macOS
Homebrewverified · 100%
brew install cctzlocal Homebrew formula metadata
brew
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
Additional install commands
Linux
Debian aptverified · 92%
sudo apt install libcctz-devDebian stable package indexes · libcctz-dev · source: deb.debian.org
Fedora dnfverified · 92%
sudo dnf install cctzFedora Rawhide package metadata · cctz · source: dl.fedoraproject.org
Nixverified · 92%
nix profile install nixpkgs#cctznixpkgs package indexes · pkgs/by-name/cc/cctz/package.nix · source: api.github.com
overview
Package summary
C++ library for translating between absolute and civil times
Project links
Commands and aliases
- time_tool
history
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++ <chrono>, 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++ <chrono>, 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 posture
Risk level: green
library-like package without higher-risk signals.
Risk classifier
green risk · low confidence · appliance
Why
- library-like package without higher-risk signals
Signals
- metadata:library-like
Install behavior
- No Homebrew post-install hook is recorded in formula metadata.
- Homebrew bottle metadata is available for 8 platform targets.
- Build metadata lists 1 build dependencies.
Recommended review
Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.
executables
Installed executables
| Command | Kind | Exposure | Note |
|---|---|---|---|
time_tool | cli | global executable |
freshness
Version and freshness
These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.
page generated2026-07-08
manager version2.5
manager updated
local dataok
upstreamcurrent
latest detectedv2.5
https://github.com/google/cctz
- infoNo package-manager update timestamp was available.low confidence
install metadata
Package metadata
| Package key | brew:cctz |
|---|---|
| Version | 2.5 |
| Package manager | Homebrew |
| Package manager page | https://formulae.brew.sh/formula/cctz |
| Homepage | https://github.com/google/cctz |
| Repository | https://github.com/google/cctz |
| Upstream docs | https://github.com/google/cctz#readme |
| License | Apache-2.0 |
| Source archive | https://github.com/google/cctz/archive/refs/tags/v2.5.tar.gz |
| Build dependencies | cmake |
| Bottle | available (on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, sonoma, ventura, x86_64_linux) |
| Homebrew post-install | not defined |
| Service | none declared |
registry facts
Source database details
| Source Database | Homebrew formula API |
|---|---|
| Tap | homebrew/core |
| Full Name | cctz |
| Version Scheme | 0 |
| Revision | 0 |
| Bottle Stable Root URL | https://ghcr.io/v2/homebrew/core |
| Deprecated | no |
| Disabled | no |
| Keg Only | no |
| URL Keys |
|
source database matches
Other package-manager records
Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.
Debian apt95%
libcctz-dev 2.4+dfsg1-2
Library for computing dates, times and time zones, development files
https://github.com/google/cctz
sudo apt install libcctz-dev- Section: libdevel
- Architecture: amd64
- Source Package: cctz
- 1 dependencies
- 3 optional deps
- normalized package name match
- Matched by: Cctz
Debian apt95%
libcctz-doc 2.4+dfsg1-2
Library for computing dates, times and time zones, documentation
https://github.com/google/cctz
sudo apt install libcctz-doc- Section: doc
- Architecture: all
- Source Package: cctz
- normalized package name match
- Matched by: Cctz
Debian apt95%
libcctz2.4 2.4+dfsg1-2
Library for computing dates, times and time zones, shared library
https://github.com/google/cctz
sudo apt install libcctz2.4- Section: libs
- Architecture: amd64
- Source Package: cctz
- 3 dependencies
- normalized package name match
- Matched by: Cctz
Nix95%
cctz
nix profile install nixpkgs#cctz- normalized package name match
- Matched by: Cctz
Ubuntu apt95%
libcctz-dev 2.3+dfsg1-5build1
Library for computing dates, times and time zones, development files
https://github.com/google/cctz
sudo apt install libcctz-dev- Section: universe/libdevel
- Architecture: amd64
- Source Package: cctz
- 1 dependencies
- 2 optional deps
- normalized package name match
- Matched by: Cctz
Ubuntu apt95%
libcctz-doc 2.3+dfsg1-5build1
Library for computing dates, times and time zones, documentation
https://github.com/google/cctz
sudo apt install libcctz-doc- Section: universe/doc
- Architecture: all
- Source Package: cctz
- normalized package name match
- Matched by: Cctz
Ubuntu apt95%
libcctz2 2.3+dfsg1-5build1
Library for computing dates, times and time zones, shared library
https://github.com/google/cctz
sudo apt install libcctz2- Section: universe/libs
- Architecture: amd64
- Source Package: cctz
- 3 dependencies
- normalized package name match
- Matched by: Cctz
dnf95%
cctz 2.5-3.fc44
Translating between absolute and civil times using time zone rules
https://github.com/google/cctz
sudo dnf install cctz- License: Apache-2.0
- Category: Unspecified
- Architecture: i686
- Source Package: cctz
- 5 dependencies
- 2 provides
- normalized package name match
- Matched by: Cctz
dnf95%
cctz-devel 2.5-3.fc44
Translating between absolute and civil times using time zone rules
https://github.com/google/cctz
sudo dnf install cctz-devel- License: Apache-2.0
- Category: Unspecified
- Architecture: i686
- Source Package: cctz
- 3 dependencies
- 2 provides
- normalized package name match
- Matched by: Cctz
source trail
Generated from repository data
This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.
Combined YAML source
View the package source record on GitHub.
Used sources
- Geiger risk classifier
- Nucleus package database
- av.db category and tag curation
- cross-ecosystem install command graph
- curated package history
- external package-manager database matches
- package relationship graph
- package version freshness
- package-page enrichment