Show/Set system time in Linux

Date display/Set system time

+ A format displays dates in some format

Format: +%f 2017-08-20 ====== +%y-%m-%d

+%w Show weeks 0 Sunday 1-6 weeks one to Saturday

+%t: minutes: Seconds ====== +%h:%m:%s

-D Displays the date according to your description

-D "1day" after 1 days = = +1day

-D " -1day" 1 days ago

-s time to modify the system

1.1 Commands to modify the system time

ntpdatepool.ntp.org

Ntpdatentp1.aliyun.com

1.2 Use of date

Example 1-1

[Email protected] ~]# date-d " -3day"

Thu Jul 16:32:09 CST 2017

Example 1-2

[Email protected] ~]# date-d "3day"

Wed 216:32:19 CST 2017

Example 1-3

[Email protected] ~]# date-d " -3day" +%f

2017-07-27

Example 1-4

[Email protected] ~]# date-d " -3year" +%f

2014-07-30

Example 1-5

[Email protected] ~]# date-d " -300year" +%f

1717-07-30

[Email protected]~]# # #day

[Email protected]~]# #year Month Day hour min sec

Example 1-6

[Email protected] ~]# date +%t

12:31:54

[Email protected] ~]# date +%h:%m:%s

12:32:1501734744

[Email protected] ~]# date +%h:%m:%s

12:32:28

1.3 # # # #显示十天之前的日期 Format: 2017-07-30_0 year-month-day _ weeks

[[Email protected] ~]# date +%f_%w-d " -10day"

2017-07-24_1

1.4 Setting the time problem

1.4.1 Question 1

[Email protected] ~]# ntpdate pool.ntp.org

Exiting, name server cannot is used:temporary failure in name resolution (-3)

Domain name resolution server (DNS) cannot be used: Domain Name resolution failed

3 12:10:02 ntpdate[3345]: name servercannot be used:temporary failure in name resolution (-3)

1.4.2 Workaround

# # # #1. pingwww.baidu.com

# #报错域名-----Can't change to an IP address

# # # #2. Ping 223.5.5.5

# #排查是否真的是dns的问题

# # # #3. If it is a DNS problem, modify the NIC's configuration file plus

dns1=223.5.5.5

dns2=223.6.6.6

[Email protected] ~]# Cat/etc/sysconfig/network-scripts/ifcfg-eth0

# # # #4. Effective

/etc/init.d/network restart

This article is from the "Heyong" blog, make sure to keep this source http://heyong.blog.51cto.com/13121269/1954918

Show/Set system time in Linux