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What is the command to update time and date from Internet? Is there any application that allows me to do so from its user interface rather than from the shell?

  • Can you identify which Ubuntu version you are using? – david6 Nov 21 '11 at 22:04
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    Do you need extremely accurate time? (If so, you need to familiarize yourself with ntpq and choose time servers). If you just want your time to be (approx.) correct, then try: System Settings >> Time & Date, and check that 'Set the time' is set to 'Automatically from the Internet'. – david6 Nov 21 '11 at 23:26
  • If you want constantly extremely accurate, install ntpd. This is a small process that runs in the background and adjusts time constantly instead of bursts/jumps, but it will take up a bit of your resources. – strugee May 24 '13 at 4:08
  • Worth noting that this changed as of 2018, and the top answers are no longer correct for recent versions of Ubuntu. You will likely need this answer: askubuntu.com/a/998449/53783 – Niels Abildgaard May 15 '18 at 11:38

10 Answers 10

135

You can do so with e.g. sudo ntpdate time.nist.gov. Other servers include time.windows.com, etc.

http://www.pool.ntp.org/ lists time servers around the world.

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    I'm getting an error the NTP socket is in use, exiting – friederbluemle Aug 11 '14 at 2:29
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    @friederbluemle As said in this answer, you have to stop ntp service sudo service ntp stop. Then you can use the command suggested in the answer and finally you can restart the service with sudo service ntp start – Michele Sep 7 '14 at 14:35
  • This works, but it doesn't update the clock in the taskbar automatically. – posfan12 Jul 12 '16 at 23:36
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    I get a "ntpdate[15806]: no server suitable for synchronization found" error. The second answer below using the google.com works better – Kim Stacks May 4 '17 at 12:10
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    ntpdate: command not found – rogerdpack May 17 '18 at 21:08
109

This is a nice little code I found to update your time in case you have issues with ntp:

sudo date -s "$(wget -qSO- --max-redirect=0 google.com 2>&1 | grep Date: | cut -d' ' -f5-8)Z"
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    This worked for me, thanks! :) – Nullldata Jul 7 '16 at 2:31
  • Nice solution ! – Farid Rn Aug 24 '16 at 10:55
  • Very Nice, worked for me. – Janderson Silva Jan 6 '17 at 19:40
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    This should be the accepted answer! – brijs Jan 31 '17 at 18:23
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    This is good, but it usually will be between 8 and 50 ms behind since it doesn't synchronize per se. – Nonny Moose Jul 14 '18 at 14:54
30

As of 2018 with a fresh installed Ubuntu 16.04 LTS, running sudo ntpdate time.nist.gov gives:

sudo: ntpdate: command not found

This is because (official source):

ntpdate is considered deprecated in favour of timedatectl and thereby no more installed by default.

Instead do this to force the sync to happen now:

sudo timedatectl set-ntp off
sudo timedatectl set-ntp on

In my case I was running a Ubuntu on a virtualbox and had saved the machine state so when I started the instance back up again it did not automatically sync the clock since there was no boot event to trigger the sync. So the time was still showing what it was the last time I was running the virtual box.

  • I just upgraded to bionic and noticed that ntpdate wasn't working anymore, and timedatectl worked for me. – kapad Jul 6 '18 at 8:39
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    It worked for me too, on Ubuntu 18.04. – kiamlaluno Jul 14 '18 at 11:43
  • If the time doesn't change, check your timezone with just timedatectl. If it's wrong, see the --help section for the command on how to change it. – Brad Turek Aug 22 '18 at 16:28
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    Nice catch for the Virtual Box. Saved a lot of debugging headache! – Mohd Abdul Mujib Nov 11 '18 at 23:57
12

It's very easy to set up from command line: https://help.ubuntu.com/lts/serverguide/NTP.html From that link:

Ubuntu comes with ntpdate as standard, and will run it once at boot time to set up your time according to Ubuntu's NTP server: ntpdate -s ntp.ubuntu.com

Here's GUI example https://help.ubuntu.com/community/UbuntuTime#Time_Synchronization_using_NTP

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    Please do not use links to other sites. When they disappear so does the information you posted. Prevent 'link rot' from happening by answering with the content of the link (and give credit where credit is due). – Rinzwind Nov 21 '11 at 13:46
12

Running this command in a terminal should do the trick

sudo dpkg-reconfigure tzdata

You can add extra time zones graphically, I think, by clicking on the clock and going through its options.

  • Timezones are not really the same as (accurate) time. But, it also not very clear what Vikramjeet was asking either. – david6 Nov 21 '11 at 22:05
  • What is the command to update time and date from Internet is the question, sudo dpkg-reconfigure tzdata is the answer, so what gives? the comment about the timezones, is related to the only thing i know to be possible graphically – Jayo Nov 21 '11 at 22:24
  • I assumed that by graphically they meant a graphical (or 'GUI') method, and NOT geographic (or worldwide). – david6 Nov 21 '11 at 22:55
  • so did i, i am not aware of a way to update the date and time via the net graphically, so i use the terminal, what i do know how to do graphically is set up time zones, the part about time zones was my two cents on what can be done to affect the time in a graphical manner, as far as i knew, am i understood now? – Jayo Nov 21 '11 at 23:19
1

You need to install the ntp package. Date/Time settings are availble under system settings. Here's some more information.

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    The link is dead... As said by Rinzwind "Please do not use links to other sites. When they disappear so does the information you posted. Prevent 'link rot' from happening by answering with the content of the link (and give credit where credit is due)." Thanks – Michele Sep 7 '14 at 14:30
1

Most here won't work, since ntp will override your settings within seconds.

You need to disable NTP first. On ubuntu it is done as:

    # Disable ntp
    sudo timedatectl set-ntp 0

Then you can do:

    # Set software clock 
    sudo date --set="2018-04-01 22:22:22"
    # Sync with hardware clock 
    sudo hwclock --systohc
1
dateFromServer=$(curl -v --silent https://google.com/ 2>&1 \
   | grep Date | sed -e 's/< Date: //'); date +"%d%m%Y%H%M%S" -d "$dateFromServer"

or

date -s `curl -I 'https://startpage.com/' 2>/dev/null | grep -i '^date:' | sed 's/^[Dd]ate: //g'`
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    The standard way of setting the date and time by connecting with time servers via ntp. Why are you using https connections to do this? – xiota May 14 '18 at 1:23
  • // , Sometimes it's nice to have an alternative to the standard way, I guess. – Nathan Basanese Jan 16 at 3:25
1

Is there any application that allows me to do so from its user interface rather than from the shell?

I'm using 17.10 and can go to Settings (from the upper-right menu in the UI) > Details > Date & Time. In my case, my system wasn't updating from the Internet even though "Automatic Date & Time" was set to "ON". I simply changed it to "OFF", waited a second, then changed it back to "ON". It picked up the current date and time and I was good to go.

0

Thanks to Twiglets [For AsusWRT/Merlin Routers]

Here is an alternative that DOES set the date !!! [-s option]. Prints out 'Date' it retrieves & the 'Date' that is set for comparison.

On AsusWRT / Merlin, the only thing that is odd is that the date retrieved is ".... GMT" and the date utility sets the correct time but changes it to "... DST" Environment has TZ set to "GMT"

datetext=$(curl -I 'https://1.1.1.1/' 2>/dev/null | grep "Date:" |sed 's/Date: [A-Z][a-z][a-z], //g'| sed 's/\r//') ; echo "Date Retrieved = $datetext" ; echo -n "Date set = " ; date -s "$datetext" -D'%d %b %Y %T %Z'

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