The DST characteristics of the POSIX EST5EDT and CST6CDT timezones
depend on whether the implementation uses the built-in POSIX definition
or reads an updated version from the tzdata files, and for POSIX
timezones, there is no specified behavior [1].
To avoid any plaform-specific behavior, we can specify the desired DST
ourselves. We used the timezone values available in
configure/CONFIG_SITE_ENV, which already included DST information, and
means the tests are consistent with our own usage.
[1] https://www.openwall.com/lists/musl/2024/03/05/2
Érico Nogueira
6ef94d744f