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Use DATEADD to the appropriate number of hours from the time you see, which is in UTC. That will either be CST or CDT, depending on the time of year, so either -6 or -5, respectively. I actually use a "Timezone" parameter on my data sources that connect to the Tableau Server PostgreSQL database because it makes switching timezones pretty easy. You can just download one, copy the parameter, and paste it into your own workbook, then do the date match with the offset it represents.