linux系统时间命令


查看和修改Linux的时区

1.查看当前时区

date -R

2.修改设置Linux服务器时区
2.1.方法1:

tzselect

2.2.仅限于RedHat Linux 和 CentOS

timeconfig

2.3.适用于Debian

dpkg-reconfigure tzdata

3.复制相应的时区文件,替换系统时区文件;或者创建链接文件

cp /usr/share/zoneinfo/$主时区/$次时区 /etc/localtime

例如:在设置中国时区使用亚洲/上海(+8)

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

时区设置相关信息:

[root@Minimall ~]# tzselect 
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:  Thu Oct  5 23:54:42 CST 2017.
Universal Time is now:  Thu Oct  5 15:54:42 UTC 2017.
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
[root@Minimall ~]#

查看和修改Linux的时间

1.查看时间和日期

date

2.设置时间和日期

# 将时间设置为11点23分10秒
[root@Minimall ~]# date -s 11:23:10
# 将日期设置为2017年10月5日
[root@Minimall ~]# date -s 10/05/2017
# 将时间设置为2017年10月5日11点38分30秒(MMDDhhmmYYYY.ss)
[root@Minimall ~]# date 1005113817.30
Thu Oct  5 11:38:30 EDT 2017
[root@Minimall ~]# date 100511402017.20
Thu Oct  5 11:40:20 EDT 2017

3.将当前时间和日期写入BIOS,避免重启后失效

hwclock -w

注:date不加参数可以直接看到当前日期时间
cal:不加参数可以直接看到本月月历

参考地址:
https://www.cnblogs.com/ljy2013/p/4615149.html
https://www.jianshu.com/p/ba3bf5f3ee0a