The TZ Version Parrot simply announces the release version (e.g. 2015d, 2019a) of the ICU time zone data that it loaded.
Display the version of time zone from the icudtl.dat monolithic file:
fx shell "run fuchsia-pkg://fuchsia.com/tz_version_parrot#meta/tz_version_parrot.cmx"
Sample output:
Squawk! TZ version (from icudtl.dat) is: 2019a
Display the version of time zone from time zone .res files, if available:
fx shell "run fuchsia-pkg://fuchsia.com/tz_version_parrot#meta/tz_version_parrot_with_tzdata.cmx"
In order for tz_version_parrot_with_tzdata.cmx, which attempts to load .res files, to work, the product being built must include those resource files using a config_data GN rule that places them in the expected location (see kTzdataDir in main.cc).
The actual .res files live in //third_party/icu/tzres.
To smoke-test the icudtl.dat case, run
fx run-test tz_version_parrot_test