1.购买了VPS，CentOS系统，发现服务器时间与北京时间往往不一致，存在时差。

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[clive@server workspace]$ date
2018年 05月 30日 星期三 02:02:47 UTC

1.可以执行tzselect命令按提示更换时区，依次选择5-Asia，9-China，1-Beijing Time。

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: Wed May 30 10:04:16 CST 2018.
Universal Time is now: Wed May 30 02:04:16 UTC 2018.
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

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