modified date on table after alter command

Using SQL Server 2000 - Trying to find a modified date for table after
issuing an alter table command. Sysobjects has crdate I can not find modifed
date.
Need ithe nfo for SOX to prove that no tables have been modified unless
approved.There is no buitlin facility to find table schema is altered in 2000.
you have to create your own script or use thire party tool for
monitoring schema changes in SQL Server 2000.
If you are using SQL Server 2005 sys.objects has modified_date column
which shows information when object was last modified.
Regards
Amish Shah