Looking back thru old release notes the "problem" date format was introduced as 
an option in the DP26E release

Section of of Lew's readme.txt copied below FWIW

"Version DP26E is the official Y2K release.  June 24, 1999
I have tested it somewhat, but classify it as a beta version until more 
users can help me look for bugs.  There are many changes, so I'm not at 
all confident that adequate testing has been performed.

The specific Y2K change is the addition of the "rollover" option for all
date fields.  However, it is only active during data entry if the date field
format has only 2 digits for the year.  If you specify a non-zero value for
the 2 digit "rollover" value, the year of the entry is compared to it.  If 
the rollover is more than the entry, the entry is added to 2000, otherwise 
to 1900.  Thus, if the date format is D99/99/99 and the rollover value is 
50, 01/01/49 is 01/01/2049, while 01/01/50 is 01/01/1950.

The rollover option has no effect on previously entered data.
The rollover option has no effect if the year is entered with 4 digits.

The rollover option is active while importing data.  This can be used to
to correct data entered prior to the availability of this opion, BUT PLEASE
use it carefully -- save your data before hand and check that it worked as
you intended.

This required changes to DPEXP, DPIMP, and STE-MGR.

For my own use, I will continue to use 4 digits for the year, and recommend 
that to others also.  Where 2 digits is deemed essential, I recommend a 
rollover value of 80 for forward, ongoing dates.

There is also a new date format.  Here is the "help" description:

  The "new" date format also begins with a "D."  This date format MUST
  contain no "9" digits.  It should have none or 2 "D" characters for
  the day and none or 2 "M" characters for the month.  The other
  alphabetic character, whatever it is, will be used for the year.
  The year character selector should occur none, two, or 4 times.

Examples are DMMDDYYYY  DDD/MM/AA
This editor behaves quite differently than the editor for the standard 
date fields.  You should play with it and determine if you like it better."


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