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.
 ) Africa
 ) Americas
 ) Antarctica
 ) Arctic Ocean
 ) Asia
 ) Atlantic Ocean
 ) Australia
 ) Europe
 ) Indian Ocean
) Pacific Ocean
) none - I want to specify the time zone using the Posix TZ format.
#?
Please select a country.
 ) Afghanistan          ) Israel            ) Palestine
 ) Armenia          ) Japan            ) Philippines
 ) Azerbaijan          ) Jordan            ) Qatar
 ) Bahrain          ) Kazakhstan        ) Russia
 ) Bangladesh          ) Korea (North)        ) Saudi Arabia
 ) Bhutan          ) Korea (South)        ) Singapore
 ) Brunei          ) Kuwait            ) Sri Lanka
 ) Cambodia          ) Kyrgyzstan        ) Syria
 ) China          ) Laos            ) Taiwan
) Cyprus          ) Lebanon            ) Tajikistan
) East Timor          ) Macau            ) Thailand
) Georgia          ) Malaysia            ) Turkmenistan
) Hong Kong          ) Mongolia            ) United Arab Emirates
) India          ) Myanmar (Burma)        ) Uzbekistan
) Indonesia          ) Nepal            ) Vietnam
) Iran          ) Oman            ) Yemen
) Iraq          ) Pakistan
#?
Please select one of the following time zone regions.
) Beijing Time
) Xinjiang Time
Please enter a number in range.
#? 

The following information has been given:

    China
    Beijing Time

Therefore TZ='Asia/Shanghai' will be used.
Local time is now:    Thu May   :: CST .
Universal Time is now:    Thu May   :: UTC .
Is the above information OK?
) Yes
) 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;

*/ * * * * 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