Perhaps there is part of your question that I am not understanding very well, but it seems obvious to me that if the summertime is disabled by default, that you would certainly have to enable it to configure the new daylight savings time dates.
If I have missed something perhaps you can clarify.
The summer-time command tells the router to refer to Daylight Saving Time as Central Daylight Time (CDT), which will automatically occur according to predefined dates and times on the router. (You can use the same command to manually set the date and time for Daylight Saving Time.) The recurring option tells the router to use the accepted U.S. Daylight Saving Time rules for the annual time changes in April and October. Since for 2007 Congress has changed those dates, many devices will be off for the three weeks after DST begins and for three weeks before DST ends.
You can search Cisco's IOS download site for appropriate code for your device(s) (read the release notes to see what version fixes the issue) or turn off the auto DST feature and manually adjust your time on the new DST start/end dates.
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