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Also add the basic types for timezones, without the non-inline definitions needed to actually use them. The get_leap_second_info function currently uses a hardcoded list of leap seconds, correct as of the end of 2022. That needs to be replaced with a dynamically generated list read from the system tzdata. That will be done in a later patch. libstdc++-v3/ChangeLog: * include/std/chrono (utc_clock, tai_clock, gps_clock): Define. (clock_time_conversion, clock_cast): Define. (sys_info, local_info): Define structs for timezone information. (nonexistent_local_time, ambiguous_local_time): Define exceptions for invalid times. (time_zone, time_zone_link, leap_second, zoned_traits, tzdb) (tzdb_list): Define classes representing time zones. (get_leap_second_info): Define new function returning leap second offset for a given time point. * testsuite/std/time/clock/gps/1.cc: New test. * testsuite/std/time/clock/tai/1.cc: New test. * testsuite/std/time/clock/utc/1.cc: New test.