The Time Zone Info Service provides:
For the protocols, see fuchsia.intl.TimeZones.
For the underlying implementation, see `//src/lib/time_zone_info.
To integrate the service into a product target, add a dependency on "//src/intl/time_zone_info_service:pkg". That target will also pull in the sysmgr configuration needed to map fuchsia.intl.TimeZones to this service component.