Q: Error in ePub file Converted from Pages?

Hello,

I've been trying to upload an ePub to a ebook publishing website called BookBaby but after they did the EpubCheck this error came up and I don't know how to correct it:

Test: EpubCheck

ERROR: /BK00028717.epub/OPS/epb.opf(2,818): assertion failed: dcterms:modified illegal syntax (expecting: 'CCYY-MM-DDThh:mm:ssZ')

Check finished with warnings or errors

I converted a Pages document into an ePub, and I tried contacting BookBaby directly, but they couldn't help.

How do I correct this?

Thank you