http://www.networkworld.com/news/200....html?zb&rc=os

From Cisco's Site( http://www.cisco.com/en/US/tech/tk64...37.shtml#intro )
In its daylight-saving directives, Cisco notes that the repercussions of the change extend beyond scheduling and into areas such as security and monitoring. “This change can have a major impact on event correlation activities that are performed as part of normal operations troubleshooting and monitoring,” the Web site says. “For security-related devices, where logs are captured, correlated, and stored for future reference, this time change could render them incorrect for situations where they need to be recalled to rebuild a sequence of events. The incorrect timestamps might not be an issue for events that get immediate action. However, in the future, these events would reference incorrect times.”

Preparing for daylight saving time changes in 2007
http://www.microsoft.com/windows/timezone/dst2007.mspx

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