Time stamp in email notification for workflow approval notification reflects server time.
Solution
Set the preference TC_audit_use_DefaultDateFormat to true and edit the file %tcroot%\lang\textserver\en_US\timelocal_locale.xml and set default time format (line 109) to
%d-%b-%Y %I:%M EST will show 20-Apr-2022 3:03 EST in an email.
You'll need to restart the tc_server process after changing.
Notes