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A general description is here.
There is support to use the included (64-bit) time-zone conversion code and Olson time-zone database: use ‘configure’ option ‘--with-internal-tzcode’. This is the default on Windows and OS X.
(It might be necessary to set environment variable ‘TZ’ on OSes where this is not already set, although the system timezone is deduced correctly on at least Linux, OS X and Windows.)
This option also switches to the version of ‘strftime’ included in directory ‘src/extra/tzone’.
In some extreme cases (more than 10^15) integer inputs to dpqrxxx functions might have been rounded up by one (with a warning about being non-integer). (PR#15624)