Running the plistlib selftest fails for me: it uses xml.utils.iso8601, which apparently isn't part of the standard library.

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It's part of PyXML. The doc string explains that Date support depends on PyXML. The test is only an onformal test, would you like to formalize it? Or make Date testing optional?

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Ah, I see.

I'd like to turn it into a standard test (to go into test.test_plistlib). Then it can also easily test Date() only if the prerequisites are available.

Are you willing to give this a go? If not reassign to me and I'll get to it eventually.

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I'd like to give this a go at _some_ point, but not now ;-)

Btw. I see xmlrpclib.py does writing of iso8601 dates by itself, but doesn't read them. It's been a while since I read xml.utils.iso8601.py, but if it's not all that much code, perhaps we should just duplicate it in plistlib.py. I have no great use for it, though, plistlib.py is/was mostly targeted to deal with Info.plist files, in which dates are fairly rare...

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I've added a test_plistlib test, which optionally does the Date() test, it skips it if it can't import xml.utils.iso8601.