Time Zone on Audit Expense Reports

Currently, the time zone on audit expense reports displays in UTC, even after adjusting preferences. The business requires the time to be shown in CST. They would like to be able to change the default from UTC to CST for final audit stamp or report that pulls from system/server-level data.

The email notification comes through as CST. Worklist items are in CST.  Before it’s approved, it shows CST.  After approved it changes to UTC.  Why can't the default be changed from UTC for final audit stamp and reports?