The FORMS_TZFILE environment variable specifies the full name of the time zone file. The time zone file specifies historical data and rules for daylight saving time, for a set of time zone regions. It must be either the timezone.dat or timezlrg.dat file that is contained and managed within Oracle 9i or iAS.
If the FORMS_TZFILE environment variable is not set, the only valid time zone region is GMT. Thus, if FORMS_DATETIME_SERVER_TZ and FORMS_DATETIME_LOCAL_TZ are also not set (or are set to 'GMT), then time zone conversions are turned off.
If any of these environment variables is set to an invalid value (non-existent
time zone file or invalid time zone region), then immediately after startup,
an error message will be sent to the client:
FRM-91126 Invalid value %s for environment variable %s
and the runform process terminates.