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How to prevent the generation of inaccurate timestamps or system log messages caused by the new DST rules, outlined in the Energy Policy Act of 2005, in Catalyst switches that run Cisco IOS and CatOS system software
In the 2007 calendar year, daylight saving time (DST) rules can cause Cisco IOS® and the Catalyst operating system (CatOS) to generate timestamps, such as those in system log messages, that are off by one hour.
In CatOS, the set summertimeenablezoneconfiguration command and the set summertime recurring configuration command use the United States standards for DST rules by default.
The Energy Policy Act of 2005 (H.R.6.ENR), Section 110 changes the start date of DST from the first Sunday of April to the second Sunday of March, and it changes the end date from the last Sunday of October to the first Sunday of November.