Korean-Chinese Lunar Calendar Difference

Posted by Wesley on
In the light of the upcoming Chinese lunar calendar support in iOS 8, I've cross-compared the Korean and Chinese lunar calendar data to see where exactly the two calendars differ. The chart below shows the result.

The difference mostly happens one lunar month at a time, during which the Korean lunar calendar trails the Chinese by one day. 2012 had a special case where the lunar month became different, as the Korean one had a leap third month while the Chinese one had a leap fourth month.

The chart covers all dates between 1901 and 2050 by the Gregorian (regular Western) calendar.

If you want to add this information to your calendar, use the following URL:
Lunar Calendar Difference ICS file

Download the ICS file and open up in your calendar app. If you're using Google Calendar, right-click and copy the URL first. Then on the "Other calendars" menu on the left side of the Google Calendar, click the drop-down button on the right and select "Add by URL". You can paste the URL there to add the calendar.

Gregorian Korean Leap Chinese Leap Gregorian Korean Leap Chinese Leap
1914-06-23 1914-05-30 X
 1914-05-01 O 1973-01-04 ~ 1973-02-02 1972-11-30 ~ 1972-12-29 X 1972-12-01 ~ 1972-12-30 X
1914-06-24 ~ 1914-07-22 1914-05-01 ~ 1914-05-29 O 1914-05-02 ~ 1914-05-30 O 1973-12-24 ~ 1974-01-22 1973-11-30 ~ 1973-12-29 X 1973-12-01 ~ 1973-12-30 X
1914-11-17 ~ 1914-12-16 1914-09-30 ~ 1914-10-29 X 1914-10-01 ~ 1914-10-30 X 1976-11-21 ~ 1976-12-20 1976-09-30 ~ 1976-10-29 X 1976-10-01 ~ 1976-10-30 X
1916-02-03 ~ 1916-03-03 1915-12-30 ~ 1916-01-29 X 1916-01-01 ~ 1916-01-30 X 1978-04-07 ~ 1978-05-06 1978-02-30 ~ 1978-03-29 X 1978-03-01 ~ 1978-03-30 X
1918-12-03 ~ 1919-01-01 1918-10-30 ~ 1918-11-29 X 1918-11-01 ~ 1918-11-30 X 1982-11-15 ~ 1982-12-14 1982-09-30 ~ 1982-10-29 X 1982-10-01 ~ 1982-10-30 X
1919-08-25 1919-07-30 X 1919-07-01 O 1987-05-27 ~ 1987-06-25 1987-04-30 ~ 1987-05-29 X 1987-05-01 ~ 1987-05-30 X
1919-08-26 ~ 1919-09-23 1919-07-01 ~ 1919-07-29 O 1919-07-02 ~ 1919-07-30 O 1989-10-29 ~ 1989-11-27 1989-09-30 ~ 1989-10-29 X 1989-10-01 ~ 1989-10-30 X
1919-11-22 ~ 1919-12-21 1919-09-30 ~ 1919-10-29 X 1919-10-01 ~ 1919-10-30 X 1990-10-18 ~ 1990-11-16 1990-08-30 ~ 1990-09-29 X 1990-09-01 ~ 1990-09-30 X
1920-11-10 ~ 1920-12-09 1920-09-30 ~ 1920-10-29 X 1920-10-01 ~ 1920-10-30 X 1995-07-27 ~ 1995-08-25 1995-06-30 ~ 1995-07-29 X 1995-07-01 ~ 1995-07-30 X
1923-11-08 ~ 1923-12-07 1923-09-30 ~ 1923-10-29 X 1923-10-01 ~ 1923-10-30 X 1995-11-22 ~ 1995-12-21 1995-09-30 ~ 1995-10-29 X 1995-10-01 ~ 1995-10-30 X
1924-03-05 ~ 1924-04-03 1924-01-30 ~ 1924-02-29 X 1924-02-01 ~ 1924-02-30 X 1997-02-07 ~ 1997-03-08 1996-12-30 ~ 1997-01-29 X 1997-01-01 ~ 1997-01-30 X
1925-05-22 1925-04-30 X 1925-04-01 O 1999-01-17 ~ 1999-02-15 1998-11-30 ~ 1998-12-29 X 1998-12-01 ~ 1998-12-30 X
1925-05-23 ~ 1925-06-20 1925-04-01 ~ 1925-04-29 O 1925-04-02 ~ 1925-04-30 O 2001-04-23 ~ 2001-05-22 2001-03-30 ~ 2001-04-29 X 2001-04-01 ~ 2001-04-30 X
1927-10-25 ~ 1927-11-23 1927-09-30 ~ 1927-10-29 X 1927-10-01 ~ 1927-10-30 X 2005-12-01 ~ 2005-12-30 2005-10-30 ~ 2005-11-29 X 2005-11-01 ~ 2005-11-30 X
