Linux日期和时间

Linux日期和时间

Linux的两种时钟

• 系统时钟：由Linux内核通过CPU的工作频率进行的
• 硬件时钟：主板

相关命令：

1. date [OPTION]... [+FORMAT]

   # %F   full date; like %+4Y-%m-%d
   root@admin:~# date +%F
   2022-11-19
   
   # %T   time; same as %H:%M:%S
   root@admin:~# date +%T
   18:47:01
   
   # %s   seconds since 1970-01-01 00:00:00 UTC
   root@admin:~# date +%s
   1668883828
   root@admin:~# date -d @`date +%s`     #`date +%s`表示该指令运行后的值
   Sat Nov 19 06:50:52 PM UTC 2022
   root@admin:~# date -d @1668883828
   Sat Nov 19 06:50:52 PM UTC 2022
   
   root@admin:~# date +%F_%H-%M-%S
   2022-11-20_03-17-28
   

2. hwclock

   -s, --hctosys 以硬件时钟为准，校正系统时钟

   -w, --systohc 以系统时钟为准，校正硬件时钟

3. 查看或修改时区：timedatectl

   root@admin:~# timedatectl list-timezones
   Africa/Abidjan
   Africa/Accra
   Africa/Addis_Ababa
   ...
   
   
   root@admin:~# timedatectl set-timezone Asia/Shanghai
   
   
   root@admin:~# timedatectl status
                  Local time: Sun 2022-11-20 02:57:26 CST
              Universal time: Sat 2022-11-19 18:57:26 UTC
                    RTC time: Sat 2022-11-19 18:57:26
                   Time zone: Asia/Shanghai (CST, +0800)
   System clock synchronized: yes
                 NTP service: active
             RTC in local TZ: no
   

4. 查看时区： /etc/localtime

5. 日历 cal

   [root@host1 ~]# cal
       November 2022   
   Su Mo Tu We Th Fr Sa
          1  2  3  4  5
    6  7  8  9 10 11 12
   13 14 15 16 17 18 19
   20 21 22 23 24 25 26
   27 28 29 30
   
   [root@host1 ~]# cal 1 1997
       January 1997  
   Su Mo Tu We Th Fr Sa
             1  2  3  4
    5  6  7  8  9 10 11
   12 13 14 15 16 17 18
   19 20 21 22 23 24 25
   26 27 28 29 30 31
   

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