Accumulated changes since v2.3, including:

• Allow get_weekday() and get_yearday() to take all civil-time types.
• Support %U/%u and %W/%w specifiers internally.
• Handle "slim" TZif files.
• Handle future rules specifying year-round daylight time.
• Use the "backzone" file when building the testdata.

• Add support for the %E*z, %:z, %::z, and %:::z format specifiers.
• Change the abbreviations for fixed-offset time zones to use the same syntax as named time zones with numeric-style abbreviations.
• Add cctz::time_zone functions next_transition(), prev_transition(), version(), and description().
• Make local_time_zone() work on iOS.
• Switch from cctz::sys_seconds to cctz::seconds for the 64-bit, seconds-resolution duration.
• Enable C++14 constexpr for more compilers.
• Add CMake install rules.

Includes CMake support.

This release is CCTZ at the time of the initial Abseil (abseil.io) release.

CCTZ v2.0 includes two complementary libraries for computing with civil times and time zones.
See README.md for more details.

This is CCTZ version 1.0. This is the original API as it was when first released in September 2015.