tzdb is a developer focused R package with two purposes:
It ships an up-to-date copy of the IANA time zone database files.
It provides low-level access to the C++ library, date.
To use the C++ API supplied by tzdb:
Add tzdb to both Imports and LinkingTo.
Access the date API through
*is replaced with the date header you want to use.
Note that while
tzdb/tz.h declares many functions and types, most of their implementations are not present in the header file. This means that the functions in
tzdb/tz.h are not safe to call from your R package. Instead, the most critical helpers have been exposed in a safe way in
tzdb/tzdb.h. Use these instead.