Best practice: When encoding date information, give the fullest information about the date that is readily available (the date in field 046 may be more precise than a date used in the 100 subfield $d). When revising existing authority records, record dates in field 046 even if the heading itself does not have dates in 100 subfield $d, when the information is readily available. | Best practice: When encoding date information, give the fullest information about the date that is readily available (the date in field 046 may be more precise than a date used in the 100 subfield $d). When revising existing authority records, record dates in field 046 even if the heading itself does not have dates in 100 subfield $d, when the information is readily available. |