For info, as I get inconsistent results depending on browser. I get that there’s not much control available for this…!
Dark theme used throughout.
Ubuntu, Firefox
Clicking on either dd, mm, or yyyy gives the below - no time picker. Clicking anywhere else provides nothing. After selecting a date, user has to manually enter a time before the check icon can be clicked, otherwise nothing happens.
Ubuntu, Chromium
The picker only comes up when clicking the almost invisible calendar icon, but at least you can choose the time! Picker doesn’t respect the theme settings.
Android, Chrome & Brave
Note the empty input field.
Tapping the input field provides this pop-up.
Tapping the check icon to accept the date time then clears the input field again, so it’s empty.