RedHat Linux操作系统修改时区的方法

Most

modern Linux distributions have user-friendly programs to set the

timezone, often accesible through the program menus or right-clicking

the clock in a desktop environment such as KDE or GNOME. Failing that

it’s possible to manually change the system timezone in Linux in a few

short steps.

It’s possible to change the system timezone in Linux in a few short steps.

Steps

1.Logged

in as root, check which timezone your machine is currently using by

executing `date`. You’ll see something like “Mon 17 Jan 2005 12:15:08

PM PST -0.461203 seconds”, PST in this case is the current timezone.

2.Change

to the directory to /usr/share/zoneinfo, here you will find a list of

time zone regions. Choose the most appropriate region, if you live in

Canada or the US this directory is the “Americas” directory.

3.If

you wish, backup the previous timezone configuration by copying it to a

different location. Such as `mv /etc/localtime /etc/localtime-old`.

4.Create

a symbolic link from the appropiate timezone to /etc/localtime.

Example: `ln -s /usr/share/zoneinfo/Europe/Amsterdam /etc/localtime`.

5.If

you have the utility rdate, update the current system time by executing

`/usr/bin/rdate -s time.nist.gov`. (This step can be skip!)

6.Set the ZONE entry in the file /etc/sysconfig/clock file (e.g. “America/Los_Angeles”)

7.Set the hardware clock by executing: ` /sbin/hwclock –systohc`

Tips

·On

some versions of RedHat Linux, Slackware, Gentoo, SuSE, Debian, Ubuntu,

and anything else that is “normal”, the command to display and change

the time is ‘date’, not ‘clock’

·On

RedHat Linux there is a utility called “Setup” that allows one to

select the timezone from a list, but you must have installed the

‘redhat-config-date’ package.

Warnings

·Some applications (such as PHP) have separate timezone settings from the system timezone.

·On

some systems, /etc/localtime is actually a symlink to the appropriate

file under the /usr/share/zoneinfo directory (rather than a copy of

that file).

·On

some systems, there is a system utility provided that will prompt for

the correct timezone and make the proper changes to the system

configuration. For example,Debianprovides the “tzsetup” utility.

Here is an example of changing the timezone:(Logged in as root)

In order to manually change the timezone, you can edit the /etc/sysconfig/clockfile and then make a new soft link to /etc/localtime. Here is an example of changing the timezone manually to “America/Denver”:

1. Select the appropriate time zone from the /usr/share/zoneinfo directory. Time zone names are relative to that directory. In this case, we will select “America/Denver”

2. Edit the /etc/sysconfig/clocktext file so that it looks like this:

ZONE=”America/Denver”

UTC=true

ARC=false

Of course, this assumes that your hardware clock is running UTC time…

3. Delete the following file: /etc/localtime (backup it when you need it !)

4. Create a new soft link for /etc/localtime. Here is an example of step 3 and step 4:

# cd /etc

# ls -al localtime

lrwxrwxrwx 1 root root 39 Mar 28 07:00 localtime -> /usr/share/zoneinfo/America/Los_Angeles

# rm /etc/localtime

# ln -s /usr/share/zoneinfo/America/Denver /etc/localtime

# ls -al localtime

lrwxrwxrwx 1 root root 34 Mar 28 08:59 localtime -> /usr/share/zoneinfo/America/Denver

# date

Fri Mar 28 09:00:04 MST 2003

针对中国时区，修改操作如下

1.   修改文件 /etc/sysconfig/clock内容：

ZONE=Asia/Shanghai

UTC=false

ARC=false

2.     rm /etc/localtime

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

还有其他方法修改时区，不过是基于图形化界面的命令： tzselect 、 timeconfig