Feasts, Scripture-dated events, and Hebrew months - mapped across the year. Click any highlighted day to see what happened, why it matters, and where it points in the story of redemption.
In Scripture, months began when two witnesses confirmed the sighting of the new crescent moon over Jerusalem (Rosh Chodesh). The Sanhedrin would hear their testimony and declare the new month. Feasts were observed from that declaration, and whether to add a thirteenth month depended on the state of the barley harvest (aviv). The calendar was observational - anchored to the moon in the sky and the grain in the field.
The dates on this page use the Hillel II fixed calendar, standardized around 359 AD, which replaced observation with mathematical rules. It follows a 19-year leap cycle and calculates month lengths arithmetically. This is the calendar used by Jewish communities worldwide and by virtually every Hebrew date resource available today.
The fixed calendar is usually accurate to within a day of where actual lunar observation would place the date, but it can differ - and that difference matters most for the Feast of Trumpets (Yom Teruah, Leviticus 23:24), which falls on the first of Tishri. Because it is the only feast that falls on Rosh Chodesh itself, the day literally could not begin until the new moon was sighted. Rabbinic tradition calls it "the feast that no man knows the day or the hour" for exactly this reason.
The biblical day begins at evening, not midnight. Genesis 1:5 establishes the pattern from creation itself - "there was evening and there was morning, the first day" - and Leviticus 23:32 gives the direct command: "from evening to evening shall you celebrate your Sabbath." The Hebrew word for evening, erev (עֶרֶב), means "mixing" - the mixing of light and darkness at twilight. Sunset marks the beginning of that transition, and it is the point used here to determine when the Hebrew date changes.
Sunset times are calculated for Jerusalem using a solar position algorithm and are approximate. Because erev describes a period rather than a precise second, and because Jewish tradition has debated whether the new day begins at sunset or at the appearance of three stars shortly after, the times shown should be understood as close markers, not exact boundaries. Your local time equivalent is shown alongside for reference.
This tool is meant to help you see how Scripture's dates connect across the whole story. Use it as a study aid, not as a liturgical authority.