Say it has the text “2019-11-26” and you want to change it to “2019-12-26”. You click in it and move the cursor so it is right after the “11”. You do that with your cursor keys. Except you don’t. Because if you actually do that, you move the selection in the date selector that pops up.
You click – again – into the text field but no, the website really wants you to use that date selector.
This bugs me