I mean we define year as being from one spring equinox¹ to the next, no matter if it's 365 or 366 days. So if we made next year 1 it would be from 20th of March 2026 14:46 UTC to the next 20th of march 2027 20:25 UTC (The first day of the year could be day 0, the last of the old year but still also in new year, to account for the fact that it's not midnight.). The months would be replaced with quarters(seasons), ending on: June 21, September 23, December 21. Every year the dates would slightly shift because of the way orbits work, but there is no leap year math.

The first quarter, spring, has 93 days, the second, summer, 94 and so on. These will probably be subdivided a multitude of ways. Quickly sketching I found 6 * 4 * 4 - (3 or 4) which seems to work, though I'm naturally draw to base6 due to it being highly composite. This makes 24 days in a quarter-season. A nice analogue to the hours.

I think this calendar works better because it doesn't attempt to add any human control over a completely chaotic system: Earths orbit speed and rotational period. The underlying principle is chaotic and humans should build systems that are build on top of this natural disorder. By attempting to define and control disorder you must create so many convoluted rules (Like the leap day rule). Our calendar is an example of the human desire to "fix" nature to our own way of life instead of leaning to coexist with the natural disorderly processes that govern our lives. It's the same mindset that gives us the blatant disregard for the natural resources or climate.

This is a rather anarchic position but that's because I cannot help but inject anarchic rhetoric into my thought process due to so much of the way we live has been in blatantly build using archic concepts, even the calendar is dripping with it.

¹: Accidentally called it solstice sense I forgot there's a different word.