When a Wall Display or CPU has been powered off, or disconnected from the internet for a length of time, the internal clock may gain, or lose time. And when reconnected to the internet, the DAKboard device will automatically update the time. However, sometimes this updated process is delayed and an "incorrect date/time" or "Your clock is behind" message will appear. 


First, if your device is connected to the internet, leave it powered on for about 5-10 minutes to give it enough time to sync, then restart it by unplugging the power and plugging it back in. 


If this doesn't seem to work, a USB keyboard can be plugged into the unit and the time corrected with the following steps:

  1. Press the Option key (could be a windows logo, or Alt key depending on keyboard). This should bring up a menu in the upper left of the screen.
  2. Use the arrow keys to go down to "Accessories", then arrow right, and down to "Terminal" and press the Enter key. This should bring up a black terminal window.
  3. Type the command: sudo apt-get install rdate then press enter
  4. When finished, type: sudo nano /etc/rc.local. This will open a file.
  5. Near the bottom of the file, above the line “exit 0” added the following: sudo rdate -s time.nist.gov
  6. Press ctrl o then enter then ctrl x then enter to save and quit the file. 
  7. Last, type sudo reboot to restart the unit and apply the changes


If the above doesn't seem to work, the following steps can also be followed: 


  1. Press the Option key (could be a windows logo, or Alt key depending on keyboard). This should bring up a menu in the upper left of the screen.
  2. Use the arrow keys to go down to "Accessories", then arrow right, and down to "Terminal" and press the Enter key. This should bring up a black terminal window.
  3. Enter the following commands:


sudo apt-get update && sudo apt-get -y install ntp

sudo systemctl stop systemd-timesyncd

sudo systemctl disable timesyncd

sudo /etc/init.d/ntp stop

sudo /etc/init.d/ntp start


After the above command are completed, the time should start to synchronize automatically.  You can reboot the device to ensure that the date/time remain synchronized.


Lastly, ensure there is nothing on the network that would be blocking traffic to the following time servers:


0.ubuntu.pool.ntp.org

1.ubuntu.pool.ntp.org

2.ubuntu.pool.ntp.org

3.ubuntu.pool.ntp.org