If the format string for the DATETIME-TZ does not include the time zone offset, the AVM converts the DATETIME-TZ data to the local date and time and displays the data with the time zone offset specified by this attribute.
If the format string for the DATETIME-TZ includes the time zone offset, the AVM ignores this attribute and displays the data in the local time of the value, along with the time zone offset.
Set this attribute to the Unknown value (?) to use the session's time zone offset for display.