QTECH QSW-3400 Инструкция по настройке - Manual (Page 444)

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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