时区设置

约定不等于承诺〃 2022-05-25 00:19 467阅读 0赞

时区 设置 Linux 运维以及脚本干货: 欢迎分享，欢迎folk, 欢迎留言  
[https://unnunique.github.io/AADocs/skill-docs/linux/][https_unnunique.github.io_AADocs_skill-docs_linux]  
[https://github.com/unnunique/unnunique.github.io/blob/master/AADocs/skill-docs/linux/index.md][https_github.com_unnunique_unnunique.github.io_blob_master_AADocs_skill-docs_linux_index.md]

### 时区理解 ###

*  其实初中地理课已经涉及，很多人都多少了解一些，可能只是细节搞不太清楚。为什么会将地球分为不同时区呢？  
    因为地球总是自西向东自转，东边总比西边先看到太阳，东边的时间也总比西边的早。东边时刻与西边时刻的差值不仅要以时计，  
    而且还要以分和秒来计算。整个地球分为二十四时区，每个时区都有自己的本地时间。在国际无线电通信场合，为了统一起见，  
    使用一个统一的时间，称为通用协调时(UTC, Universal Time Coordinated)。(GMT, Greenwich Mean Time)一样，都与英国伦敦的本地时相同。

### 查看时区 ###

*  Date -R 或者， more /etc/sysconfig/clock

root@hello:/home # date -R 
    Fri, 13 Jan 2017 15:11:12 +0800
    
    root@hello:/home # more  /etc/sysconfig/clock
    ## Path: System/Environment/Clock
    ## Description: Information about your timezone and time
    ## Type: string(-u,--utc,--localtime)
    ## ServiceRestart: boot.clock
    ## Command: /sbin/refresh_initrd
    #
    # Set to "-u" if your system clock is set to UTC, and to "--localtime"
    # if your clock runs that way.
    #
    HWCLOCK="-u"
    ## Type: yesno
    ## Default: yes
    ## Description: Write back system time to the hardware clock
    #
    # Is set to "yes" write back the system time to the hardware
    # clock at reboot or shutdown. Usefull if hardware clock is
    # much more inaccurate than system clock. Set to "no" if
    # system time does it wrong due e.g. missed timer interrupts.
    # If set to "no" the hardware clock adjust feature is also
    # skipped because it is rather useless without writing back
    # the system time to the hardware clock.
    #
    SYSTOHC="yes"
    ## Type: string(Europe/Berlin,Europe/London,Europe/Paris)
    ## ServiceRestart: boot.clock
    #
    # Timezone (e.g. CET)
    # (this will set /usr/lib/zoneinfo/localtime)
    #
    TIMEZONE="Asia/Shanghai"
    DEFAULT_TIMEZONE="US/Eastern"

### 修改时区,3种方法， ###

*  1,tzselect, 设置环境变量，export TZ=’Asia/Shanghai’ ,source /etc/profile.
 *  2,cp /usr/share/zoneinfo/America/Los\_Angeles /etc/localtime
 *  3,ln /usr/share/zoneinfo/Asia/Shanghai /etc/localtime ，报错的话，rm /etc/localtime,  
    之后 ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
 *  4，如果是，Rehat 或者centOS 可以用timeconfig 设置。

### profile设置TZ=TZ=’Asia/Shanghai’ ###

[https_unnunique.github.io_AADocs_skill-docs_linux]: https://unnunique.github.io/AADocs/skill-docs/linux/
[https_github.com_unnunique_unnunique.github.io_blob_master_AADocs_skill-docs_linux_index.md]: https://github.com/unnunique/unnunique.github.io/blob/master/AADocs/skill-docs/linux/index.md