Linux修改系统时间、时区

Linux修改系统时间、时区

查看现在时区

查看时区命令：date -R

root@ids:~# date -R
Wed, 08 Jul 2020 01:58:11 +0000

可以看到现在时区为+0000，北京时间时区应该是+0800，此时需要修改时区为北京时间

修改时区

修改时区命令：tzselect

root@ids:~# tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent, ocean, "coord", or "TZ".
 1) Africa
 2) Americas
 3) Antarctica
 4) Asia
 5) Atlantic Ocean
 6) Australia
 7) Europe
 8) Indian Ocean
 9) Pacific Ocean
10) coord - I want to use geographical coordinates.
11) TZ - I want to specify the time zone using the Posix TZ format.
#? 4
Please select a country whose clocks agree with yours.
 1) Afghanistan           18) Israel                35) Palestine
 2) Armenia               19) Japan                 36) Philippines
 3) Azerbaijan            20) Jordan                37) Qatar
 4) Bahrain               21) Kazakhstan            38) Russia
 5) Bangladesh            22) Korea (North)         39) Saudi Arabia
 6) Bhutan                23) Korea (South)         40) Singapore
 7) Brunei                24) Kuwait                41) Sri Lanka
 8) Cambodia              25) Kyrgyzstan            42) Syria
 9) China                 26) Laos                  43) Taiwan
10) Cyprus                27) Lebanon               44) Tajikistan
11) East Timor            28) Macau                 45) Thailand
12) Georgia               29) Malaysia              46) Turkmenistan
13) Hong Kong             30) Mongolia              47) United Arab Emirates
14) India                 31) Myanmar (Burma)       48) Uzbekistan
15) Indonesia             32) Nepal                 49) Vietnam
16) Iran                  33) Oman                  50) Yemen
17) Iraq                  34) Pakistan
#? 9
Please select one of the following time zone regions.
1) Beijing Time
2) Xinjiang Time
#? 1

The following information has been given:

        China
        Beijing Time

Therefore TZ='Asia/Shanghai' will be used.
Selected time is now:   Wed Jul  8 10:01:13 CST 2020.
Universal Time is now:  Wed Jul  8 02:01:13 UTC 2020.
Is the above information OK?
1) Yes
2) No
#? 1

You can make this change permanent for yourself by appending the line
        TZ='Asia/Shanghai'; export TZ
to the file '.profile' in your home directory; then log out and log in again.

Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Asia/Shanghai

此时已经把时区修改为北京时间，但是，还没有完成，还需要替换时区文件：

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

此时时区已经修改完成，查看现在时区：

root@ids:~# date -R
Wed, 08 Jul 2020 10:02:43 +0800

可以看到此时时区已经正确。

修改时间

命令：

date -s year-month-day 
date -s hour:minute:secord 

实际如下：

root@ids:~# date -s 2020-07-08
Wed Jul  8 00:00:00 CST 2020
root@ids:~# date -s 10:06:30
Wed Jul  8 10:06:30 CST 2020

此时时间还未修改完成，如果现在重启机器，时间依然会错乱，所以需要把系统时间写入硬件中，命令：hwclock -w
如下：

hwclock -w

此时时间已经修改完成。