View/modify the Linux time zone and time, and update the system time

I. Time Zone
1. view the current time zone
Date-R
2. Modify the time zone
Method (1) tzselect
Method (2) Limited to RedHat Linux and centos
Timeconfig
Method (3) applicable to Debian
Dpkg-reconfigure tzdata
3. Copy the corresponding time zone file to replace the system time zone file. Alternatively, create the link file CP/usr/share/zoneinfo/$ main Time Zone/$ Time Zone/etc/localtime
Available in China:
CP/usr/share/zoneinfo/Asia/Shanghai/etc/localtime

Ii. Time
1. view the time and date

Date

2. Set the time and date
Set the system date to the June 10, 1996 command date-s 06/22/96

Set the system time to 01:52:00 P.M..

3. Write the current time and date to the BIOS to prevent failure after restart
Hwclock-W

3. Scheduled synchronization time (added in/etc/crontab)

* ***/Usr/sbin/ntpdate 210.72.145.44>/dev/null 2> & 1

 

In addition:

1. manual synchronization:

Ntpdate 210.72.145.44 #210.72.145.44 provided by Xi'an Emy of Sciences

Ntpdate 219.158.14.130 # provided by Beijing Netcom

2. After synchronization, write the time information to the BIOS

Hwclock-W

3. For centos systems, use Yum install NTP to update ntpdate without the command;