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We still have this sort of thing today. In the occupied West Bank, Israeli settlers change to daylight savings time on a different day than the Palestinians

> It’s actually worse than that. It wasn’t always whole coubtries who decided to adopt (or not) but cities and sometimes people within cities (i.e. the protestants in the city would be lagging, or maybe I’m misremembering and this was about people who where abroad)

There was some of that indeed, depending on the centralization of the country e.g. Spain and France adopted the gregorian calendar wholesale because the king decreed it, but in less centralised countries like the Dutch Republic or Switzerland it happened by region (the seven catholic cantons switched to the gregorian calendar in 1584, the protestant canton only switched over piece by piece during the 18th century, and Schiers and Grüsch were the last remnants of Julian calendar in the entirety of western europe, only adopting the gregorian calendar in 1812).

... and then there's Sweden, which started on a plan to gradually approach the Gregorian calendar by skipping leap years over 40 years, except they immediately forgot to skip the second and third so concluded the plan was stupid, then instead of switching to gregorian they reverted to julian, before finally switching to gregorian 40 years after that.

> Astronomers used it

And still use, in fact!

Julian date works exactly like Unix epoch, but instead of starting in junary 1 1970 it starts something like 2500 years ago.

Super easy for astronomy as you don't need to handle timezones and other junk

Sounds like they just ignore any calendar weirdness. I don't envy anyone the task of trying to properly program this. You basically have to decide for everything time related in the simulation whether it is tied to the calendar or the physical passage of time. Sometimes you would have to split variables, like characters are legally older, but no closer to old age. Bonus points if your solution allows characters to get into conflict with each other about stuff like when a treaty ends or whether their loans are due 15 days sooner.

My initial thought was that that would probably be taking the simulationism too far. My second thought was how funny it would be to swap calendars to get out of a truce early.

“My Lord, you can attack them until March of next year!”

“Then March of next year it shall be!”

EU3 and EU4 at least had no leap years. I assume 1, 2 and 5 are the same.

Checking the wiki, eu5 has an advance (guess these are like the nation ideas in eu4?) for Julian calendar which gives you +10% to orthodox or miaphysite nations. I doubt it has any effect in the calendar system in the games UI.

Some notes:

Paradox's Clausewitz game engine seems to handle "negative" years very poorly, so stuff like historical Roman emperors in Crusader Kings have some oddities. It's probably also why Imperator: Rome uses ab urbe condita dating (aside from immersion).

The Elder Kings 2 mod actually has custom date handling (it's actually a custom date localisation system) to enable transitioning to the 3rd era on founding the Empire of Tamriel.

In an agrarian economy people are definitely much MORE attuned to the cycles of the seasons. If your town always starts planting crop X two weeks before the solstice, and the harvest festival is the week after the equinox, you’re going to keep track of these things.

If I recall correctly - it was surprisingly well known (in fact it was a common way to make fun of "lettered" people because they'd claim dates that were obviously silly; everyone knew when the solstice was).

Some of the earliest things we have a sun-based calendar trackers, which need not be more complicated than a stick and a rock (meaning millions more have not survived).

It also prevents all kinds of clients who (for various reasons) can't implement SSL from visiting your website. I'm sure this is a "small web" blog, whose author wants to be visited by e.g. a Commodore 64, an OS 9 iMac, or somebody who just wants to telnet in. If the sensitivity of the information on this page was critical or you were going to be submitting information then by all means yes, SSL is important, but if you're going to be reading a personal blog about calendars then http is probably fine. Of course the ideal solution is offering both and letting the client choose.

Man I really hope this doesn't get autoflagged because people need to see that this is an opinion people actually have, and what the (justified) reaction to it is.

HTTPS on a blog does nothing. It doesn't protect you from anything. I guarantee you're not getting "all kinds of MITM injections" on this block of text. The only reasonable desire I can think of for "HTTPS everywhere" is hiding the content from your ISP but a) they still see the URL so they can get the content if they want it, and b) if you're so worried about that, use a VPN which coincidentally is even better because it will also hide the URL, and most importantly c) it puts the onus on you, the person who wants the thing, instead of hundreds or thousands or tens of thousands of text-only website owners who rightly couldn't care less about HTTPS.

MITM attack on a read-only text webpage... okay.

More annoying is the slightly shiny/shaded text that is supposed to highlight something. Who chose this style palette?

I think you would have a better argument if you said something like: "I don't want my ISP knowing about the content I read" or something along those lines. MITM for a text download is like saying we have to have https for dns (yes DoH exists now), but the point still stands. You aren't sending any sensitive data to the website, MITM is unlikely.

Surprised this is downvoted. Chrome forces me to click through a warning to even visit HTTP sites nowadays.