1、查看时区
+0800代表的就是中国的时区
[root@linux ~]# date -R
Wed, 19 Feb 2020 18:00:31 +0800
2、同步时间
直接在网上搜索NTP服务器
阿里云的NTP服务器：ntp1.aliyun.com
使用ntp工具同步时间
[root@linux ~]# yum -y install ntpdate
[root@linux ~]# ntpdate ntp1.aliyun.com
19 Feb 18:11:38 ntpdate[3580]: step time server 120.25.115.20 offset -1.606375 sec
如果时区错误：
[root@linux ~]# date -R
Mon, 20 Nov 2017 19:33:48 -0800 --这是查看为错误的因为中国时间为亚洲+0800才对
如果要修改时区，执行sudo tzselect
选择区域：亚洲
[root@linux ~]# sudo 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) Arctic Ocean
5) Asia
6) Atlantic Ocean
7) Australia
8) Europe
9) Indian Ocean
10) Pacific Ocean
11) coord - I want to use geographical coordinates.
12) TZ - I want to specify the time zone using the Posix TZ format.
#? 5
选择国家：中国
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
选择时区：北京时间
Please select one of the following time zone regions.
1) Beijing Time
2) Xinjiang Time
#? 1
确认验证：
The following information has been given:
China
Beijing Time
Therefore TZ='Asia/Shanghai' will be used.
Local time is now: Tue Nov 21 11:34:46 CST 2017.
Universal Time is now: Tue Nov 21 03:34:46 UTC 2017.
Is the above information OK?
1) Yes
2) No
#? 1
复制文件到/etc目录下
[root@linux ~]# cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
更新时间
[root@linux ~]# yum -y install ntpdate
[root@linux ~]# ntpdate ntp1.aliyun.com
