Linux System Time Management

One, time zone configuration

Show Time zone

[Email protected] ~]# date-r

Mon, Dec 2016 14:02:47 +0800

[Email protected] ~]#

[Email protected] ~]# date +%z

+0800

[Email protected] ~]#

The main is the back of the +0800, East eight district

Modify Time Zone

[Email protected] ~]# Vim/etc/sysconfig/clock

[Email protected] ~]# Cat/etc/sysconfig/clock

Zone= "Asia/shanghai"

[Email protected] ~]# Cp/usr/share/zoneinfo/asia/shanghai/etc/localtime

Cp:overwrite '/etc/localtime '? Y

[Email protected] ~]#

The time zone information exists/usr/share/zoneinfo/below, the local time zone information exists/etc/localtime, using the TAB key technique, can modify the time zone arbitrarily.

Tzselect, interactive command, I tried useless effect, not recommended.

Second, time-related directives

Concept: There are 2 Linux time

System time: Also called software time (SYS), January 1, 1970 to the current time of the number of seconds

BIOS time: Also called hardware time (HC)

Display time:

[[Email protected] ~]# date 121914372015

Saturday, December 19, 2015 14:37:00 CST

[Email protected] ~]#

[Email protected] ~]# Hwclock-r

December 19, 2016 Monday 14:37 58 sec -0.523154 seconds

[Email protected] ~]#

[Email protected] ~]# hwclock-w

[Email protected] ~]# Hwclock-r

December 19, 2015 Saturday 14:37 29 sec -1.054204 seconds

[Email protected] ~]#

[Email protected] ~]#

Note:

Format the date:

#date mmddhhmmyyyy

MM: Month

DD: Date

HH: Hours

MM: Minutes

YYYY: The Public

#hwclock [RW]

-R: That is read, reading the current time parameters in the BIOS

-W: Write, writes the current Linux system time to the BIOS

Linux Web-time:

#ntpdate [NTP Ip/hostname]

For example:

#ntpdate time.windows.com

This article is from the "Behind" blog, make sure to keep this source http://laozhu.blog.51cto.com/755494/1883967

Linux System Time Management