Heavenly calendar in Korean

Below is about Heavenly calendar in Korean.

K.Kambashi

Dear families, 

Regarding the names of the months in the heavenly calender, it says in Korean

1월, 2월, 3월, 4월, 5월, 6월, 7월, 8월, 9월, 10월, 11월, 12월.

월(Wol) means 'month' and its Chinese character is 月. If I spell the numbers in Korea, it is 

일월, 이월, 삼월, 사월, 오월, 유월(not 육월), 칠월, 팔월, 구월, 시월 (not 십월), 십일월, 십이월

I remember this year we have 13months and we had 3월 twice. But I don't know the rules regarding which month we have twice when we have 13 months a year.

If it is the ninth day of the sixth month by the heavenly calendar in the 3rd year of Cheongi, in Korean it is

천기 3년 6월 9일  (Cheongi Samnyeon Yoowol Gooil) 

년 (nyeon) means "year." 일 (il) means 'day.'

Our Foundation Day is

천기 4년 1월 13일 (Cheongi Sanyeon Ilwol Shibsamil)