Hello again @tsullivan, sorry to come back on this, but I got an idea while working on the feature in my project.
Right now Kibana offers basically 2 choices for the dateFormat:tz setting: either the client (i.e. Browser) time zone, or a specific time zone chosen from an explicit list (e.g. America/New_York).
Why not add also the Server choice? The Kibana server is surely running in an environment with a configured time zone, be it a virtual machine, a bare metal machine, or a Docker container; if I could choose to localize data in the server time zone, I could just configure the server time zone accordingly (as I already do for other components of my project), and the data would be localized in THAT time zone. If that changes, I would not have to change the Kibana setting, as it would already be set to Server.
Do you think this might make sense as a feature request? It would make sense in my use case, but do you think it might be useful also to others?