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Country/region codes

The Julian/Gregorian transition dates in this table have been collected from various public domain internet sources, including a post to the usenet newsgroup comp.lan.c by Bob Douglas at the Computing Services of the University of Oxford, dated 21 Oct 1992. The date given in each case is the date the Gregorian calendar was first used.

Code	Country/Region	Transition date	Notes
AK	Alasksa	1867/10/18
AL	Albania	1912/12/1
AT	Austria	1583/10/16
BE	Belgium	1582/12/25
BG	Bulgaria	1916/4/1
CN	China	1929/1/1
CZ	Czechoslovakia	1584/1/17
DK	Denmark	1700/3/1
EG	Egypt	1875/1/1
EE	Estonia	1918/1/1
FI	Finland	1753/3/1
FR	France	1582/12/20
DE	Germany	1583/11/22	Different states actually used different dates between 1583 and 1700
UK	Great Britain	1752/9/14
GR	Greece	1924/3/23
HU	Hungary	1587/11/1
IT	Italy	1582/10/15
JP	Japan	1918/1/1
LV	Latvia	1915/1/1
LT	Lithuania	1915/1/1
LU	Luxemburg	1582/12/15
NL	Netherlands	1582/10/15	Catholic regions transitioned generally between 1582 and 1583, while Protestant transitioned between 1700 and 1701
NO	Norway	1700/3/1
PL	Poland	1582/10/15
PT	Portugal	1582/10/15
RO	Romania	1919/4/14
ES	Spain	1582/10/15
SE	Sweden	1753/3/1	Sweden actually had a long, complicated, and difficult transition. This date is a large oversimplification.
CH	Switzerland	1584/1/22	Actual date varied between 1584 and 1701 by Canton
TR	Turkey	1927/1/1
YU	Yugoslavia	1919/1/1
UK	Great Britain and Dominions	1752/9/14
US	United States	1752/9/14	Transitioned with the rest of the British colonies at the time
SU	former Soviet Union	1918/2/1
RU	Russia	1918/2/1