Determines the last date the physical file was copied from disk with a WFL ADD or COPY statement that did not specify the & BACKUP option. When library maintenance copies the file from disk it sets COPYSOURCEDATE to the current date and, when the file is copied back to disk library maintenance, resets COPYSOURCEDATE to the CREATIONDATE. Refer to the File Attributes Programming Reference Manual for a description of the CREATIONDATE file attribute.