I am having the exact same issue. Here is my output from epubcheck 1.0.5
Epubcheck Version 1.0.5
ERROR: jdghvol1.epub/content.opf(14): date value '2009-12-16 00:00:00-08:00' is not valid, YYYY[-MM[-DD]] expected
ERROR: jdghvol1.epub/toc.ncx(13): unfinished element
ERROR: jdghvol1.epub/toc.ncx(2): assertion failed: first playOrder value is not 1
Check finished with warnings or errors!
What can I do to help you locate and fix these errors in Calibre, as properly validated ePub files are vital for me to be accepted into a certain distribution outlet.
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