Linux 修改本地时间 (centos为例)

1. tzselect

[root@xxxx etc]# tzselect     --- 选择时区命令
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) 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
Please enter a number in range.
#? 1

The following information has been given:

    China
    Beijing Time

Therefore TZ='Asia/Shanghai' will be used.
Local time is now:    Thu May  4 17:15:04 CST 2017.
Universal Time is now:    Thu May  4 09:15:04 UTC 2017.
Is the above information OK?
1) Yes
2) No

　　　　即可重新加载本地时间

　　date 查看本地时间

2. 修改本地 localtime 文件

查看/usr/share/zoneinfo 文件夹，发现全部为地区时间文件

故:　　

rm -rf /etc/localtime
ln -s /usr/share/zoneinfo/Asia/Shanghai  /etc/lcoaltime

date 查看时间，变为上海东八区时间

3. ntpdate & ntpd

　　yum -y install ntpdate ntp

同步在线网络s

　　ntpdate xxxx

crontab: 没十分钟调整一次时间;

*/10 * * * * ntpdate time.nist.gov   #域名或IP

　　一级时间服务器列表：http://support.ntp.org/bin/view/Servers/StratumOneTimeServers

　　二级时间服务器列表：http://support.ntp.org/bin/view/Servers/StratumTwoTimeServers