An embedded timezone library and ~3kB tzinfo database featuring nearly all current timezones present in the IANA timezone database. Designed for use on budget embedded systems with low program space.

The C header containing packed timezone information is generated from the IANA timezone database.

All historical timezone information has been pruned to save space.

A limited number of aliases are available. (by default restricted to the same set that android uses) In cases where the alias is not available, the standard time UTC offset and abbreviation (if present) will be displayed.

This library is generally inflexible as it heavily relies on assumptions pertaining to timezone offset increments, abbreviation formatting, etc to make efficient use of bit packs.

The current utility library does not support parsing / packing all possible syntax of the source IANA tz database. Instead a subset corresponding to the what is needed to correctly parse
most zones is implemented.

zic man page and IANA tz database format documentation

vendored files