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I was just looking at general preferences for a XOOPS site, and there is no admin setting for date format that could be read into a smarty variable. I think this would be a good addition to the core.
Several modules have configuration options for date format, but when you want to get them all consistent, you need to change every module. Having a global setting that can be used in themes and modules would add another bit of overall site consistency to Xoops.
I'll be searching the dev site at Sourceforge for this...