If there is a way to do this, I don’t think it’s an easy way.  I also don’t think there is really a way to do it for the whole application as you asked.  For a single datetime value, I might have two fields (possibly both non-DB fields) on the screen, one of them the existing UTC datetime and the other a string with a valid time zone name ( sys.time_zone_info  ).  FSM uses these strings, so I don’t think you would need to convert it.  I’d then define a custom Client Script SQL command using T-SQL AT TIME ZONE to return the value in the desired time zone.  This assumes you’re using SQL Server or Azure SQL.