imo, if i am using Georgian i want that system even retroactively, just like projecting a date back into the stone age. I don't care that a particular geography or culture changed calendars.
So I suppose what is really going on is that some libraries are using Georgian consistently, and others are using some hybrid "civic" calendar that tracks what the romans and the catholics were using, so dates in history books make sense.
'A date object represents a date (year, month and day) in an idealized calendar, the current Gregorian calendar indefinitely extended in both directions.'
'This matches the definition of the “proleptic Gregorian” calendar in Dershowitz and Reingold’s book Calendrical Calculations.'
https://docs.python.org/3/library/datetime.html#id2 https://docs.python.org/3/library/datetime.html#id5
Whereas Ruby has proleptic Gregorian Time, but civic DateTime:
https://ruby-doc.org/stdlib-2.6.1/libdoc/date/rdoc/DateTime....
I’ll draft a Dubia so that when future popes change the calendar they will include a representative code sample and details about how we handle this.
(It’s important to remember that the pope and friends were operating much more like an international standards body than a religious leader when doing things like this.)
https://en.wikipedia.org/wiki/List_of_non-standard_dates#Feb...
Tried using ncal like in the examples in that blog post, but it did not work correctly using either Julian or Gregorian. Of course the Swedish calendar from 1700-1712 was neither, but somewhere in-between, because of the (failed) attempt to gradually move from one to the other.
Meta: one can also link to this article, which redirects:
Technically, they switched to the Revised Julian[0] calendar, not the Gregorian. Also, it was only some of the churches making up Eastern Orthodoxy that switched; others remain on the Julian calendar to this day, and all of them still use the Julian calendar to calculate the date of Pascha.
tl;dr - ActiveSupport::TimeWithZone used absolute seconds counting to determine dates while DateTime used a proper Gregorian calendar. This means dates before October 15, 1582 have different internal values when compared.
The behavior showed up because a test was using a DateTime value to set a MySQL DATETIME column to the DB minimum value, which is 1000-01-01 00:00:00, and then comparing the DB record attribute to the original variable used to set it.
Something like:
date = DateTime.new(1000, 1, 1, 0, 0, 0, 'UTC')
record.update(happened_at: date)
record.happened_at == date # => false
It would natively display "Future" if the file timestamp was ahead of the system clock, but you could also add dates. I remember seeing directory listings like
xyzzy.foo 49152 ----rw-d Christmas 1988And if there is a contract dated to the 6th October 1582, that does raise questions about its legitimacy (though in general misdating a contract does not void it, it would merely be one point of evidence in your argument that it's a forgery, just like using a particular font in a modern printed contract)
laveur•41m ago
Cthulhu_•21m ago