 |
Hummingbird Computing
|
|
|
|
Changing
the System Date and Time Use the date command to set the date and
time. For example, to set the date to April 1st, 1999, and the time to
09:00, log in as root and enter:
Changing the date and time on a running
system can have unexpected consequences. Users and administrators use
system scheduling utilities (at, cron, and batch) to perform commands at
specified times. If you change the effective date or time on the system,
these commands may not execute at the desired times. Similarly, if your
users use the make utility provided with the system, the commands
specified in Makefiles may perform incorrectly. Always try to keep your
system date and time accurate within reason. Random changes of the date and
time can be extremely inconvenient and possibly destructive to users’
work. If timed is running on the system, and it
is a slave system, the time is reset by timed and not the date command.
For more information, see the timed(1M) reference page. Setting
the Time Zone To set the time zone of the system, edit
the file /etc/TIMEZONE. For a site on the east coast of the United States,
the file might look something like this:
The line TZ=EST5EDT
means: The current time zone is Eastern Standard
Time.
The TZ environment variable is read by
init(1) when the system boots, and the value of TZ is passed to all
subsequent processes. The time zone designation (such as EST) is simply
passed through for your convenience. The important parts of the
designation are the specification of the deviation from Greenwich Mean
Time and the presence of the daylight savings time indicator.
|
Send mail to jokeefe@hummingbirdcomp.com
with questions or comments about this web site. |
