但是我上次也是这样修改的。那么过段时间肯定又会出现时差，所以得找出真正的原因，问了一个老系统工程师才知道其中的原因。
看见上面红色的-0500
吗？它应该是美国地区的，西-5时区。
而我们中国一般设置的都是以东时区，Linux里面一般出现的有：北京，上海，香港
。举例上海的就是+0800
[root@BIAPP ~]# date -R
Fri, 12 Dec 2014 11:31:20

• [root@BIAPP ~]#) 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.
• #?--- 亚洲的英文是Asia 别搞错了啊。
• 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
• ) 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) east China - Beijing, Guangdong,
  Shanghai, etc.
• 2) Heilongjiang (except Mohe), Jilin
• 3) central China - Sichuan, Yunnan,
  Guangxi, Shaanxi, Guizhou,
  etc.
• 4) most of Tibet & Xinjiang
• 5) west Tibet & Xinjiang
• #? 1
• The following information has been given:
• China
• east China - Beijing,
  Guangdong, Shanghai, etc.
• Therefore TZ=\'Asia/Shanghai\' will be used.
• Local time is now: Sat Dec 13 00:59:53 CST 2014.
• Universal Time is now: Fri Dec 12 16:59:53 UTC 2014.
• Is the above information OK?
• 1) Yes
• 2) No
• #? =\'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
• [root@bidevelop4
  ~]#
• [root@BIAPP ~]# export TZ=\'Asia/Shanghai\'    ---这里其实可以写到.bash_profile里面