Consequently, a person's age may be calculated incorrectly if it is based on the traditional Japanese system; in order to avoid this, the Christian era year that has been derived based on January 1st on the Japanese calendar should be used when calculating a person's date of birth and death.
そのため、和暦の元日から換算した西暦の年を、その和暦の西暦の年として生没年を計算しないと、誤った数え年が計算されるおそれがある。