Page "Hangul Day" Paragraph 3

The discovery in 1940 of an original copy of the Hunmin Jeongeum Haerye, a volume of commentary to the Hunmin Jeongeum that appeared not long after the document it commented upon, revealed that the Hunmin Jeongeum was announced during the first ten days ( sangsun ; 상순 ; 上旬 ) of the ninth month.

The tenth day of the ninth month of 1446 of the lunar calendar in 1446 was equivalent to October 9 of the Julian calendar.

After the South Korean government was established in 1945, Hangul Day was declared as a legal holiday to be marked on October 9, on which governmental workers are excused from work.