Great article from WebTrends on what you need to do before this weekends change to Day Light Savings time here in North America.
Basically you don't need to do anything if you're running your profiles with the default settings. However, if you are using the custom time zone settings, you need to apply a patch.
The article references WebTrends 8.0d, but a check of their download site does not show a version 8.0d being available. My guess is that the patch is the equivalent, unfortunately the article is a bit vague on this.
What's interesting is that the patch became available on March 2, barely a week before needed. Yet given the formal policies in most organizations about applying patches to production servers, I expect many organizations won't have the patch in place on time.
I also find it surprising that WebTrends hasn't issued a notice of the patch and instead has relied on a message being displayed when you log into your WebTrends. Since many people ignore these WebTrends marketing messages I'm sure many organizations didn't even get the message that there is a patch available.