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8 versions of UUID and when to use them
(www.ntietz.com)
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Personally, I always regarded UUID as one of those overcomplicated and frankly unneded "enterprisey" standards (similar to SOAP and XSD, XSLT and various other XML techonologies). After reading this article my opinion didn't change.
Also... do they even know what "version" means? That they choose that word over "type" or any other alternative says it all.
Please, do NOT rely on that and just add to your tables a field with the actual timestamp.
He's not suggesting to replace timestamps (nor database sequences). They're unique identifiers, and they happen to include a timestamp.