This may be something so simple I just can't figure it out. I make my ePubs the exact same way every time. It seams that about half the time I get a validation error for a missing date. ERROR: 9780781405058.epub/OEBPS/content.opf(2): date value '' is not valid. The date must be in the form YYYY, YYYY-MM or YYYY-MM-DD (e.g., "1993", "1993-05", or "1993-05-01"). See http://www.w3.org/TR/NOTE-datetime.
when i open the zip file there is no date at all in that space. I could understand if it happened all the time, but it doesn't. I want to be proactive and fix it before i export it to digital editions. Where does one input this date in the InDesign doc?
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