With some trepidation I have added this use case to the wiki at http://www.zope.org/Members/fdrake/DateTimeWiki/SuggestedRequirements - Collect reports from a number of branch offices. - Each report has a local date and time, and a Windows time zone. - Store reports with a UTC timestamp added, so they can be sorted by "actual" date and time -- Wade Leftwich Ithaca, NY