Linux date time

sudo dpkg-reconfigure tzdata

timedatectl set-ntp true

If ntpd is not installed use one of the following command to install ntpd

sudo apt-get install ntp

You should at least set following parameter in /etc/ntp.conf config file

server <Time Server Name or IP Address>

For example, open /etc/ntp.conf file using vi text editor

vi /etc/ntp.conf

Locate server parameter and set it as follows

server pool.ntp.org

Save the file and restart the ntpd service

/etc/init.d/ntpd start

You can synchronize the system clock to an NTP server immediately with following command

ntpdate pool.ntp.org

For setting the time and date manually use the following syntax

date --set="STRING"

For example, to set the date to 2 Oct 2006 18:00:00, type the following command as root user

date -s "2 OCT 2006 18:00:00"

OR

date --set="2 OCT 2006 18:00:00"

You can also simplify format using following syntax

date +%Y%m%d -s "20081128"

To set time use the following syntax

date +%T -s "10:13:13"

where:

You can use %p for the locale's equivalent of AM/PM

date +%T%p -s "6:10:30AM"
date +%T%p -s "12:10:30PM"