Portable Date Default in Schema File

My dbimport failed since somebody had brilliantly changed the default
DBDATE when exporting to something other than the conventional default
-- but some date-type cols in schema were defined like:

expire_dt DATE DEFAULT '12/31/2099' NOT NULL

-- hence the failure-inducing error since the default date string
didn't match the DBDATE format. I ended up deleting the offending
SQL, loading, changing DBDATE back, and adding the defaults back via
alter statements.

Is there a more portable way to declare such a default? I was hoping
to be able to do something like:

expire_dt DATE DEFAULT TODAY + UNITS 100 YEAR NOT NULL

-- but syntax for defaults apparently doesn't support this. Does
anyone have a way to get around this? I don't think this detail of
the syntax has changed in later IDS versions. Further, I can't make
assumptions about how the application is using the column, and, hence,
what queries were written, and what would break if data type were
changed, etc.

A better solution would be for dbexport to error out prior to
commencement after determining an incompatible default date format.

Using IDS 10.00.FC6 on RHEL4 (yes, yes dated versions both -- perhaps
you can speak to project poobahs about upgrade? We're too hoarse from
repetition.)