Decode TZif (Time Zone Information Format) files into Time.Zone values for using with elm/time.
elm install justinmimbs/tzifThis package provides a single bytes decoder:
decode : Bytes.Decode.Decoder Time.ZoneIf you need Time.Zone values for using with elm/time, then one approach is to fetch the required zones at run-time. See examples/GetZone.elm for an example that fetches the local time zone.
You can use the IANA Time Zone Database to build a set of TZif files for all time zones.
See examples/build.sh for an example that does the following:
- clones the IANA Time Zone Database repository
- compiles TZif files for the latest release
The script installs TZif files to dist/<version>/, where <version> is the latest release (e.g. 2019c).
The script builds TZif files that contain all transitions between 1970 and 2037. However, if your application only uses timestamps after, say, 2010, then you can build smaller TZif files by limiting the range accordingly.
Note: A Unix-like computer usually has a set of TZif files installed at /usr/share/zoneinfo/; however, I would not recommend distributing those to clients of your web application because they are likely to be bloated for backward-compatibility and contain a vast range of transition times. If you build your own as described above, then you can build smaller files for just the time range you need.