The date of publication for the media carrier being cataloged should be indicated in the “Date of Publication” 260c field. The original date on which a recording was made should be indicated in the “Date/Time and Place of Event” 518 field.
Per “Organizing Audiovisual and Electronic Resources for Access” by Ingrid Hsieh-Yee:
The publication date of the edition in hand is the third element for Area 4 [MARC field 260] and is entered in subfield $c. If an item contains multiple dates, publication date is preferred to copyright date or printing date. If a publication date is not available, the cataloger will use the copyright date. AACR2r offers an option to include both the publication date and the copyright date if they are different. The Library of Congress decided in 1989 that it would not apply this option to monographs or print serials. (pg. 19)
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