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From semantic-mediawiki.org
Fragment of a discussion from Help talk:Eventcalendar format
The test on sandbox failed because of the experimental Content Security Policy setting. It is now working as expected after removing the policy setting.
Yup. That did the trick, and the code that does not work on my own server works just fine in the Sandbox - even without explicitly defining any date datatypes (maybe that's done behind the scenes somewhere?). Thanks for pointing out the sandbox for me, that at least gives me a place to start! I'll pour through the versions and requirements. In the end, it may simply be a matter of ripping and reinstalling SMW and SRF.
I'm still struggling a little with the syntax to define a date datatype, but I'll play around with it in the sandbox until I figure that out.
Thanks again!