[Zope] Zope Dates

Hello all Hoping there is a quick fix for this - I'm trying to change how Zope formats dates. I want dd/mm/yyyy but Zope is forcing yyyy-mm-dd. I've changed the format in zope.conf to 'international' but this makes no difference. I know dates can be formatted at the front end (i.e. fmt=) but it would be really useful to have Zope sort this out for me without having to do any string formatting. Any ideas? Thanks Richard