[Archibald Yates]

The newspapers were published in the same time zone. Unless it does matter that Amazon is located in the US.

But why could that be a problem at all? Do the e-books have timezone related timestamps or are their publish dates simple strings containing a date? It should be like that, because a newspaper published on July 10th in California is still a newspaper published on July 10th when read in Australia.

And the publish date is something set in the generating of the .pobi file, it is not the creation date of the file nor the download date. The former would be the day before the publish date and the latter would be sometimes later.