will be the upgrading of our Sybase databases to 64 bit, including migration of the date fields to 64 bits

Don't you use a DATETIME column for those dates? (datetime handles dates up to the year 9999...)

And if you're going to 64bit ints in the database I assume you're moving to ASE 15.0? (ASE 15.0 has the BIGINT datatype, though I suppose you could be using a NUMERIC() for this as well)

Michael