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From semantic-mediawiki.org
Fragment of a discussion from Help talk:Eventcalendar format
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!