1928-10-13 ~ 1928-11-11 1928-08-30 ~ 1928-09-29 X 1928-09-01 ~ 1928-09-30 X 2012-04-21 ~ 2012-05-20 2012-03-01 ~ 2012-03-30 O 2012-04-01 ~ 2012-04-30 X
1931-05-17 ~ 1931-06-15 1931-03-30 ~ 1931-04-29 X 1931-04-01 ~ 1931-04-30 X 2012-05-21 ~ 2012-06-18 2012-04-01 ~ 2012-04-29 X 2012-04-01 ~ 2012-04-29 O
1934-10-08 ~ 1934-11-06 1934-08-30 ~ 1934-09-29 X 1934-09-01 ~ 1934-09-30 X 2012-06-19 ~ 2012-07-18 2012-04-30 ~ 2012-05-29 X 2012-05-01 ~ 2012-05-30 X
1936-07-18 ~ 1936-08-16 1936-05-30 ~ 1936-06-29 X 1936-06-01 ~ 1936-06-30 X 2012-08-17 ~ 2012-09-15 2012-06-30 ~ 2012-07-29 X 2012-07-01 ~ 2012-07-30 X
1942-09-10 ~ 1942-10-09 1942-07-30 ~ 1942-08-29 X 1942-08-01 ~ 1942-08-30 X 2013-06-08 ~ 2013-07-07 2013-04-30 ~ 2013-05-29 X 2013-05-01 ~ 2013-05-30 X
1942-11-08 ~ 1942-12-07 1942-09-30 ~ 1942-10-29 X 1942-10-01 ~ 1942-10-30 X 2019-11-26 ~ 2019-12-25 2019-10-30 ~ 2019-11-29 X 2019-11-01 ~ 2019-11-30 X
1943-11-27 ~ 1943-12-26 1943-10-30 ~ 1943-11-29 X 1943-11-01 ~ 1943-11-30 X 2020-02-23 ~ 2020-03-23 2020-01-30 ~ 2020-02-29 X 2020-02-01 ~ 2020-02-30 X
1944-01-25 ~ 1944-02-23 1943-12-30 ~ 1944-01-29 X 1944-01-01 ~ 1944-01-30 X 2023-05-19 ~ 2023-06-17 2023-03-30 ~ 2023-04-29 X 2023-04-01 ~ 2023-04-30 X
1949-03-29 ~ 1949-04-27 1949-02-30 ~ 1949-03-29 X 1949-03-01 ~ 1949-03-30 X 2026-10-10 ~ 2026-11-08 2026-08-30 ~ 2026-09-29 X 2026-09-01 ~ 2026-09-30 X
1950-03-18 ~ 1950-04-16 1950-01-30 ~ 1950-02-29 X 1950-02-01 ~ 1950-02-30 X 2027-02-06 ~ 2027-03-07 2026-12-30 ~ 2027-01-29 X 2027-01-01 ~ 2027-01-30 X
1950-06-15 ~ 1950-07-14 1950-04-30 ~ 1950-05-29 X 1950-05-01 ~ 1950-05-30 X 2028-01-26 ~ 2028-02-24 2027-12-30 ~ 2028-01-29 X 2028-01-01 ~ 2028-01-30 X
1952-08-20 ~ 1952-09-18 1952-06-30 ~ 1952-07-29 X 1952-07-01 ~ 1952-07-30 X 2029-07-11 ~ 2029-08-09 2029-05-30 ~ 2029-06-29 X 2029-06-01 ~ 2029-06-30 X
1954-02-03 ~ 1954-03-04 1953-12-30 ~ 1954-01-29 X 1954-01-01 ~ 1954-01-30 X 2031-02-21 ~ 2031-03-22 2031-01-30 ~ 2031-02-29 X 2031-02-01 ~ 2031-02-30 X
1955-02-22 ~ 1955-03-23 1955-01-30 ~ 1955-02-29 X 1955-02-01 ~ 1955-02-30 X 2035-01-09 ~ 2035-02-07 2034-11-30 ~ 2034-12-29 X 2034-12-01 ~ 2034-12-30 X
1958-02-18 ~ 1958-03-19 1957-12-30 ~ 1958-01-29 X 1958-01-01 ~ 1958-01-30 X 2036-12-17 ~ 2037-01-15 2036-10-30 ~ 2036-11-29 X 2036-11-01 ~ 2036-11-30 X
1966-01-21 ~ 1966-02-19 1965-12-30 ~ 1966-01-29 X 1966-01-01 ~ 1966-01-30 X 2040-09-06 ~ 2040-10-05 2040-07-30 ~ 2040-08-29 X 2040-08-01 ~ 2040-08-30 X
1968-04-27 ~ 1968-05-26 1968-03-30 ~ 1968-04-29 X 1968-04-01 ~ 1968-04-30 X 2041-03-02 ~ 2041-03-31 2041-01-30 ~ 2041-02-29 X 2041-02-01 ~ 2041-02-30 X
1970-07-03 ~ 1970-08-01 1970-05-30 ~ 1970-06-29 X 1970-06-01 ~ 1970-06-30 X 2046-06-04 ~ 2046-07-03 2046-04-30 ~ 2046-05-29 X 2046-05-01 ~ 2046-05-30 X
2050-02-21 ~ 2050-03-22 2050-01-30 ~ 2050-02-29 X 2050-02-01 ~ 2050-02-30 X

Calendar data compared were from:
Korean: Korea Astronomy & Space Information
Chinese: Hong Kong Observatory
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anonymous on :

Awesome! Thanks!

Kevin on :

Very cool. Thanks for the info, and the calendar.

If I install this, does it also add an option to select the Korean Lunar Calendar (instead of the Chinese one) when inputting birthdays to a contact?

Wesley on :

Unfortunately not.

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