Config.cfg, add "date created" line, context provided
webui.itemlist.sort-option.3 = dateaccessioned:dc.date.accessioned:date
webui.itemlist.sort-option.4 = datecreated:dc.date.created:date


Messages.xml, add "date created" lines, in context
<message key="xmlui.ArtifactBrowser.ConfigurableBrowse.sort_by.title">title</message>
<message key="xmlui.ArtifactBrowser.ConfigurableBrowse.sort_by.dateissued">issue date</message>
<message key="xmlui.ArtifactBrowser.ConfigurableBrowse.sort_by.dateaccessioned">submit date</message>
<message key="xmlui.ArtifactBrowser.ConfigurableBrowse.sort_by.datecreated">date created</message>


<message key="xmlui.ArtifactBrowser.AbstractSearch.sort_by.dateaccessioned">submit date</message>
<message key="xmlui.ArtifactBrowser.AbstractSearch.sort_by.datecreated">date created</message>