Had to clarify whether displaying the time format in CST,EST etc depends on the

Date/datetime display depends on either the user's preferred time zone (in some cases process initiator time zone), or (if not set) the configured default time zone for your environment (System tab in designer -> Data Management -> Internationalization Settings). If you want to display datetime in a particular time zone you can use the gmt() function as: =gmt(pv!datetime,"CST")