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I think it's a fine illustration of the concept of calendar?

For a tiny icon it would have been a reasonable compromise in interest of readability at low resolution, but here it just comes across as a sloppy mistake.

Well, it also seems to have only 24 days. So maybe it's an https://en.wikipedia.org/wiki/Advent_calendar

7 day weeks are part of the paid plan

Looks like they just start on Sunday, which is a different colour.

They helpfully put numbers in that suggest that’s not at all what’s going on.

The same reason cartoon characters have three fingers.