Missing years (Jewish calendar)

 https://en.wikipedia.org/wiki/Missing_years_(Jewish_calendar)#:~:text=The%20traditional%20Jewish%20date%20recognized,as%20the%20"missing%20years".

It has also been posited that certain calculations in the Talmud compute better according to the academic dating. Two possible harmonizations are proposed by modern rabbis:

Shimon Schwab points to the words "seal the words and close the book" in the book of Daniel as a positive commandment to obscure the calculations for the Messiah mentioned within, so that the true date of the Messiah's arrival would not be known.[28] However, Schwab later withdrew this suggestion for numerous reasons.[23]: 281-285  [24]: 66–67  [25]: 67–68, 93 

An alternative solution suggests that the sages were concerned with the acceptance of the Mishnah. There existed a rabbinical tradition that the year 4000 marked the close of the "era of Torah". The authors of the Ḥakirah article propose that the sages therefore arranged the chronology so that the redaction of the Mishnah should coincide with that date and thus have a better chance of acceptance.[25]: 67–115