Can you, please, take a look about upgrading bugzilla or timezone-data (either system or perl's, depends where it fetches timezones list from)? There is some new timezones in 2016c+ timezone-data, and they're missing in profile settings. Reproducible: Always
ping?
The bugzilla host has the latest stable ebuilds for both system & perl timezone data: dev-perl/DateTime-TimeZone-1.930.0 sys-libs/timezone-data-2016e Can you be more specific about what timezone is missing?
For example: Asia/Tomsk Asia/Barnaul
Those are not even present in upstream dev-perl/DateTime-TimeZone-1.940 You need to ask upstream Perl to update their code.
Upstream for DateTime-TimeZone have already shipped versions with the Asia/Tomsk zone. 1.980.0+ https://metacpan.org/diff/file?source=DROLSKY/DateTime-TimeZone-1.97&target=DROLSKY/DateTime-TimeZone-1.98#lib/DateTime/TimeZone/Asia/Tomsk.pm Just somebody gentoo-perl side has to bump it up.
@mva: The new version is deploying on Infra servers now, should be present before 24 hours elapsed.