Question 1

How do I install and use CCTZ with CMake?

Accepted Answer

Clone the repository, create a build directory, and run CMake with -DCMAKE_BUILD_TYPE=Release and -DCMAKE_POSITION_INDEPENDENT_CODE=ON. Then, use find_package(cctz) and target_link_libraries in your CMakeLists.txt, as detailed in the README.

Question 2

CCTZ vs Boost.DateTime for time zones: which should I use?

Accepted Answer

CCTZ integrates better with C++11 and focuses on correctness with IANA data, while Boost.DateTime is more established but can be heavier. Choose CCTZ for modern C++ projects needing clean integration, or Boost for broader compatibility.

Question 3

Does CCTZ handle leap seconds correctly?

Accepted Answer

CCTZ uses the IANA time zone database, which includes leap second information, so conversions should account for them. However, for precise leap second handling in absolute time, check the library's documentation or test cases to confirm behavior.

Question 4

What's the performance like for frequent time zone conversions?

Accepted Answer

Conversions involve looking up time zone rules from the system database, which can add overhead. To optimize, cache cctz::time_zone objects after loading them once, rather than reloading for each conversion.

Question 5

How can I update the time zone data used by CCTZ?

Accepted Answer

CCTZ relies on the system-installed IANA database, so update it via your OS package manager (e.g., apt-get install tzdata on Linux). On Windows, you may need to manually install or update zoneinfo files.

Question 6

Is CCTZ thread-safe for concurrent time zone operations?

Accepted Answer

The civil-time library is thread-safe as it's stateless. For time zone operations, loading time zones with cctz::load_time_zone should be done once and shared, but consult the FAQ or code for specific thread-safety guarantees.

CCTZ

What is CCTZ?

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