We experienced that bug a while back, and this is the patch
information from HPSWINFO.PUB.SYS:
 
Following HPDeskManager Patch installed - SUN, SEP 24, 1995,  9:52 PM
 
OD2003   500-3276998 - HPMAIL.HPMAIL.SYS and PRNTSERV.HPMAIL.SYS.
The date of year in Calandar area was not correct when doing LIST.
 
Rick Soper - New Haven Unified School District
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P.S. If OD2003 doesn't look like a normal patch id it's because
     it isn't.  Desk patches don't use AUTOPAT anymore, which has
     really simplified the process.  Now, we bring down Desk, stream
     a job and then bring Desk back up.  Not that I want to install
     a lot of Desk patches, but this is a great improvement.