The date command in Linux

The data command displays and changes the system time

Date Syntax and parameters:

Date [OPTION] ... [+format]

Date [-u|--utc|--universal] [MMDDHHMM[[CC]YY][.SS]]

Parameters	Words	Description
-S	Set	Setting the system time
-D	Date	Specify display time

Time Format:

Time format	Words	Example	Format description
%F	Year-month-day	2014-11-12	Year-month-day
%T	Hour-minute-second	14:28:30	Hours-minutes-seconds
%Y	Year	2014	Years
%y	Year	14	Year (the last two digits of the year)
%m	Month	11	Month
%d	Day	12	Day
%H	Hour	14	When
%M	Minute	28	Score of
%s	Second	30	Seconds
%s	Second		From 1970-01-01 onwards
%w	Week	2	Week

Date Example:

[[Email protected] ~]$ Date

Wednesday, November 12, 2014 14:31:29 CST

Description: Displays the current system time

[[Email protected] ~]# date- s 2012-11-13

November 13, 2012 Tuesday 00:00:00 CST

Description: Set the system time

[Email protected] ~]# Hwclock- w

[Email protected] ~]# Hwclock

January 09, 1990 Tuesday 00:00 15 sec -0.924544 seconds

Description: Hwclock-w is synchronizing the time to the BIOS

[Email protected] ~]# ntpdate time.windows.com

14:52:17 ntpdate[2298]: Step time server 64.4.10.33 offset 783960574.614420 sec

[[Email protected] ~]# Date

Wednesday, November 12, 2014 14:52:23 CST

[[email protected] ~]# hwclock-w sync time to BIOS

Description: Resynchronize the time to the current time

[Email protected] ~]# date +%f-%t

2014-11-12-14:54:39

Description: Display date year-month-day time-minute-second

[Email protected] ~]# date +%d

11/12/14

[Email protected] ~]# date +%w

45

Description: 45 for the 45th week of this year

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

2014-11-15

Description: Three days after the time

[[Email protected] ~]# Date +%f-d '-3 day '

2014-11-09

Description: Three days before the time

[[Email protected] ~]# Date +%f-%t-d '-3 hour '

2014-11-12-12:01:03

Description: Three hours before the time

[[Email protected] ~]# Date +%f-%t-d ' 3 hour '

2014-11-12-18:01:07

Description: Three hours after the time

Note: For accurate time, the preceding output must be complete +%f-%t

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The date command in Linux