Did you enable the option in the admincp (under Private Messaging Options)? It's disabled by default, since I didn't want people to turn it on unless they were aware that the date/time stamps would hang around even after uninstalling.
When it's turned on, you should see the date/time stamp in the quote tag (in the quick reply box, for example, like:
Quote:
Originally Posted by aaaab - Fri, 21 Dec 2012 03:55:18 +0100
test
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If you're not seeing that then you won't see the date str in the message.
On another subject: I realize that you customized your template for the previous version then I changed it - would it help if I posted the changes in the quote template that were made for the new version?