Dealing with years before 2000
This version is fully compliant with the change of year to 2000
To make sure that earlier data is compatible two digit dates fields are retained in some places and are interpreted as follows.
00-79 are the years 2000 to 2079
80-99 are the years 1980 to 1999
When entering the years 2000 to 2009 as two digit fields enter the preceding zero. For example enter 2009 as 09
