date Command in Linux with Examples
date Command
The date command helps to view and set the system date and time in Linux machine. The date command allows you to see the several formats in date and time.
Syntax
date < options> < formats>
Display the date and time
The date command without using any option it will show you the system date and time. The day in abbreviate and month also abbreviates date in number and time format HH:MM:SS in IST and last in year.
Example
[root@linuxhelp ~]# date
Thu Feb 26 14:47:59 EST 2016
Display the date and time in specified format
The date command with +DATE this show you date in MM/DD/YY in the line one. The date command with using TIME this show you date in HH:MM:SS in the line second.
Example
[root@linuxhelp ~]# date " +DATE: %m/%d/%y%nTIME: %H:%M:%S"
DATE: 02/04/16
TIME: 15:07:17
Display the date and time using -r option
The date command with -R command will display the date and time in RFC 2822 format.
Example
[root@linuxhelp ~]# date -R
Thu, 04 Feb 2016 15:18:45 -0500
Display the date and time using -u option
The date command with -u option will display the date and time in coordinated universal time (UTC) time format.
Example
[root@linuxhelp ~]# date -u
Thu Feb 4 20:25:15 UTC 2016
Display date from string value
The date command with --date option will display the string value in date. You can give string value in many format like DD/MM/YYYY or in string format “ Mar 04 16” .
Example
[root@linuxhelp ~]# date --date=" 03/2/16"
Wed Mar 2 00:00:00 EST 2016
Display the date and time in string type
The date command with --date option will display the string value in date and also the time.
The before command will show only the date in string format but this command will display time also.
Example
[root@linuxhelp ~]# date --date=" Feb 4 2016 13:12:10"
Thu Feb 4 13:12:10 EST 2016
Display the relative date using -date option
This date command with using --date option will display the next on day of date. This is called Relative values it can use for see the future date.
Example
[root@linuxhelp ~]# date --date=" next mon"
Mon Feb 8 00:00:00 EST 2016
Display the date in convert seconds since the epoch (1970-01-01 utc) to a date
If string=@is given to date command then the date command convert seconds since the epoch (1970-01-01 UTC) to a date. If you want convert second in 30 you can run this command (date &ndash date=@30).
Example
[root@linuxhelp ~]# date --date=@10
Wed Jan 01 13:00:10 BST 1970
Display the date in past date
In this command will help you on see the time in 3 seconds before what time in. This command will help you also you can see the past date and time.
Example
The current time is
[root@linuxhelp ~]#date Thu Feb 4 16:51:49 SST 2016 [root@linuxhelp ~]# date --date=' 3 seconds ago' Thu Feb 4 16:51:46 SST 2016 [root@linuxhelp ~]# date --date=" 1 day ago" Tue Feb 3 16:58:37 SST 2016 [root@linuxhelp ~]# date --date=" yesterday" Wed Feb 3 16:59:38 SST 2016 [root@linuxhelp ~]# date --date=" 1 month ago" Wed Jan 4 17:00:46 SST 2016 [root@linuxhelp ~]# date --date=" 1 year ago" Thu Feb 4 17:01:43 SST 2015
Set date and time to using -set
You can set date and time of your system using -s or &ndash set option as shown below.
First check the current date using date command.
This command works only the root user.
Example
[root@linuxhelp ~]# date Thu Feb 4 17:07:01 SST 2016 And set the Date using set option. [root@linuxhelp ~]# date -s " Sun May 20 21:00:00 PDT 2017" And check the date again. [root@linuxhelp ~]# date Thu Feb 4 17:07:01 SST 2016 Sat May 20 17:00:00 SST 2017
Display the date version
This date command with --version or -V option will display the version details.
Example
[root@linuxhelp ~]# date -&ndash version
date (GNU coreutils) 8.4
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later < http://gnu.org/licenses/gpl.html> .
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by David MacKenzie.
To display the date help
This date command with --help option will display the user manual.
Example
[root@linuxhelp ~]# date --help
Usage: date [OPTION]... [+FORMAT]
or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
Display the current time in the given FORMAT, or set the system date.
-d, --date=STRING display time described by STRING, not `now'
-f, --file=DATEFILE like --date once for each line of DATEFILE
-r, --reference=FILE display the last modification time of FILE
-R, --rfc-2822 output date and time in RFC 2822 format.
Example: Mon, 07 Aug 2006 12:34:56 -0600
--rfc-3339=TIMESPEC output date and time in RFC 3339 format.
TIMESPEC=`date' , `seconds' , or `ns' for
date and time to the indicated precision.
Date and time components are separated by
a single space: 2006-08-07 12:34:56-06:00
-s, --set=STRING set time described by STRING
-u, --utc, --universal print or set Coordinated Universal Time
--help display this help and exit
--version output version information and exit
FORMAT controls the output. Interpreted sequences are:
%% a literal %
%a locale' s abbreviated weekday name (e.g., Sun)
%A locale' s full weekday name (e.g., Sunday)
%b locale' s abbreviated month name (e.g., Jan)
%B locale' s full month name (e.g., January)
%c locale' s date and time (e.g., Thu Mar 3 23:05:25 2005)
%C century like %Y, except omit last two digits (e.g., 20)
%d day of month (e.g, 01)
%D date same as %m/%d/%y
%e day of month, space padded same as %_d
%F full date same as %Y-%m-%d
%g last two digits of year of ISO week number (see %G)
%G year of ISO week number (see %V) normally useful only with %V
%h same as %b
%H hour (00..23)
%I hour (01..12)
%j day of year (001..366)
%k hour ( 0..23)
%l hour ( 1..12)
%m month (01..12)
%M minute (00..59)
%n a newline
%N nanoseconds (000000000..999999999)
%p locale' s equivalent of either AM or PM blank if not known
%P like %p, but lower case
%r locale' s 12-hour clock time (e.g., 11:11:04 PM)
%R 24-hour hour and minute same as %H:%M
%s seconds since 1970-01-01 00:00:00 UTC
%S second (00..60)
%t a tab
%T time same as %H:%M:%S
%u day of week (1..7) 1 is Monday
%U week number of year, with Sunday as first day of week (00..53)
%V ISO week number, with Monday as first day of week (01..53)
%w day of week (0..6) 0 is Sunday
%W week number of year, with Monday as first day of week (00..53)
%x locale' s date representation (e.g., 12/31/99)
%X locale' s time representation (e.g., 23:13:48)
%y last two digits of year (00..99)
%Y year
%z +hhmm numeric timezone (e.g., -0400)
%:z +hh:mm numeric timezone (e.g., -04:00)
%::z +hh:mm:ss numeric time zone (e.g., -04:00:00)
%:::z numeric time zone with : to necessary precision (e.g., -04, +05:30)
%Z alphabetic time zone abbreviation (e.g., EDT)
By default, date pads numeric fields with zeroes.
The following optional flags may follow `%' :
- (hyphen) do not pad the field
_ (underscore) pad with spaces
0 (zero) pad with zeros
^ use upper case if possible
# use opposite case if possible
After any flags comes an optional field width, as a decimal number
then an optional modifier, which is either
E to use the locale' s alternate representations if available, or
O to use the locale' s alternate numeric symbols if available.
Report date bugs to bug-coreutils@gnu.org
GNU coreutils home page: < http://www.gnu.org/software/coreutils/>
General help using GNU software: < http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils ' date invocation'