Manual
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to 00:00 on October 1th, 2012, clock offset as 1 hour, and summer time is named as 2012. 
Configuration procedure is as follows: 
Switch(config)#  clock  summer-time  2012  absolute  23:00  2012.4.1  00:00 
2012.10.1 
Example2: 
The configuration requirement  in the  following:  The summer  time  from  23:00 on  the  first 
Saturday of April to 00:00 on the last Sunday of October year after year, clock offset as 2 hours, 
and summer time is named as time_travel. 
Configuration procedure is as follows: 
Switch(config)#clock  summer-time  time_travel  recurring  23:00  first 
sat apr 00:00 last sun oct 120 
62.4 Summer Time Troubleshooting 
If there is any problem happens when using summer time, please check whether the problem 
is caused by the following reasons: 
  Check whether command mode in global mode 
  Check whether system clock is correct 










