[Zope] operations with dates

[Dimitris Andrakakis]

Hi there,
This must be simple, but I haven't found it in the docs.
Can I get ZopeTime to give me the date, say, 20 days ago ?
Or a month ago ?
Something like (yes I know this won't work) 
<dtml-var expr="ZopeTime - 20")

Dimitris Andrakakis
http://atlas.central.ntua.gr:8000/~mc94068


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