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The Official Birth Date of Ahn Sahng-hong, Leader of the Church of God, Is January 13, 1918 (Gregorian Calendar).

However, according to the Seventh-day Adventist Church membership records, Ahn Sahng-hong's birth year is recorded as January 13, 1917. The record indicates that Ahn Sahng-hong’s birth date is "January 13 in the year of Dangi 4250." When converted to the Gregorian calendar, Dangi 4250 corresponds to 1917 because the Dangi calendar begins with BC 2333 as its starting point. Hence, Dangi 4250 equals 2333 + 1917 = 4250. This indicates that Ahn Sahng-hong recognized his birth year as 1917. 

Furthermore, Ahn Sahng-hong's gravestone lists his birth date as December 1, 1918, according to the lunar calendar. When converted, January 13, 1918 (Gregorian calendar) corresponds to December 1, 1917 (lunar calendar). However, it seems there was a mistake when engraving the gravestone.

As a result, Ahn Sahng-hong has three different recorded birth dates. It is astonishing that someone who claimed to be God was uncertain about his own birth year.

The Three Recorded Birth Dates of Ahn Sahng-hong:

1. Officially Known Birth Date: January 13, 1918 (Gregorian calendar)
2. Seventh-day Adventist Church Membership Record: January 13, 1917
3. Ahn Sahng-hong’s Gravestone: December 1, 1918 (lunar calendar)