When supplying dates in
field 046, use the Extended Date Time Format (EDTF) schema in all cases except
for centuries; supply dates using the pattern yyyy, yyyy-mm, or yyyy-mm-dd;
always add subfield $2 edtf except after a century. The more consistent use of
$2 edtf is based on a PCCLIST discussion suggestion to simplify the use of $2
(always use except for centuries). Visit above RDA Blog link to read complete article.
