The System rebooted after the power supply went off and now it has the wrong date and I cannot use the add ons . can someone walk me the through the solution as I am a dummy
You need internet connection in order to have valid clock settings. If your clock is not set some time after a reboot, you might have
ntpd disabled. In that case, you can simply fix the clock manually by running
This will request current time from the server of your choice and set your local clock accordingly.
As a last resort, you can always set the date&time manually using
I would suggest you to have some script to check the time at the of reboot which is a part of cron, that would checks the ntp status and start it if needed. Also if you need to set right away the time set the time as well.
There is some good article as well on setting up your ntpd stuff here
This is a normal issue with RPi, as the clock is not supplied with a backup battery. There's a solutions for that using an addon 'Real Time Clock' board. Read here: https://thepihut.com/blogs/raspberry-pi-tutorials/17209332-adding-a-real-time-clock-to-your-raspberry-pi