Date Format Changes in IIS 4.0

I've had odd occurrences where the date format changes
from mm/dd/ccyy to mm/dd/yy when retrieving from IIS 4.0 -
retrieve it from anywhere else on the server, it is
correct. When it occurs, this causes ASP pages to get
confused since the code is expecting the 4 digit ccyy and
it requires the shutdown or IIS admin in order to correct
the format back to the correct setting. The regional
settings are correct, the server is always logged in with
the same user account. The articles from knowledge base
hint around that the settings are stored in cache and
sometimes this cache needs to be refreshed (IIS requests
the refresh), it will pull the "default" regional settings
instead of the current user account that is logged on at
the time.

Has anyone else experienced this situation ? Anyone have
any clues ? Is there some type of tracing that can be done
(other than adplus) to capture any clues to this
occurrence ? This situation could occur 3 or 4 times in a
week or not show up for months. The event logs don't
appear to reveal anything to the cause. thanks for ready
my message.
Joey
NT 4.0+sp6a
IIS 4.0+patches
MDAC 2.8