open a datepicker in cockpit or tasklist and switch to manual date/time input (button with pencil icon)
the input field is empty, when cancelling the empty/null value is accepted (displayed as '??)
- Expected behavior
The input field is focused.
Initially the value field should contain the date-time value that was selected in the datepicker.
The value should be selected so that it will be deleted when the user starts to enter a new value.
When the user cancels, confirms with no change, or clicks outside the last persisted value should be displayed (true cancellation of edit)