What are functions replaced with in Typescript ?

Hi ,

I am migrating code from Javascript to TypeScript

I have the following

function myDateDialog()

{

var retDay;

var retMonth;

var retYear;

}

function openDatePickerDialog(wnd, field, dateFormat) {

myDateDialog.retDay = "";

myDateDialog.retMonth = "";

myDateDialog.retYear = "";

var dlgURL = '../DatePicker.htm';

field.value = dateFormat.replace(/yyyy/, myDateDialog.retYear).replace(/MM/, myDateDialog.retMonth).replace(/dd/, myDateDialog.retDay);

what would be the best to replace the Javascript code

function myDateDialog() , would a class be best and declare retDay , retMonth and retYear as properties ?

Then instantiate the class in openDatePickerDialog and set the properties values ?

or is there a better approach ?

Thanks