Two calendar "starts": Religious year begins Nisan 1 (spring) — Exodus 12:2 establishes this as "the first month." Civil year begins Tishrei 1 (autumn) — this became Rosh Hashanah, the more commonly cited "Jewish New Year" today. A day runs evening to evening ("there was evening and there was morning" — Genesis 1), not midnight to midnight. One caveat worth flagging: the exact mechanics (when leap months were added, whether it was observation-based or calculated) shifted over the biblical and post-biblical periods. The fixed mathematical version Jews use today was formalized by Hillel II in the 4th century AD — so even "the biblical calendar" isn't a single static system across all of Scripture's timespan.
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