Tantek asked me a while back about why my site has DDMMYYYY datestamps. Well, that's how we do it round these parts. 
But, of course, DDMM(YY)YY is just UK convention. My site is now YYYYMMDD (styled with dots, dashes and slashes depending on context). You should rock your date-time stamps and make them compliant with the ISO date format. Makes pesky things like XML Schema (and RELAX NG and everything else that's based on XSDs) and microformats compliance easier.
And, if everyone uses YYYYMMDD, we will have a lot less confusion. Promise.
