■RFC 2030—Simple Network Time Protocol (SNTP) (Version 4) for IPv4, IPv6,
and OSI (October 1996)
Setting the System Clock Manually
Before you set the system clock, obtain the following information about your time
zone:
â– The name of the time zone
â– The difference (offset) between the time zone and UTC
â– The dates and times of transitions to and from summer time (daylight saving
time)
â– The difference between the standard time and summer time (daylight saving
time)
The international website www.timeanddate.com contains information about time
zones.
NOTE: Be sure to set the time zone (default is UTC) and summer time dates before
you set the clock.
You can set the system clock at any time. This process involves the following steps:
1. Set the time zone.
2. Set the summer time dates.
3. Set the time.
4. Check the clock settings.
clock set
â– Use to set the time and date on your system manually.
â– Use the following syntax for setting the time: HH:MM:SS. This is the current time
in 24-hour format—hours:minutes:seconds.
â– There are two acceptable date forms for this command. Both produce the same
display when you run the show clock command.
â– Day:month:year
â– Month:day:year
â– Examples
host1#clock set 08:12:42 12 March 2000
host1#clock set 11:12:55 March 10 2000
â– There is no no version.
â– See clock set.
Setting the System Clock Manually â– 525
Chapter 10: Configuring the System Clock