I known, hence I used 'assumed' calendar days.
And, in your another post, you disclosed that it maybe Dutch time.
I known that it's better if I can pinpoint exactly calendar time, but even Theymos have not cared about that (I remembered that I read Theymos' opinion at this point some place in the forum).
One more thing, if I used these assumed calendar days in Dutch time, the first day is probably incomplete day.

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To sum up, I think that it's acceptable to call it as assumed calendar days in Dutch time with a note.