Shows or hides additional timezone on the calendar.
AFTKN_ALTERNATE_TIMEZONE or 993
VOID AlternateTimeZone( [BOOL] DisplayAlternateTimeZone; [WIDESTRING] AlternateTZRegKey)
(Optional) TRUE to display the alternate time zone, FALSE to hide it.
(Optional) Identifies one of the subkey’s under “HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Time Zones” to use as the new alternate time zone. For instance, “Alaskan Standard Time”.