I've set the time zone in Slack in my profile, but it keeps being reset to "(UTC) Monrovia, Reykjavik". Sometimes it "survives" a page refresh, other times it doesn't. I'm logged in the whole time in Firefox on Linux.
1 Answer
This is being overridden by the workspace preferences. Go there, then to "Language & region", untick "Set time zone automatically", and set your time zone.
Unfortunately this doesn't regenerate the times shown next to messages in chat.