FreeBSD Set Date Time and Timezone

by on February 10, 2006 · 20 comments· LAST UPDATED March 5, 2009

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How do I setup date and time under FreeBSD operating system using a shell prompt?

Under FreeBSD you can use date command to display or set date and time. The date command displays the date and time read from the kernel clock. If you just type date command without any options (read as without arguments) the date command display the current date and time only.

Please note that if you are looking Linux specific date command faq, please read this FAQ.

FreeBSD Display todays date

Type date command as follows, to display todays date and time:
$ date
Output:

Thu Feb  9 23:43:19 IST 2006

FreeBSD set date and time

Only the superuser or root user may set the date under FreeBSD. General format of date command is as follows:
date yymmddhhmmss
Where,

  • yy : Year in two digit
  • mm : Month (1-12)
  • dd : Day (1-31)
  • hh : Hours (0..23)
  • mm : Minutes (0..59)
  • ss : Seconds (0..61)

For example following command set date to 12-Jan-2004, 4:27 PM (remember you must be a root user to set date and time)
# date 0401121627
Output:

Mon Jan 12 16:27:00 IST 2004

FreeBSD Set Time Without Modifying The Date

Type the following command to sets the time to 4:30 PM:
# date 1630

FreeBSD Setup Timezone

To setup corrct timezone you need to copy your timezone file from /usr/share/zoneinfo directory to /etc/localtime file. Just goto directory:
# cd /usr/share/zoneinfo

Use ls -l command to find out your zonefile.
# ls -l

For example I am in Asia/Culcatta (IST time zone) so I need to copy file as follows:
# cp /usr/share/zoneinfo/Asia/Calcutta /etc/localtime

date command and use of environment variable

You can also use TZ environment variable to display date and time according to your timezone. For example to display the current time in California you need to export TZ as follows (assuming that you are using bash shell):
# date

Output:

Fri Feb 10 00:39:59 IST 2006

Now use TZ variable:
# export TZ=America/Los_Angeles
# date

Output:

Thu Feb 9 11:10:08 PST 2006

See also:

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{ 20 comments… read them below or add one }

1 JaY October 2, 2006 at 6:39 am

Good Site.. Keep Up the Good Work. Just wanted to point out that you may confuse a noob by showing this example since you put mm at the end of your sample but in your key you list ss as the second. Probly should tell them its the minute.. Just a FYI I know how it is.. nix people jot things down so fast that they don’t even notice it..

date yymmddhhmm
Where,

yy : Year in two digit
mm : Month (1-12)
dd : Day (1-31)
hh : Hours (0..23)
ss : Seconds

For the new person that didn’t know at the end of the string its the minute .. even though it looks like it asks for the month in this example.

JaY

Reply

2 nixCraft October 2, 2006 at 6:59 am

JaY,

It was typo. The correct syntax is as follows (updated):
date yymmddhhss

Appreciate your post.

Reply

3 Gooofy October 12, 2006 at 5:39 pm

That conflicts with the format posted here
http://www.linuxdevcenter.com/linux/cmd/cmd.csp?path=d/date

date mmddhhmmyy

Reply

4 nixCraft October 12, 2006 at 8:15 pm

Gooofy,

This FAQ is about FreeBSD and not about Linux. So the command format is correct and it only works with FreeBSD. Linux specific information:
http://www.cyberciti.biz/faq/howto-set-date-time-from-linux-command-prompt/

Reply

5 Paul October 31, 2006 at 7:11 am

Your site was really of much help to me. Thanks a million.

Reply

6 Charles February 14, 2007 at 8:00 pm

I did major screwup on production server wanting to paste a date change command to a test machine.

just be careful when you test daylight savings, and make sure you do it on a “test” machine not on your NTP server :)

Reply

7 Otuyelu June 11, 2007 at 7:55 am

While on a FreeBSD system tried using the Linux format to no avail, before running to google where i found your post.

Thanks for posting, a real help

Reply

8 Chater August 24, 2008 at 9:24 am

Very big thanks.
It’s very useful. I was seek this info on many of russian sites, but only your blog is help me :)
So thanxxx again

Reply

9 Richard December 4, 2008 at 4:53 am

You should correct the format it isn’t

“date yymmddhhSS”

it is

“date yymmddhhMM”

The last two digits will be the minutes, not the seconds.

Reply

10 matt June 12, 2009 at 12:31 pm

date yymmddhh.ss

The key is the period before “.ss”

Reply

11 shake.chen December 13, 2009 at 8:20 am

in linux , I can use

date -R

I can check the time zone, how to do in freebsd?

Reply

12 nixCraft December 13, 2009 at 8:45 am

Try
ls -l /etc/localtime
OR note down filesize
ls -l /etc/localtime
cd /usr/share/timezone
find . | grep filesize

Reply

13 shaffy August 2, 2010 at 9:55 am

its really useful.

Reply

14 Tony Acost January 28, 2011 at 5:19 pm

This is excellent, i was wondering how to get my clock with the right time. Thanks to this I was able to copy my zoneinfo file into /etc/localtime. Thank you

Reply

15 X. Benedict March 15, 2011 at 10:14 am

I prefer

ln -s /usr/share/zoneinfo/Australia/Sydney /etc/localtime (for FreeBSD)

rather than copying the file. That way when all the timezone data gets updated, you don’t have to copy it again.

Reply

16 Pétur Ingi Egilsson April 30, 2011 at 12:21 pm

Thanks, very useful.

Reply

17 Finn Espen Gundersen June 4, 2012 at 1:25 pm

Note that Matt’s format is correct, you need to change the blog post to show a dot before ss or FreeBSD (tested on 9.0) will give error “nonexistent time”.

Reply

18 Dave July 30, 2012 at 4:03 am

Note that cron will continue to use the old system time zone until you restart it:

# service cron restart

Reply

19 Leander February 16, 2014 at 11:14 pm
get_current_timzone() {
 CURRENT_TIMEZONE="$(md5 /etc/localtime | awk '{print $4}')"
 find /usr/share/zoneinfo | while read LINE; do FOUND_TIMEZONE="$(md5 ${LINE} | awk '{print $4}')" if [ "${CURRENT_TIMEZONE}" == "${FOUND_TIMEZONE}" ]; then echo ${LINE} | sed -E 's|/usr/share/zoneinfo/||' fi done
}
root@Host-10 [~]$ get_current_timzone

Reply

20 l2f March 29, 2014 at 4:50 pm

Dear,

After copying your timezone file to /etc/localtime do not forgot to run “adjkerntz -a” (man adjkerntz)

Regards,

l2f

Reply

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