The time is always displayed in whatever timezone is set in the user’s browser.
Times are stored as unix timestamps (i.e. UTC) and then converted into the user’s timezone in the client via moment.js.
You can see this in action by viewing any events topic, e.g. this topic, in two different timezones.
You can open a chrome window in a different timezone by creating the dir ~/chrome-profile then running
TZ='US/Pacific' open -na "Google Chrome" --args "--user-data-dir=$HOME/chrome-profile"