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The "Original Publication Date" shown in the metadata for an Ebook Central ebook refers to the date of this particular publication - not the date the book was originally published. So, for example, even though the book Moby Dick was first published well over one hundred years ago, the Ebook Central version is shown in the metadata with a publication date of 10/2009 – which is the date that this particular version with this particular forward, etc. was published - versus the date the book was first published, which was 10/1841. 

If you have any additional questions please contact ProQuest Ebook Support by submitting a case here https://support.proquest.com/submitcase