122

How to change the system date in Linux ?

I want to change:

  • Only Year
  • Only Month
  • Only Date
  • Any combination of above three
2
  • 4
    You can use e.g. date --set='-2 years' to set the clock back two years, leaving all other elements identical. You can change month and day of month the same way. I haven't checked what happens if that calculation results in a datetime that doesn't actually exist, e.g. during a DST switchover, but the behaviour ought to be identical to the usual "set both date and time to concrete values" behaviour. Commented Sep 29, 2017 at 9:47
  • Assuming you're trying to set the date to the current time, you could do sudo ntpd -gq to have the system update automatically using the ntp service. Commented Mar 23, 2018 at 21:20

7 Answers 7

153

Use date -s:

date -s '2014-12-25 12:34:56'

Run that as root or under sudo. Changing only one of the year/month/day is more of a challenge and will involve repeating bits of the current date. There are also GUI date tools built in to the major desktop environments, usually accessed through the clock.

To change only part of the time, you can use command substitution in the date string:

date -s "2014-12-25 $(date +%H:%M:%S)"

will change the date, but keep the time. See man date for formatting details to construct other combinations: the individual components are %Y, %m, %d, %H, %M, and %S.

10
  • I don't want to change the time
    – SHW
    Commented Aug 22, 2014 at 9:51
  • 7
    There's no option to do that. You can use date -s "2014-12-25 $(date +%H:%M:%S)" to change the date and reuse the current time, though. Commented Aug 22, 2014 at 9:55
  • came here and hours as well as minutes were matching current time. – nice
    – Alex2php
    Commented Mar 30, 2018 at 10:36
  • 3
    date: cannot set date: Invalid argument Commented Aug 2, 2018 at 16:17
  • @MichaelHomer @SHW it is possible to change only the date with a command like date -s 2018-01-01. Someone shared this in an answer also: superuser.com/questions/870068/…
    – baptx
    Commented Oct 4, 2018 at 14:15
60

System time

You can use date to set the system date. The GNU implementation of date (as found on most non-embedded Linux-based systems) accepts many different formats to set the time, here a few examples:

set only the year:

date -s 'next year'
date -s 'last year'

set only the month:

date -s 'last month'
date -s 'next month'

set only the day:

date -s 'next day'
date -s 'tomorrow'
date -s 'last day'
date -s 'yesterday'
date -s 'friday'

set all together:

date -s '2009-02-13 11:31:30' #that's a magical timestamp

Hardware time

Now the system time is set, but you may want to sync it with the hardware clock:

Use --show to print the hardware time:

hwclock --show

You can set the hardware clock to the current system time:

hwclock --hctosys

Or the system time to the hardware clock

hwclock --systohc
2
  • 3
    Bonus points for illustrating the non-obvious ways you can set the date with examples and for pointing out the difference between the "system time" and the "hardware clock". Very helpful answer! Commented Oct 6, 2016 at 2:17
  • I think you confused hctosys and systohc. hctosys means "Set system time from hardware clock" and systohc means "Set hardware clock from system time".
    – itaych
    Commented Apr 12, 2022 at 9:45
11

The command to to change the system date is date.

There are two ways to call the date command(in Linux):

   date [OPTION]... [+FORMAT]
   date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

Easy

The easiest way is to use date -s as it allows the use of simple relative dates

 $ date -s yesterday; date
 date: cannot set date: Operation not permitted
 Sat Jan  5 07:21:07 EST 2019
 Sun Jan  6 07:21:07 EST 2019

The date did not change because it was executed with a limited user $. If you actually want the date changed, use root (#) or sudo:

 $ sudo date -s yesterday; date
 Sat Jan  5 07:21:07 EST 2019
 Sat Jan  5 07:21:07 EST 2019

So, changing any part of a relative date is as easy as naming it:

 $ date -s "5 years ago"
 Mon Jan  6 08:26:26 EST 2014

 $ date -s "+6 months"
 Sat Jul  6 08:28:39 EDT 2019

 $ date -s "+3 hours -13 minutes"
 Sun Jan  6 11:16:59 AST 2019

Absolute dates are a bit more complex as they need more detail:

 $ date -s "2001-07-23 10:11:12"

Or, you can use the date command twice:

 $ date -s "$(date +'%Y-%m-%d %H:%M:%S')"

replace any of the % by a valid value and the date will be set (only as root).

