timedatectl 是 RHEL7 上的一个新功能。
它可用于查询和更改系统时钟及其设置。

1. 使用以下命令列出所有可用的时区。
   使用此命令，我们将获得一长串时区。

# timedatectl list-timezones
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
....

2. 找到我们需要的正确时区并设置特定时区。
   有一个名为 tzselect 的命令可以找到所需的时区。
   例如，要查找荷兰的时区，请按如下所示使用它：

# tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent or ocean.
 1) Africa
 2) Americas
 3) Antarctica
 4) Arctic Ocean
 5) Asia
 6) Atlantic Ocean
 7) Australia
 8) Europe
 9) Netherlandsn Ocean
10) Pacific Ocean
11) none - I want to specify the time zone using the Posix TZ format.
#? 5
Please select a country.
 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) Netherlands		  31) Myanmar (Burma)       48) Uzbekistan
15) Indonesia		  32) Nepal		    49) Vietnam
16) Iran		  33) Oman		    50) Yemen
17) Iraq		  34) Pakistan
#? 9
The following information has been given:
	China
Therefore TZ='Asia/Shanghai' will be used.
Local time is now:	Fri Apr 28 10:55:52 IST 2017.
Universal Time is now:	Fri Apr 28 05:25:52 UTC 2017.
Is the above information OK?
1) Yes
2) No
#? 
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/China

# timedatectl set-timezone Asia/Shanghai

3. 运行“date”命令以验证更改。

# date
Fri Apr 28 11:03:43 UTC 2017

我们也可以使用 timedatectl status 命令查看详细状态。

# timedatectl status
      Local time: Fri 2017-04-28 13:07:53 IST
  Universal time: Fri 2017-04-28 05:37:53 UTC
        RTC time: Fri 2017-04-28 05:37:53
       Time zone: Asia/Shanghai (UTC, +0530)
     NTP enabled: no
NTP synchronized: yes
 RTC in local TZ: no
      DST active: n/a