I do not understand your question much, it allows you to create tasks for the whole day and places them above first on the specified day or you cannot create tasks for the whole day
Anyway, take a look at this post
I have this same question, and it is specific to the Calendar Power Up, not the native Trello Calendar view (which the articles you cited refer to).
I want to see the due dates for my Check List items, not just see the card-level information on a calendar (the latter being what the native calendar view does).
The Power up displays the checklist items on a calendar, and syncs into my personal icalendar, but assigns them a random time each day.
I'd like to see all of the checklist items displayed as "all day" events so they are at the top of my calendar.
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