Hebcal MCP: Hebrew dates, holidays and Shabbat times

Convert dates between the Hebrew and Gregorian calendars, list a year's Jewish holidays, and get Shabbat candle-lighting and Havdalah times for your location, straight from your AI app. Hebcal's MCP server is public, so ContextGate lists its seven tools without a sign-in, lets you switch off any of them and logs each calculation.

  • Ready to connect
  • Free
  • 7 example tools

Connect Hebcal to Claude, ChatGPT or Cursor

  1. 1Click Connect Hebcal free. There's no sign-in, so its tools are ready at once.
  2. 2All seven tools are calculators: they convert dates and work out times and readings, and change nothing. Keep them all, or switch off ones you won't use, such as `daf-yomi`.
  3. 3Add ContextGate to your AI app as a connector or MCP server. The steps for each app are on the Works with page.
  4. 4Ask your AI app for this Friday's candle-lighting time in your city, then open Activity to see the `shabbat-times` call.

Jewish calendar answers from Hebcal

  • Convert a Gregorian date to a Hebrew date, or back, with `convert-gregorian-to-hebrew` and `convert-hebrew-to-gregorian`.
  • Get candle-lighting and Havdalah times for a location and date range with `shabbat-times`.
  • Find the weekly Torah portion for a date via `torah-portion`, or list a year's Jewish holidays.
  • Work out a Yahrzeit date on the Hebrew calendar with `yahrzeit`.

Simple controls for a public calendar

  • Switch off any Hebcal tool; it's hidden from your AI app and refused if called.
  • Activity keeps a record of each date conversion and time lookup.

What you get with Hebcal and ContextGate

  • Your AI apps can use HebcalClaude, Cursor, ChatGPT and other AI apps reach Hebcal through the one ContextGate connection you add to them.
  • You choose which tools they can useSwitch off any Hebcal tool you don't want used. It's hidden from your AI apps and refused if called.
  • Every call is checked and recordedYour policies check each call (for example, personal data is hidden and secrets are blocked), and Activity keeps a record of it.

ContextGate sees only the tool calls that go through it, not your AI app's built-in tools or your chats.

Hebcal tools

Examples of what your AI apps can do in Hebcal. You'll see the exact list of tools after you connect it.