FreeBSD Set Date Time and Timezone

Posted on in Categories last updated March 5, 2009

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:

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

20 comment

  1. 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

  2. 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 :)

  3. 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.

  4. 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”.

  5. 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
    }
    
    [email protected] [~]$ get_current_timzone
    

Leave a Comment