Gregorian Calendar Reform
-------------------------
Countries adopted the Gregorian calendar at different times. When using →days←
or →date← for historical dates in other than the UK or Eastern Seaboard USA,
use a left argument from the following table:
⍺∘days ⍺∘date
------ ------
Albania · · · · 19121201 4731
Austria (Salzburg) · 15831005 ¯115494
Bulgaria · · · 19160331 5947
Czech (Bohemia Moravia) 15840106 ¯115401
Denmark · · · · 17000218 ¯72989
Egypt · · · · 18750101 ¯9118
Finland · · · · 17530217 ¯53631
France · · · · 15821209 ¯115794 P
Greece · · · · 19240309 8847
Italy · · · · 15821004 ¯115860 R
Ireland · · · · 17520902 ¯53799 L
Japan · · · · 18730101 ¯9848 J
Russia · · · · 19180131 6618
Poland · · · · 15821004 ¯115860 R
Portugal · · · 15821004 ¯115860 R
Spain · · · · 15821004 ¯115860 R
Sweden · · · · 17530217 ¯53631
Turkey · · · · 19270101 9875
UK · · · · · 17520902 ¯53799 L
USA, Eastern Seaboard 17520902 ¯53799 L
USA, Mississippi valley 15821209 ¯115794 P
USA, TX FL CA NV AZ NM 15821004 ¯115860 R
USA, WA OR · · · 17520902 ¯53799 L
USA, AK · · · 18671001 ¯11767
R: Same as Rome.
L: Same as London.
P: Same as Paris.
J: The Gregorian calendar replaced the traditional Japanese calendar 1873-01-01.
Example:
tx_days←15821004∘days ⍝ Texas conversions.
tx_date←¯115860∘date
va_days←17520902∘days ⍝ Virginia conversions.
va_date←¯53799∘date
⍝ John Rolfe married Pocahontas on 1614-04-05(VA). If guests were expected
⍝ from Texas or Florida, the wedding planning must have been a nightmare:
3↑tx_date va_days 1614 4 5 ⍝ Apr 1614: 5 (VA) -> 15 (TX)
1614 4 15
See also: Dates days date
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