The first day (the Creation) of the Hebrew calendar, a lunisolar calendar used today predominantly for Jewish religious observances, corresponds to September 25, 3760 BCE.

The Jewish calendar's epoch (reference date), 1 Tishrei 1 AM, is equivalent to Monday, October 7, 3761 BCE in the proleptic Julian calendar, the equivalent tabular date (same daylight period).

It is about one year before the traditional Jewish date of Creation on 25 Elul AM 1, based upon the Seder Olam Rabbah of Rabbi Yossi ben Halafta, a sage of the second century CE.

Thus, adding 3760 before Rosh Hashanah or 3761 after to a Julian or Gregorian year number after 1 CE will yield the Hebrew year.