Hi, sorry but Pages don't have publication date (and never had), they were designed for different purpose. Use articles if you need date, yes SPPB can work inside as well (it was documented).

Q: Why do you need date in Pages, can you share any reasonable reason?

I must to have reports from time to time about contents and the reports are preintscreen attached to it. This is the rule for some projects.

In that case you have to add date manually inside Text or Raw HTML addon. Just publish at the top or bottom of page. And update day/month after each content update. I think it's it the only easy solution by now.

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Ok Thank you!

Example: