These metadata are inserted on the Abstract page's "HTML header metadata tags" for each article published in OJS. OJS also makes use of such data under Stats & Reports (Journal Management).
Article metadata are actually important. Some services like Google Scholar, show the publication date in search results, and in case of back issues (imported) "publication date" becomes wrong because it reflects the date it was published through OJS. Also, this may be replicated when one inadvertently deletes an issue, and then publishes it again, and the original "intended" publication date is replaced with a newer date. Google Reader, as another example, shows a received/published date (on the left hand corner) when available, and viewing the OJS RSS feed with this reader, in case of articles processed out of the OJS, "received date" are not the actual date. In addition, "Items published" in 2009, for example, in Stats & Reports (Journal Management) might incorrectly show over a hundred, when this figure only reflects the imported back issue items of previous years.
It is true OJS should set the dates automatically as it does, but for the cases explained, I am looking for a way to be able to correct these data.