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https://jira.duraspace.org/browse/DS-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=27664#comment-27664
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Tim Donohue commented on DS-1481:
---------------------------------
Here's some incorrect "dc.date.issued" examples forwarded on from Darcy Dapra
at Google:
===
Please find following some examples of repositories with a large fraction of
the collection indicating incorrect date-values in its metatags:
http://uir.unisa.ac.za/handle/10500/2584
<meta name="DCTERMS.dateAccepted" content="2009-09-04T12:47:45Z"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.available" content="2009-09-04T12:47:45Z"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.issued" content="2009-09" scheme="DCTERMS.W3CDTF" />
<meta content="2009-09" name="citation_date" />
The PDF says 2005:
http://uir.unisa.ac.za/bitstream/handle/10500/2584/thesis_roos_w.pdf?sequence=36
---------------------------
http://dspace.cc.tut.fi/dpub/handle/123456789/7007
<meta name="DCTERMS.dateAccepted" content="2011-03-31T11:50:43Z"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.available" content="2011-03-31T11:50:43Z"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.issued" content="2011-03-31" scheme="DCTERMS.W3CDTF" />
<meta content="2011-03-31" name="citation_date" />
However, the PDF says it was published in 2004:
http://dspace.cc.tut.fi/dpub/bitstream/handle/123456789/7007/canfield_linear_and_nonlinear_optical.pdf?sequence=1
-------------
http://cardinalscholar.bsu.edu/handle/handle/182236
<meta name="DCTERMS.dateAccepted" content="2011-06-03T19:32:47Z"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.available" content="2011-06-03T19:32:47Z"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.created" content="1998" xml:lang="en_US"
scheme="DCTERMS.W3CDTF" />
<meta name="DCTERMS.issued" content="2011-06-03" scheme="DCTERMS.W3CDTF" />
<meta name="citation_date" content="2011-06-03" />
> "dc.date.issued" is often incorrectly set (reported from Google)
> ----------------------------------------------------------------
>
> Key: DS-1481
> URL: https://jira.duraspace.org/browse/DS-1481
> Project: DSpace
> Issue Type: Improvement
> Components: DSpace API
> Affects Versions: 1.7.0, 1.7.1, 1.7.2, 1.8.0, 1.8.1, 1.8.2, 3.0, 3.1
> Reporter: Tim Donohue
> Fix For: 4.0
>
>
> Google (Anurag Acharya and Darcy Darpa) has contacted DuraSpace about a
> common indexing issue affecting all DSpace sites.
> When Google & Google Scholar index DSpace content (from a variety of
> institutions), the "dc.date.issued" value is incorrect the majority of the
> time. The reason is that, if unspecified, DSpace sets this issued date to the
> *date of accession* (i.e. date that it was submitted to DSpace), see:
> https://github.com/DSpace/DSpace/blob/master/dspace-api/src/main/java/org/dspace/content/InstallItem.java#L130
> Google says this causes their crawlers (for both Google & Google Scholar) to
> assume that the date of accession is actually the formal publication date.
> Rather than defaulting the 'dc.date.issued' to the accession date, Google
> recommends we leave it blank. DSpace is already tracking the accession date
> separately (in 'dc.date.accessioned'), so it seems odd to set
> 'dc.date.issued' to the same value by default.
> Google will be sending along some examples of this. They said they have seen
> repositories, where 30-50% of their items all have the same "dc.date.issued",
> as those items were all imported on the same date.
> This seems like a very reasonable recommendation to me as well. I'm not sure
> we should be setting 'dc.date.issued' by default, as it really is meant to be
> the date of *formal publication*, and not the date that something is made
> available on the web.
> This also seems like a small fix (remove a few lines from InstallItem).
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