 $ date -s "$(date +'%Y-11-%d %H:%M:%S')"
 Wed Nov  6 08:37:15 EST 2019

direct

The second date call form is used to directly change the system date.

 date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

So :

 date 11230812              # MMDDhhmm

Will set the date to the 23th of November at 08h and 12min.

BSD has a similar command but a different format ([[[[[cc]yy]mm]dd]HH]MM[.ss]).

Try date as a limited user to see what it would do (without changing anything):

 $ date 11230812
 date: cannot set date: Operation not permitted
 Sat Nov 23 08:12:00 EST 2019

Or, if you actually want to change the date, as root:

 # date 11230812
 # date
 Sat Nov 23 08:12:00 EST 2019

Note that services like NTP or chrony will be affected. And, if restarted will reset the date back to the real one.

Add a YY to set the year:

 $ date 1123081222
 date: cannot set date: Operation not permitted
 Wed Nov 23 08:12:00 EST 2022

Or a CCYY to set year and century:

 $ date 112308121982
 date: cannot set date: Operation not permitted
 Tue Nov 23 08:12:00 EST 1982
6

You change the date with the date command. However, the command expects a full date as the argument:

# date -s "20141022 09:45"
Wed Oct 22 09:45:00 BST 2014

To change part of the date, output the current date with the date part that you want to change as a string and all others as date formatting variables. Then pass that to the date -s command to set it:

# date -s "$(date +'%Y12%d %H:%M')"
Mon Dec 22 10:55:03 GMT 2014

changes the month to the 12th month - December.

The date formats are:

  • %Y - Year
  • %m - Month
  • %d - Day
  • %H - Hour
  • %M - Minute
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  • I try to change but its not changing:- $ sudo date --set="2015-09-30 10:05:59.990" Wed Sep 30 10:05:59 +0530 2015 $ date Thu May 23 15:10:37 +0530 2019
    – Vinod
    Commented May 23, 2019 at 9:58
3

As of December 2022:

You may disable NTP sync before actual date change:

sudo timedatectl set-ntp 0
sudo timedatectl set-time "2022-12-03 $(date +%H:%M:%S)"

When date modification is no longer necessary, you should enable NTP sync again to auto update system date:

sudo timedatectl set-ntp 1
2
  • This applies only to installations that use systemd. Also, once you turn off ntp, you can still just use the date command to set the date if needed (depending on the purpose). Commented Feb 17, 2023 at 23:07
  • 2
    This saved me some time while debugging issues in Ubuntu 22.04. Thank you!
    – Machado
    Commented Mar 20, 2023 at 18:48
2

For ones like me running ESXI 5.1, here's what the system answered me

~ # date -s "2016-03-23 09:56:00"
date: invalid date '2016-03-23 09:56:00'

I had to uses a specific ESX command instead :

esxcli system time set  -y 2016 -M 03 -d 23  -H 10 -m 05 -s 00
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  • 5
    Thanks for the -1, but would you mind explaining why ? If you got a better/more complete/more exact answer, feel free to comment.
    – Balmipour
    Commented Jul 6, 2017 at 13:34
-2

I used the date command and time format listed below to successfully set the date from the terminal shell command performed on Android Things which uses the Linux Kernal.

date 092615002017.00

MMDDHHMMYYYY.SS

MM - Month - 09

DD - Day - 26

HH - Hour - 15

MM - Min - 00

YYYY - Year - 2017

.SS - second - 00

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  • 1
    Since this does not work with either GNU or BSD date, could you please add more info about what system this is relevant for and how it's relevant to this particular question.
    – Kusalananda
    Commented Sep 26, 2017 at 21:07

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