[htdig] date_factor uses inappropriate meta tags?

[Martin . Budden]

Hi everyone,
I just tried setting date_factor to give more recent pages more weight.  I found that the top-returned documents are from way in the future (e.g. 12-12-2005).  When I look at the file properties, they were all 12-12-2003, which is when the file was created.  I looked in the metadata, the DC.Date.Created, DC.Date.Issued, DC.Date.Modified were all also 12-12-2003.  However the DC.Date.Review metadata is 12-12-2005, so I'm guessing that is what htdig is using for date_factor.  Is this an htdig bug?  Can I get around this problem somehow?
Thanks
Martin