Did you ever come to a solution for this? I am having the exact same problem. Regardless of the user's timezone, I want the users providing timepicker entries in Central time.
All my results in the dashboard are output in Central time and that is working fine. However, when interacting with users across timezones, they get confused when they say "search from 9:00:00 to 10:00:00" and are in Eastern and are getting 8:00:00 to 9:00:00 output.
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