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Jewish calendar
How Hebrew dates, months, holidays and annual recurrence fit together.
A clear starting point
The Jewish calendar turns memory into repeated action. Dates are not only information: they tell a family when to prepare, gather, remember, celebrate or mark a transition.
Three ideas to keep
What to do now
- 01Collect the correct names, dates and sunset information.
- 02Verify the Hebrew-date calculation before saving it.
- 03Set the first reminder early enough to prepare, not on the date itself.
Source lineage
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The page separates the canonical reference, the commentary and OJS interpretation so the reader can see where each conclusion begins.
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Book of Prophets with Rashi’s commentary · late 13th century · public-domain reproduction.
Sources to open
Exodus 12:2
The first month
The Jewish calendar is connected to collective memory and command.
Genesis 1:14
Lights for times
Sun and moon mark days and appointed times.
Mishnah Rosh Hashanah 1:1
Several new years
Rabbinic time contains different cycles for different purposes.
Date calculations must be deterministic and verified. An LLM should not decide Hebrew dates or religious obligations.