1. CentOS系统，发现服务器时间与北京时间往往不一致，存在时差。

> date

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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.

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? 选 Asia, CentOS里序号5，aliyunOS里序号4

Please select a country.

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? 选 China，序号一般是 9

Please select one of the following time zone regions.

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选 Beijing 序号1

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选 Yes 序号 1

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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

后续步骤

1.将TZ='Asia/Shanghai'; export TZ这行添加到/etc/profile（所有用户生效）或者~/.bash_profile（当前用户生效）

2.退出重新登录即可，也可执行source /etc/profile或source ~/.bash_profile立即生效

3.这时候再执行date查看日期就可以发现时区改为北京时间啦。