When set to TRUE, the date validation code is changed so that dates that match a prior revision date are valid.
Setting this variable allows an archive import and batch load process to import revisions of a content item that have matching creation dates or release dates.
Standard date validation in the archiver normally disallows an import of a revision that matches or is within a minute of the prior revision of a document.
IntradocDir/config/config.cfg
AllowMatchesInDateCheck=TRUE