You could try this script on the selected files.
#target bridge
if( BridgeTalk.appName == "bridge" ) {
addDates = MenuElement.create("command", "Add Dates", "at the end of tools");
}
addDates.onSelect = function () {
if (ExternalObject.AdobeXMPScript == undefined) ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript");
var thumbs= app.document.selections;
for(var z in thumbs){
var md = thumbs.synchronousMetadata;
md.namespace = "http://ns.adobe.com/exif/1.0/";
var newDate = md.DateTimeOriginal ? new XMPDateTime(md.DateTimeOriginal.toString()).getDate().getTime() : thumbs.spec.created.getTime();
md.DateTimeOriginal ='';
md.DateTimeOriginal = new XMPDateTime(new Date(newDate));
md.namespace = "http://ns.adobe.com/photoshop/1.0/";
md.DateCreated = '';
md.DateCreated = new XMPDateTime(new Date(newDate));
md.namespace = "http://ns.adobe.com/xap/1.0/";
md.CreateDate='';
md.CreateDate = new XMPDateTime(new Date(newDate));
md.ModifyDate='';
md.ModifyDate = new XMPDateTime(new Date(newDate));
md.MetadataDate='';
md.MetadataDate= new XMPDateTime(new Date(newDate));
}
alert("All done")
};