I've had a look in cgi/oai2, specifically at the sub Identify to see how the earliestdateStamp is determined. Presumably the search performed here is returning an incorrect result. I've compared with the version of this file on the eprints github  and can't spot any differences in this section. I could hard code the date, but it's possible/likely this will change if the earliest record is edited. I would like to do it properly if possible and chase down the actual cause.

Can anybody shed any light on this?

Thanks,

James