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About Jewish Calendar Tools

JewishCalendarTools.com was created to provide clear, reliable, and accessible Jewish calendar calculation tools for people worldwide. Whether you are looking up Friday candle lighting times, finding a Hebrew birthday, planning a Bar or Bat Mitzvah, or calculating a Yahrzeit memorial date, our goal is to make complex lunisolar calendar information simple and immediate.

Our Mission

The Jewish calendar is a rich lunisolar system with centuries of tradition, astronomical logic, and detailed community customs. However, navigating sunset boundaries, leap year additions, and time zone offsets can often feel confusing.

We built JewishCalendarTools.com around four core commitments:

  • Simplicity and Speed: Provide clean, mobile-friendly calculators that deliver clear answers instantly without unnecessary clutter or complex forms.
  • Calculation Transparency: Show the active calculation settings, time zones, and methods used alongside every result so users always understand where numbers come from.
  • Privacy First: Perform calculations statelessly in the browser without requiring user accounts, passwords, or personal data storage.
  • Free Public Access: Keep all core tools freely accessible to individuals, families, synagogues, and communities everywhere.

How the Site Is Supported

JewishCalendarTools.com is independent and free to use. To maintain server infrastructure, domain costs, and ongoing development, the site is designed to be supported by unobtrusive online advertising after launch. Advertising revenue allows us to keep all six core calculation tools completely free without imposing subscriptions, paywalls, or feature restrictions.

Technical Foundation and Accuracy

Our calculators are built on audited open source software libraries and established astronomical standards. We rely on the tested @hebcal/core Jewish calendar library (GPL-2.0) for Hebrew date conversions and holiday algorithms, combined with National Oceanic and Atmospheric Administration (NOAA) solar positioning formulas and official IANA time zone data for location-specific Shabbat times.

To review our complete technical framework and data sources, visit our calculation methodology page and inspect our data sources documentation.

Religious Disclaimer and Rabbinic Guidance

JewishCalendarTools.com is a computational and educational web resource, not a rabbinic court or halachic authority. While our algorithms reflect standard established customs (such as 18-minute Diaspora candle lighting and astronomical nightfall), local traditions and individual circumstances can vary.

For binding religious rulings, personal observance decisions, or complex edge cases, we advise visitors to consult a qualified Orthodox rabbi or local spiritual authority.

Get in Touch

We welcome feedback, suggestions, and technical inquiries from users, educators, and rabbis. If you notice a location discrepancy or have a feature request: