126 ClockDefault ConfigurationSummer time is disabled.offset offset — default is 60zone acronym — If unspecified default to the timezone acronym.If the timezone has not been defined, the default will be UTC.Command ModeGlobal Configuration mode.User Guidelines• In both the date and recurring forms of the command, the first part of the command specifies whensummer time begins, and the second part specifies when it ends. All times are relative to the local timezone. The start time is relative to standard time. The end time is relative to summer time. If thestarting month is chronologically after the ending month, the system assumes that you are in thesouthern hemisphere.• USA rule for daylight saving time:• Start: Second Sunday in March• End: First Sunday in November• Time: 2 am local time• EU rule for daylight saving time:• Start: Last Sunday in March• End: Last Sunday in October• Time: 1.00 am (01:00) Greenwich Mean Time (GMT)ExamplesThe following example sets summer time starting on the first Sunday in April at 2am and finishing onthe last Sunday in October at 2 am.sntp authentication-keyThe sntp authentication-key Global Configuration mode command defines an authentication key forSimple Network Time Protocol (SNTP). Use the no form of this command to remove the authenticationkey for SNTP.Console (config)# clock summer-time recurring first sun apr 2:00last sun oct 2:005400_CLI.book Page 126 Wednesday, December 17, 2008 4:33 PM
