# Install cctz with Homebrew, apt, dnf, Nix C++ library for translating between absolute and civil times. Version 2.5 via Homebrew; verified from local package data. ## Install ```sh sudo av install brew:cctz ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install cctz ``` Evidence: local Homebrew formula metadata ### Linux - Debian apt (92%): ```sh sudo apt install libcctz-dev ``` Evidence: Debian stable package indexes: libcctz-dev from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - dnf (92%): ```sh sudo dnf install cctz ``` Evidence: Fedora Rawhide package metadata: cctz from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst - Nix (92%): ```sh nix profile install nixpkgs#cctz ``` Evidence: nixpkgs package indexes: pkgs/by-name/cc/cctz/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 ## Package facts - **Package key:** brew:cctz - **Package manager:** Homebrew - **Package manager page:** - **Version:** 2.5 - **Source summary:** C++ library for translating between absolute and civil times - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** Apache-2.0 - **Source archive:** - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - time_tool (cli) - time_tool (alias) ## Build dependencies - cmake ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, sonoma, ventura, x86_64_linux ## Freshness - Page generated: 2026-07-08 - Package-manager version: 2.5 - Local data: ok - Upstream repository: https://github.com/google/cctz - Upstream latest detected: v2.5 (current) - info: No package-manager update timestamp was available. ## Project history and usage CCTZ is Google's C++ date, civil-time, and time-zone library for converting between absolute time and human civil time using IANA time-zone data. It is packaged both as a library and, in Homebrew, with the time_tool example executable. ### Project history The official repository was created in 2015. The README says CCTZ contains a Civil-Time Library and a Time-Zone Library that cooperate with C++ , giving programmers tools for date, time, and time-zone work. CCTZ had a v1.0 release in March 2016 and a v2.0 release in April 2016, followed by v2.1 in 2017, v2.2 in 2018, v2.3 in 2019, v2.4 in 2024, and v2.5 in 2025. ### Adoption history The README documents Bazel as the preferred build system while also supporting Make and CMake. The input package facts list Homebrew, Debian/Ubuntu libcctz-dev, Fedora/DNF, and Nix packages, showing adoption as a reusable C++ library rather than only as an application. ### How it is used CCTZ is used by C++ programs that need correct civil-date arithmetic and conversion between time zones and absolute time points. The README points users to cctz/civil_time.h, cctz/time_zone.h, examples, Bazel, CMake, and system-installed IANA zoneinfo data. ### Why package nerds care CCTZ is package-nerd significant because time-zone handling is notoriously edge-case heavy, and this library packages a focused C++ solution around IANA data before broad standard-library time-zone support was common in deployed toolchains. ### Timeline - 2015: Official GitHub repository created. - 2016: v1.0 and v2.0 releases published. - 2019: v2.3 release published. - 2024: v2.4 release published. - 2025: v2.5 release published. ### Related projects - The README references C++ , the IANA time-zone database, Bazel, GoogleTest, and CMake. - The README also links older ISO C++ proposals for standardizing civil-time and time-zone libraries. ### Sources - - - - ## Security Notes library-like package without higher-risk signals. - **Geiger risk:** green / low - library-like package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** cctz - **Version Scheme:** 0 - **Revision:** 0 - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** stable ## Other Package-Manager Records - Debian apt - libcctz-dev - 2.4+dfsg1-2: normalized package name match | Debian stable package indexes: libcctz-dev from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Library for computing dates, times and time zones, development files | https://github.com/google/cctz - Debian apt - libcctz-doc - 2.4+dfsg1-2: normalized package name match | Debian stable package indexes: libcctz-doc from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Library for computing dates, times and time zones, documentation | https://github.com/google/cctz - Debian apt - libcctz2.4 - 2.4+dfsg1-2: normalized package name match | Debian stable package indexes: libcctz2.4 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Library for computing dates, times and time zones, shared library | https://github.com/google/cctz - Nix - cctz: normalized package name match | nixpkgs package indexes: pkgs/by-name/cc/cctz/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Ubuntu apt - libcctz-dev - 2.3+dfsg1-5build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libcctz-dev from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Library for computing dates, times and time zones, development files | https://github.com/google/cctz - Ubuntu apt - libcctz-doc - 2.3+dfsg1-5build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libcctz-doc from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Library for computing dates, times and time zones, documentation | https://github.com/google/cctz - Ubuntu apt - libcctz2 - 2.3+dfsg1-5build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libcctz2 from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Library for computing dates, times and time zones, shared library | https://github.com/google/cctz - dnf - cctz - 2.5-3.fc44: normalized package name match | Fedora Rawhide package metadata: cctz from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Translating between absolute and civil times using time zone rules | https://github.com/google/cctz - dnf - cctz-devel - 2.5-3.fc44: normalized package name match | Fedora Rawhide package metadata: cctz-devel from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Translating between absolute and civil times using time zone rules | https://github.com/google/cctz ## 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. - [Text processing packages](https://www.automicvault.com/pkg/text-processing-tools/) - Matched text, document, or structured-data processing metadata. - [Developer build packages](https://www.automicvault.com/pkg/developer-build-tools/) - Matched build, compiler, generator, or developer workflow metadata. - [cmake](https://www.automicvault.com/pkg/brew/cmake/) - Build dependency declared by Homebrew. - [manticoresearch](https://www.automicvault.com/pkg/brew/manticoresearch/) - Popular package that depends on this formula. - [znc](https://www.automicvault.com/pkg/brew/znc/) - Popular package that depends on this formula. - [dateutils](https://www.automicvault.com/pkg/brew/dateutils/) - Shares av.db curated category or tags: cli, date-time, developer-tools. - [cpp-peglib](https://www.automicvault.com/pkg/brew/cpp-peglib/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, library. - [ctemplate](https://www.automicvault.com/pkg/brew/ctemplate/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, library. - [enchant](https://www.automicvault.com/pkg/brew/enchant/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, library. - [htmlcxx](https://www.automicvault.com/pkg/brew/htmlcxx/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, library. - [log4cpp](https://www.automicvault.com/pkg/brew/log4cpp/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, library. - [yazpp](https://www.automicvault.com/pkg/brew/yazpp/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, library. - [aarch64-elf-gcc](https://www.automicvault.com/pkg/brew/aarch64-elf-gcc/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools. - [castxml](https://www.automicvault.com/pkg/brew/castxml/) - Local package facts share a topical domain. Shared terms: c-plus-plus, cli, developer, developer-tools, plus. - [ccls](https://www.automicvault.com/pkg/brew/ccls/) - Local package facts share a topical domain. Shared terms: c-plus-plus, cli, developer, developer-tools, plus. ## Combined YAML source View the package source record on GitHub. [combined/cctz.yml](https://github.com/automic-vault/db/blob/main/combined/cctz.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