Most presentations are usually dated, or at least some of the jokes are! We will add a convenient button for the user to add a date to the presentation using the HTML5 input type date, which provides a graphical date picker:

<input type="date" id="selDate" value="2000-01-01"/>

The default value is set in the index.html page as follows:

The valueAsDate property of the DateInputElement class provides the Date object, which can be added to the text area:

void insertDate(Event event) {
  DateInputElement datePicker = querySelector("#selDate");
  if (datePicker.valueAsDate != null) presEditor.value =presEditor.value + datePicker.valueAsDate.toLocal().toString();
}

In this case, the toLocal method is used to obtain a string formatted to the month, day, and year format.