Its associated molad Adam (molad Va Ya D) occurred on Day 5 (yom Vav) at 14 (Yud Daled) hours (and 0 parts).
A year earlier, the first day of AM 1, Rosh Hashanah (1 Tishrei), is associated with molad tohu (new moon of chaos), so named because it occurred before Creation when everything was still chaotic — it is also translated as the new moon of nothing.
He [the questioner] thought that Rav Nahman wanted to dispose of him anyhow, but when he went and studied it thoroughly he found that it is indeed taught [in a Baraita]: In the Diaspora the Greek Era alone is used. In the 8th and 9th centuries AD, the center of Jewish life moved from Babylonia to Europe, so calculations from the Seleucid era "became meaningless".being the number of years since the AD 70 destruction of the Second Temple, and the number of years since the Creation year based on the calculation in the Seder Olam Rabbah of Rabbi Jose ben Halafta in about AD 160. The new system reached its definitive form in AD 1178 when Maimonides completed the Mishneh Torah.The Septuagint was the most scholarly non-Hebrew version of the Old Testament available to early Christians.Many converts already spoke Greek, and it was readily adopted as the preferred vernacular-language rendering for the eastern Roman Empire.All these events happened, according to the Alexandrian chronology, on the 25th of March; furthermore, the first two events were separated by the period of exactly 5500 years; the first and the third one occurred on Sunday — the sacred day of the beginning of the Creation and its renovation through Christ.
March 25 was considered to be the anniversary of Creation itself.
The Alexandrian era, arising in AD 412, was the precursor to the Byzantine era.
After the initial attempts by Hippolytus, Clement of Alexandria and others, the Alexandrian computation of the date of creation was worked out to be 25 March 5493 BC.
In the section Sanctification of the Moon (11.16), he wrote of his choice of Epoch, from which calculations of all dates should be made, as "the third day of Nisan in this present year ...
which is the year 4938 of the creation of the world" (March 22, AD 1178).
The net difference between the two major genealogies of Genesis is 1466 years (ignoring the "second year after the flood" ambiguity), 85% of the total difference.