I use 2 different files one that updates the date and time. Both of those are separate attibuted blocks and only the ones in the current drawing tab get updated. The other file updates the date and time attributes built into a title block. If any of these interest you send me an email: smotichek@projectconsulting.com.
If you want to update a title block, let me know what the attribute tag is for the date and the format for date and I'll send it to you. The format for the date is currently MM-DD-YY and the time is in military.
SEMott Stephen E. Motichek
Project Consulting Services, Inc.