This minimalist calendar has space for only a single month. So in the August–March scenario, I'd need to buy eight separate calendars for August 2025, September, October, November, December, January 2026, February, and March, in order to have places to write down what I'm doing in those months. That is, I'd need to buy one calendar for each distinct month in which I have plans at a time. (Presumably I could use dry-erase markers and reuse a month's calendar as soon as it was in the past.)
The above is the geeky/theoretical interpretation. In practice, I don't think people would buy multiple of these; I think this just doesn't function as a calendar at all.
It could be useful to display in a bank, where customers need to know today's date and nothing else... except that the calendar offers no way to mark today's date! Not even a little magnetic ring or anything. A simple flip calendar (as banks already use) is superior.
It could be useful to display in a place of business, like a 19th-century clerk's office, where no employee would want to mark events on the communal calendar but it would still be useful to see at a glance "Next Monday, that's the 17th..." Unfortunately, suppose today is the 29th. Then next Monday is the... uh... We have two problems: not only can we not see dates in the next month, but the calendar doesn't even give us a hint about the number of days in this month! There's already a small genre of office comedy about things happening on "April 31st" or "September 31st"[1]; this calendar would exacerbate that problem to the point of being counterproductive to display at all.
This calendar design isn't even a "solution in search of a problem" — it's merely several additional problems with no familial resemblance at all to a solution.
[1] - Or the inversion on "Parks & Rec" where the intern mistakenly believes that there is no "March 31st". https://en.wikipedia.org/wiki/94_Meetings
Additionally how does the user align the frame year by year? Look up the month on a normal calendar first?
for some additional help ... marking days of the week (M T W T F S S) along the top.. at least in relief might be a functional addition.
optionally a month name slider could be added at the top - obviously it won't look as "cool"
finally a smaller slider tab might be added to the frame, in order to hide the numbers 29/30/31 as needed. that tab could either be blank or have digits 1/2/3 printed on it (for next month)
My fiancée likens the weekdays to books, and the weekends to bookends. Books, bracketed by bookends, have two ends, one at either side.
If I ask you to "circle the ends of this line segment", you will circle two spots.
Of course, the problem with time is that it has a beginning. But the above is her logic for it.