Dear Jamshid:
Thanks you for your comments.
As you know, the Shehnshai/Kadmi Zarathushtrian calendars are vague year alendars – of 365 days a year, without any intercalation. As a result, the Zarathushtrian year falls back by approximately one day every four years. Thus it would take approximately ,460 (365 x 4) Julian years for the Zarathushtrian calendar to fall back by one full year. In other words, in 1460 Julian years there would be 1461 Shehnshai/Kadmi years.
So, if we take the start of the current Zoroastrian era (the coronation of Yezdigard III) as the starting point (Navroz day, June 16, 631 CE-Julian) then in approximately 2091 CE (631 + 1460), the Yezdigard era would be 1461 AY. In other words, it would take one full cycle for an extra year to be added to the Yezdigard era. (Please note that the calculations are not precise – but approximate.)
I thus believe that the correct AY year (for the current Zarathushtrian year ending in August 2004 CE) is 1371.
With respect to uses of eras in determining the chronology for Zarathushtrian use, you are quite correct in that Zadspram mentioned that “In the forty-seventh year Zartosht passes away, who attains seventy-seven years and forty days in the month Ardwahisht, on the day Khur, …” Zadspram was referring to incidents that took place with reference to the life of Zarathushtra, so it is quite permissible for him to use, as the applicable epoch for that era, the revelation of Zarathushtra. There is no indication that in Zadparm’s time that all Zoroastrian chronology was based on the revelation of Zarathushtra as the epoch.. If there had been this continued use, upto Zadspram's time, we would not have all this confusion. Historically, it appears, that the system has always been based on each era starting with the coronation of a new emperor. Al Biruni, in his Chronology of Ancient Nations, attests to this fact.
Permit me to also quote from the Greater Bundahisn (Chapter XXXVI):
CHAPTER XXXVI
0. As regards the [Taji] year reckoning of time, of twelve thousand years.
1. One says in the Scripture, "For three thousand years, there was the spiritual state, that is, the creatures were unthinking, unmoving, and intangible; [the lords of the millennia were Aries, Taurus, and Gemini.]
2. For three thousand years Gayomard with the 'gav' was in the material state with antagonism; and the lords of the millennia were Cancer, Leo, and Virgo, so that it became six thousand years.
3. When the rule of the millennium came to Libra, the adversary entered, and Gayomard lived thirty years in the adverse state. 4. Then Mashye and Mashyane grew up for forty years, and it was for fifty years that they did not live as wife and husband. For ninety-three years [and six months] they lived together as wife and husband, till the time when [307] Hooshang attained [to full age.]
5. Hooshang ruled forty years, Tahmurasp thirty years, Jam {Jamshed} ruled six hundred and sixteen years and six months, till the glory {khwarrah} departed [from him,] and after that he was in flight for [a] hundred years, [in all, it is seven hundred and sixteen years and six months.
6. And] then the rule of the millennium came to Scorpio, and Dahak {Zohak} [reigned] a thousand years.
7. Then the rule of the millennium came to Sagittarius; Faridoon [reigned] five hundred years; in these five hundred years of Faridoon, Airij reigned twelve years; Manushchihr reigned a hundred and twenty years; during this reign of Manushchihr, when he was in Mount Patashkhvar, Frasiyav reigned twelve years, Uzob son of Tuhmasp reigned five years, and Kay Kobad fifteen years; [the rule of Sam was during those of Uzob, Kobad, and Manushchihr.] Kay Kaus reigned seventy-five years till his going to the sky, and seventy-five years after that, altogether a hundred and fifty years. Kay Khosraw reigned sixty years; Kay Lohrasp a hundred and twenty years; Kay Vishtasp reigned thirty years till the coming of the Revelation; [approximately one thousand years.
8. Then the rule of the millennium came to Capricornus, and Zartosht of Spitama came for prophecy from the creator Ohrmazd to King Vishtasp. 9. King Vishtasp reigned ninety years after receiving the Revelation {Den},] altogether a hundred and twenty years. Vohuman son of Spend-dat reigned a hundred and twelve years; Humay daughter of Vohuman thirty years; Daray {Darius} son of Chihr-azat, that is Vohuman, twelve years; Daray son of Daray, fourteen years; Alexander the Aruman, fourteen years; the Ashkanians, who bear the name for righteous rule, reigned two hundred and eighty-four years thereafter. Ardashir son of Babag, and the Sasanians reigned four hundred and sixty years in this reckoning; [till the brood of the Tajis {Arabs} gained the position up to the Parsik year four hundred and forty-seven.
10. At present it is the Parsik year five hundred and twenty-seven.]
While the revelation of Zarathushtra is mentioned in paragraph 7, there is no mention of that being the epoch of a new calendar.
Note also that the last paragraph (#10) states that the year (in which the Bundahisn was written) is 527 Parsik.
There is no mention of any ZRE being used in any of this chronology.
Permit me to add, that if the ZRE were a historical fact, there would be no need for the debate (regarding the date of Zarathusthra) to rage on and on. Most recently Gherardo Gnoli, who had initially put Zarathushtra at about 1000 BC, has joined Professors Gershevitch and Henning, in accepting the “Traditional” dating of Zarathushtra, at 258 years before Alexander.
If only our ancestors had maintained a true era starting with the birth or epiphany of Zarathushtra, as the epoch, we would not be in this dilemma. The important point is we just do not know, with any degree of certainty, the date of Zarathushtra.
In conclusion, I maintain that the ZRE is a fabrication of one individual’s imagination. There is no historical record in the Zoroastrian literature that it ever existed.
We are already confused by having 3 Zarathushtrian calendars, let’s not further confuse ourselves by starting a new era, for which we do not even have any definitive proof. This is how we complicate our own history for the future generations.
With best wishes,
Sarosh