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If there was a calendar shift, the destructions would have taken place in our years 33 AM, or in 33 AM, and the Common Era equivalents would be 422 BCE and 69 CE, respectively, or 421 BCE and 70 CE.If there was no calendar shift, the length of the missing-years period would be 163 years (586 minus 423).The 2nd century CE rabbinic work Seder Olam Rabbah, which formed the basis of the era counting of the Hebrew calendar, interpreted the prophecy of seventy weeks in Daniel –27 as referring to a period of 490 years, with a "week" being interpreted as a period of seven years, which would pass between the destruction of the First and Second Temple.
On the second day of the month of Adar (16 March) he conquered the city and took the king (Jeconiah) prisoner.
However, Seder Olam Rabba shows that the Hebrew dating originally counted the first year of Adam's life as "Year Zero" AM.
This may mean that the Hebrew dating has shifted in the course of history such that traditional dating of ancient events appears two years earlier than the modern Hebrew dating would be (Edgar Frank, Talmudic and Rabbinic Chronology, 1956).
The understanding of this number as referring to 490 years can also be found in Seder Olam.
Christians also interpreted these verses as years and connect them to Jesus, although Rashi's interpretation is such that it upholds the tradition that the anointed one in question is the Persian king Cyrus.