Change the Time Zone Settings on the Cisco Switch

To change the time zone setting on the Cisco switch:

Use Telnet to connect to the Cisco switch as the root user.
Use the enable command to enter privileged mode.
Use the configure terminal command to begin configuration.
Set the clock using the following command:
```
clock timezone zone hours_offset [minutes_offset]
```
In the preceding command, zone is the name of the time zone to be displayed when standard time is in effect, hours_offset is the hours offset from UTC, and minutes_offset are the minutes offset from UTC. The default time zone is UTC.

To set summer time (daylight savings time), use the following command:
```
clock summer-time zone recurring [week day month hh:mm week day month   \
      hh:mm [offset]]
```
In the preceding command, week is the week of the month, between 1 to 5, day is the day of the week, such as Sunday or Monday, month is the month, such as January or June, hh:mm is the time in 24-hour format, and offset is the number of minutes to add during summer time. The default for hh:mm is 60. Summer time is disabled by default.

The following is an example of setting the time zone to US Eastern time with summer time enabled:
```
$ telnet raeth-ip
Connected to raeth-ip
Escape Character is 'CTRL+]'

User Access Verification

Password: password
raeth-ip> enable
Password: password
raeth-ip# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
raeth-ip(config)# clock timezone EST -5
raeth-ip(config)# clock summer-time EDT recurring
raeth-ip(config)# end
raeth-ip# write memory
Building configuration...
Compressed configuration from 6421 bytes to 2041 bytes[OK]
raeth-ip# show clock
12:03:43.516 EDT Wed May 12 2012
```