For information on converting to InterSystems IRIS, see the
InterSystems IRIS Adoption Guide
and the InterSystems IRIS In-Place Conversion Guide,
both available on the WRC Distributions page (login required).
Custom DATE data type designed to convert FILEMAN format YEAR fields.
A field defined as a YEAR data type can accept many of the date entries, but only stores the YEAR portion.
Example: External: 2016