Reference Guide
1480 | System Time and Date
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Syntax
clock summer-time
 time-zone recurring [start-week start-day start-month start-time end-week 
end-day end-month end-time [offset]]
To delete a daylight saving time zone configuration, enter 
no clock summer-time.
Parameters
Defaults
Not configured.
Command Modes
CONFIGURATION 
Command
History
time-zone
Enter the three-letter name for the time zone. This name is displayed in the show 
clock output.
You can enter up to eight characters.
start-week 
(OPTIONAL) Enter one of the following as the week that daylight saving begins 
and then enter values for 
start-day through end-time:
•
week-number: Enter a number from 1-4 as the number of the week in the 
month to start daylight saving time.
•
first: Enter this keyword to start daylight saving time in the first week of the 
month.
•
last: Enter this keyword to start daylight saving time in the last week of the 
month.
start-day
Enter the name of the day that you want daylight saving time to begin. Use 
English three letter abbreviations, for example, Sun, Sat, Mon, etc.
Range: Sun – Sat
start-month
Enter the name of one of the 12 months in English.
start-time
Enter the time in hours:minutes. For the hour variable, use the 24-hour format, 
example, 17:15 is 5:15 pm.
end-week 
 Enter the one of the following as the week that daylight saving ends:
•
week-number: enter a number from 1-4 as the number of the week to end 
daylight saving time.
•
first: enter the keyword first to end daylight saving time in the first week of 
the month.
•
last: enter the keyword last to end daylight saving time in the last week of the 
month.
end-day
Enter the weekday name that you want daylight saving time to end. Enter the 
weekdays using the three letter abbreviations, for example Sun, Sat, Mon etc.
Range: Sun to Sat
end-month
Enter the name of one of the 12 months in English.
end-time
Enter the time in hours:minutes:seconds. For the hour variable, use the 24-hour 
format, example, 17:15:00 is 5:15 pm.
offset (OPTIONAL) Enter the number of minutes to add during the summer-time 
period.
Range: 1 to 1440.
Default: 60 minutes.
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810 
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series










