The local machine's default timezone, including applicable Daylight Savings / Summer Time rules, is used if no explicit time zone is given.
Thanks very much for your answer, Tres. Now I've been able to understand what's doing and provide a patch.
I've created a new Issue in the Collector and attached the patch with some unittests there: http://www.zope.org/Collectors/Zope/1780
Hope this help
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