Regarding the beginning of the
Zoroastrian era, in one of His Tablets 'Abdu'l-Bahá states that Zoroaster lived
about 750 years after Moses. In a letter to an individual believer the
Guardian's secretary wrote on his behalf: "Zoroaster lived about a thousand
years before Christ. There is no exact date in the teachings regarding the
beginning of His Dispensation."
(From a letter dated 13 May 1979 written
on behalf of the Universal House of Justice to an individual believer)