Re: Moon phase on historical events

Does this take into account historical changes of timezones and calendars?

Asking, because this can get quite messy and facepalm'y. Things like countries skipping a day (or even a few weeks) are quite a normal thing. As are things like "we change how or if we use daylight savings time whenever we change government".

Tom Scott has a video in Computerphile that shows how messy things can get.

perl -e 'use Crypt::Digest::SHA256 qw[sha256_hex]; print substr(sha256_hex("the Answer To Life, The Universe And Everything"), 6, 2), "\n";'

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Re^2: Moon phase on historical events by bliako (Abbot) on Oct 29, 2021 at 15:02 UTC
Good point. The answer is I don't know, I assumed that DateTime would handle that. It seems there is something relevant here https://metacpan.org/pod/DateTime::TimeZone#$tz-%3Eoffset_for_datetime(-$dt-) `Given a DateTime object, this method returns the offset in seconds for + the given datetime. This takes into account historical time zone inf +ormation, as well as Daylight Saving Time. The offset is determined b +y looking at the object's UTC Rata Die days and seconds.` [download]	[reply] [d/l]

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Re^2: Moon phase on historical events
by bliako (Abbot) on Oct 29, 2021 at 15:02 UTC

Good point. The answer is I don't know, I assumed that DateTime would handle that. It seems there is something relevant here https://metacpan.org/pod/DateTime::TimeZone#$tz-%3Eoffset_for_datetime(-$dt-)

Given a DateTime object, this method returns the offset in seconds for
+ the given datetime. This takes into account historical time zone inf
+ormation, as well as Daylight Saving Time. The offset is determined b
+y looking at the object's UTC Rata Die days and seconds.
[download]

[reply]
[d/l]