Date fields can be regarded as a subtype of text fields. The date can be entered manually or selected from the pop-up calendar.

Dates can be entered without a date separator, but are shown and saved with the date separator set in Windows Regional Settings.

Open the calendar by clicking the down-pointing arrow.

Select a date by left-clicking it. Alternatively, use the cursor keys to move around and to confirm the selection. Click the Today button to quickly set today's date.

On the left you can see current week of year (for informative purposes).

Use and  to move back and forth between months and years.

The month can also be selected by left-clicking the month name in the calendar header and selecting it from a list of adjacent months.

The same can be done when setting year. Left-click the currently selected year and a lookup appears where you can select it.