One, time zone
Show Time zone
Date--help Get help
Date-r
Date +%z
All of the above two commands can be
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- [Email protected] ~]# date-r; Date +%z
- Fri, Oct 2012 23:34:27 +0800
- +0800
[Email protected] ~]# date-r; Date +%zfri, Oct 2012 23:34:27 +0800+0800
The main is the back of the +0800, East eight district
Modify Time Zone
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- Cp/usr/share/zoneinfo/asia/shanghai/etc/localtime
Cp/usr/share/zoneinfo/asia/shanghai/etc/localtime
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, but it seems to be not very good, or use the above bar.
Second, time
Concept: Linux time has two
System time: Also called software time (SYS), January 1, 1970 to the current time of the number of seconds
Bois time: Also called hardware time (HC)
Show time
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- [Email protected] ~]# Date;hwclock-r
- Friday, October 19, 2012 23:39:44 CST
- October 19, 2012 Friday 23:39 45 sec -0.317993 seconds
[[email protected] ~]# date;hwclock-r2012 October 19 Friday 23:39:44 CST2012 year October 19 Friday 23:39 45 seconds -0.317993 seconds
Set the time
1, Date-s
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- Date-s 20121019
Date-s 20121019
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- Date-s 23:40:00
Date-s 23:40:00
You can use this without a network.
2, Ntpdate
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- Ntpdate time.windows.com && hwclock-w
Ntpdate time.windows.com && hwclock-w
Network update time, if successful, will system time, write Bois
Hwclock-w or Hwclock--SYSTOHC
Can do crontab.
3, start the NTPD service, opened after 2 can not be used.
Update with Ntpdate first, make sure time is not too different
Rpm-qa | grep NTP #查询一下可安装了
Chkconfig--list | grep NTP #看下服务情况
CHKCONIFG ntpd on
Service ntpd start or/etc/init.d/ntpd start
If necessary, set the/etc/ntp.conf, and then reload the service.
The knowledge of NTP refer to the server chapter of Brother Bird.
CentOS 6th time, time zone, settings modification and time synchronization