 30.06.2024 in the e-table, but the data does not come to the modal form.