今天在操作系统的时候创建了一个文件，ls了一下发现时间和本地时间不对，date看了一下后发现时区是EDT(Eastern Daylight Timing)指美国东部夏令时间)。时区这玩意，百年难得修改一次，几乎算是最不常用的操作了(除了运维NTP服务器的大神们)，记录一下。
代码语言：javascript复制[root@dbback ~]# date
Mon Mar 27 01:26:48 EDT 2017一、设置Centos系统的时区
输入命令： tzselect 依次输入：5)Asia → 9)china → 1)east China —BeiJing…. → 1)Yes
代码语言：javascript复制[root@dbback ~]# 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) Indian 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) Chinese 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.
Local time is now: Mon Mar 27 11:38:02 CST 2017.
Universal Time is now: Mon Mar 27 03:38:02 UTC 2017.
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二、替换Centos系统时区文件
代码语言：javascript复制[root@dbback ~]# date
Sun Mar 26 23:38:13 EDT 2017
[root@dbback ~]# cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime #设置中国时区的时间就选择Asia/Shanghai
cp: overwrite ‘/etc/localtime’? yes三、查看设置后Centos系统时间
代码语言：javascript复制[root@dbback ~]# date
Mon Mar 27 11:38:43 CST 2017
