更改linux时间

[test@a19 profile.d]$ date
Tue Mar 17 04:54:22 EDT 2015
[test@a19 profile.d]$ su root
Password: 
[root@a19 profile.d]#  cp  /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
cp: overwrite `/etc/localtime'? y
[root@d169 profile.d]# date
Tue Mar 17 17:03:13 CST 2015

[root@a19 profile.d]# 

当然也可以使用一下方法：

[test@a19 profile.d]# 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) 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: Tue Mar 17 17:06:00 CST 2015.
Universal Time is now: Tue Mar 17 09:06:00 UTC 2015.
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
[test@a19 profile.d]# date
Tue Mar 17 17:06:05 CST 2015
[test@a19 profile.d]#