Working with time is full of pitfalls, especially around clock monotonicity and clock synchronisation. I wrote an article about some of those pitfalls some time ago [1]. Then, you add time zones to it, and you get a real minefield.
In any case, dates only have to make sense in the context they are used.
Eg we don't know from just the string of numbers whether it's Gregorian, Julian, or Buddhist or Japanese etc calendar.
But seriously, https://xkcd.com/1179/