[tz] [tz-announce] 2018f release of tz code and data available

Tim Parenti tim at timtimeonline.com
Sun Oct 21 17:08:54 UTC 2018

On Sun, 21 Oct 2018 at 12:51, Clive D.W. Feather <clive at davros.org> wrote:

> > and not to be
> > forgotten in other civil use was 1712 February 30
> > https://en.wikipedia.org/wiki/February_30
> Um, that one *is* normalized: it was a separate day between February 29th
> and March 1st.

Except when we're speaking of normalization, we're typically referring to
the proleptic Gregorian calendar, so that would have just been 1712 March
11, as that particular Friday was observed in Italy.

In Britain and her colonies, which still used the Julian calendar at the
time but hadn't made the same omissions as Sweden in 1704 and 1708, that
Friday was simply 1712 February 29, and Sweden, with its step back, could
move forward alongside them on the following day, March 1.

* * *

Unrelated, but the year calendar views on timeanddate.com (note the
different country settings) properly display the weirder months…

https://www.timeanddate.com/calendar/?year=1712&country=21 (Sweden has 1712
February 30 to resync with Julian calendar)
https://www.timeanddate.com/calendar/?year=1753&country=21 (Sweden adopts
Gregorian calendar by skipping 1753 February 18–28, inclusive)
https://www.timeanddate.com/calendar/?year=1752&country=9 (Britain adopts
Gregorian calendar by skipping 1752 September 3–13, inclusive)

…but, interestingly, it appears the month views only handle the cases where
the month is shorter than usual, not longer:

(doesn't show Sweden's 1712 February 30)
(properly displays Sweden's 1712 March starting on Saturday, despite the
(properly displays Sweden's short 1753 February)
(properly displays Britain's short 1752 September)

Tim Parenti
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