# Install hebcal with Homebrew, apt, Nix Perpetual Jewish calendar for the command-line. Version 5.13.0 via Homebrew; verified 2026-07-07. ## Install ```sh sudo av install brew:hebcal ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install hebcal ``` Evidence: local Homebrew formula metadata ### Linux - Debian apt (92%): ```sh sudo apt install hebcal ``` Evidence: Debian stable package indexes: hebcal from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - Nix (92%): ```sh nix profile install nixpkgs#hebcal ``` Evidence: nixpkgs package indexes: pkgs/by-name/he/hebcal/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 ## Package facts - **Package key:** brew:hebcal - **Package manager:** Homebrew - **Package manager page:** - **Version:** 5.13.0 - **Source summary:** Perpetual Jewish calendar for the command-line - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** GPL-2.0-or-later - **Source archive:** - **Last updated:** 2026-07-07T16:39:18Z - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - hebcal (cli) - hebcal (alias) ## Build dependencies - go ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux ## Freshness - Page generated: 2026-07-08 - Package-manager version: 5.13.0 - Package-manager updated: 2026-07-07 - Local data: ok - Upstream repository: https://github.com/hebcal/hebcal - Upstream latest detected: v5.13.0 (current) ## Project history and usage hebcal is a command-line perpetual Jewish calendar. It prints Hebrew dates, holidays, weekly Torah portions, Omer counts, candle-lighting and Havdalah times, daily learning schedules, and related calendar data for scripted or terminal use. ### Project history The README credits Danny Sadinoff as the original author, with portions by Michael J. Radwin and later contributions for JavaScript, Daf Yomi, Molad, and sunrise/sunset features. It describes Hebcal as a flexible program for printing Jewish calendar events for a given secular or Hebrew year, month, day, or ISO date. The README records that version 3 rewrote much of the program using the Emacs 19 calendar routines by Edward M. Reingold and Nachum Dershowitz, tying the Unix CLI to a wider lineage of calendrical computation rather than a single-purpose holiday table. GitHub repository metadata records the public hosted project from July 2013. ### Adoption history Hebcal occupies the classic Unix utility niche: a domain-specific calendar program that can print plain text, tab-delimited output, localized event names, and date ranges for shell scripts or human reading. The input package facts record packaging in Homebrew, Debian, Ubuntu, and Nix, suggesting sustained use by command-line users who want Jewish calendar data outside a web app. ### How it is used The CLI accepts a year, month/day/year, Hebrew month/year, or ISO date and can selectively enable or suppress Hebrew dates, holidays, sedrot, Omer counts, modern Israeli holidays, candle-lighting, Havdalah, zmanim, and daily learning schedules. Its environment support includes `HEBCAL_CITY` for default candle-lighting geography and `HEBCAL_OPTS` for repeated command options. ### Why package nerds care For package nerds, Hebcal is a good example of a small culturally specific Unix tool that remains valuable because it is composable. It turns calendrical rules, local sunset calculations, transliteration choices, and recurring study cycles into predictable command output that can be piped, scripted, cron-run, or wrapped by other calendar systems. ### Timeline - Version 3 era: The README says much of Hebcal was rewritten using Emacs 19 calendar routines by Reingold and Dershowitz. - 2013: GitHub repository metadata records the hosted Hebcal source repository. - Package-manager era: The input package facts record Hebcal in Homebrew, Debian, Ubuntu, and Nix packaging. ### Related projects - The README explicitly points to `calendar(1)`, Emacs calendar, hcal, hdate, omer, remind, and rise as related command-line or calendar tools. Algorithmically it is related to the calendrical work of Edward M. Reingold and Nachum Dershowitz. ### Sources - - - ## Security Notes narrow executable package without higher-risk signals. - **Geiger risk:** green / low - narrow executable package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** hebcal - **Version Scheme:** 0 - **Revision:** 0 - **Head Version:** HEAD - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** head, stable ## Other Package-Manager Records - Debian apt - hebcal - 4.31-1: normalized package name match | Debian stable package indexes: hebcal from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Perpetual Jewish Calendar | https://github.com/hebcal/hebcal - Nix - hebcal: normalized package name match | nixpkgs package indexes: pkgs/by-name/he/hebcal/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Ubuntu apt - hebcal - 4.31-1: normalized package name match | Ubuntu 24.04 LTS package indexes: hebcal from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Perpetual Jewish Calendar | https://github.com/hebcal/hebcal ## Related links - [Source-control packages](https://www.automicvault.com/pkg/source-control-tools/) - Belongs to a source-control command family. - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Networking and protocol packages](https://www.automicvault.com/pkg/networking-protocol-tools/) - Matched network, protocol, or remote-service metadata. - [Productivity CLI packages](https://www.automicvault.com/pkg/productivity-cli-packages/) - Matched curated productivity category metadata from av.db. - [go](https://www.automicvault.com/pkg/brew/go/) - Build dependency declared by Homebrew. - [calcurse](https://www.automicvault.com/pkg/brew/calcurse/) - Shares av.db curated category or tags: calendar, cli, productivity. - [ccal](https://www.automicvault.com/pkg/brew/ccal/) - Shares av.db curated category or tags: calendar, cli, productivity. - [ddate](https://www.automicvault.com/pkg/brew/ddate/) - Shares av.db curated category or tags: calendar, cli, productivity. - [gcalcli](https://www.automicvault.com/pkg/brew/gcalcli/) - Shares av.db curated category or tags: calendar, cli, productivity. - [ical-buddy](https://www.automicvault.com/pkg/brew/ical-buddy/) - Shares av.db curated category or tags: calendar, cli, productivity. - [jcal](https://www.automicvault.com/pkg/brew/jcal/) - Shares av.db curated category or tags: calendar, cli, productivity. - [khal](https://www.automicvault.com/pkg/brew/khal/) - Shares av.db curated category or tags: calendar, cli, productivity. - [pcal](https://www.automicvault.com/pkg/brew/pcal/) - Shares av.db curated category or tags: calendar, cli, productivity. ## Combined YAML source View the package source record on GitHub. [combined/hebcal.yml](https://github.com/automic-vault/db/blob/main/combined/hebcal.yml) ## Sources - Nucleus package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - av.db category and tag curation - package relationship graph - external package-manager database matches - cross-ecosystem install command graph