When it is used
Dates are never guessed. You opt in by adding data-type="date" to the element holding the token, typically a <time>.
Because it is explicit, an ordinary number or string never turns into a date control by accident.
Example
Add data-type="date" to opt in:
<time datetime="{published}" data-type="date">{published}</time>In the editor
In the editor this is a date picker.
It pairs naturally with a <time> element, so the published page carries a machine-readable date too.