Cisco Systems MDS 9020 manual Adjusting for Daylight Saving Time

Chapter 3 Initial Configuration

Configuring Date and Time

Se n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a ck - d o c @ c i s c o . c o m

Adjusting for Daylight Saving Time

Following U.S. standards, the switch can advance the clock one hour at 2:00 a.m. on the first Sunday in April and move the clock back one hour at 2:00 a.m. on the last Sunday in October. You can also explicitly specify the start and end dates and times, and you can specify whether or not the time adjustment recurs every year.

To enable the daylight saving time clock adjustment according to the U.S. rules, perform this task:

	Command	Purpose
Step 1
	switch# config t	Enters configuration mode.
Step 2
	switch(config)# clock timezone	Offsets the time zone as specified.
	timezone_name hour_offset_from_UTC
	minute_offset_from_UTC	This example sets the Pacific standard offset time as
	Example:	negative 8 hours and 0 minutes.
	switch(config)# clock timezone PST -8 0
	switch(config)# no clock timezone	Disables the time zone adjustment feature.
Step 3
	switch(config)# clock summer-time	Sets the daylight savings time for a specified time
	daylight_timezone_name start_week	zone.
	start_day start_month start_time end_week	The start and end values are as follows:
	end_day end_month end_time
	daylight_offset_inminutes	• Week ranging from 1 through 5
		• Day ranging from Sunday through Saturday
		• Month ranging from January through
		December
		The daylight offset ranges from 1 through 1440
	Follow this example:	minutes, which are added to the start time and
		deleted time from the end time.
	switch(config)# clock summer-time PDT 1	This example adjusts the daylight savings time for
	Sun Apr 02:00 5 Sun Oct 02:00 60
		the Pacific daylight time by 60 minutes, starting the
	switch(config)#
		first Sunday in April at 2 a.m. and ending the last
		Sunday in October at 2 a.m.
	switch(config)# no clock summer-time	Disables the daylight saving time adjustment
		feature.
Step 4
	switch(config)# exit	Returns to EXEC mode.
	switch#
Step 5
	switch# show clock	Verifies the time zone configuration.

Cisco MDS 9020 Fabric Switch Configuration Guide and Command Reference

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