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In the ISO week date standard (ISO-8601), December 30 and 31 2019 are part of the first week of 2020. In the US, since weeks start on Sunday, December 29...

46 BCE had 445 days due to the calendar reform instituted by Gaius Julius Caesar. See https://en.wikipedia.org/wiki/46_BCE

This does still hold true for now, but who knows for how much longer 😬 > At the moment the Earth is rotating faster than in recent decades: these shorter...

For example, in UTC, leap seconds may impact a day, but Daylight Savings Time rules do not apply. So a day is always 24 hours long, plus or minus leap...

False. This is more of an implementation fallacy, but I figured I'd share it anyways (up to you if it fits). https://en.m.wikipedia.org/wiki/Leap_second#:~:text=Implementation%20differences,-This%20section%20needs&text=Not%20all%20clocks%20implement%20leap,servers%20declare%20%22alarm%20condition%22. The implementation of leap seconds varies across systems....

Some years have 53 weeks (https://en.wikipedia.org/wiki/ISO_week_date#Weeks_per_year)

You mentioned Israel a few times but not in the section about weekends you forgot to mention that a weekend there (at least business-wise) is also Friday and Saturday.

I noticed this problem while driving from my brother's home in the Central Time Zone to my home in the Eastern Time Zone. I inevitably cross between time zones between...

False. Morocco for example used to have 2 clock shifts per uear for DST, plus 2 clock shifts for Ramadan. https://www.timeanddate.com/news/time/morocco-abolishes-time-changes.html