RE: Setting time manually without internet
Well, changing the time zone is about the only thing you can correct. You cannot manually enter any time, nor can you set up your own NTP 🙁
RE: Setting time manually without internet
What's so bad/dangerous about connecting the printer to the internet for about 5 to 10 seconds max. every 3 months? There are no external ports opened in your firewall to allow access to attackers from outside for this. I don't see any downside from this and entering the correct time via the screen or the rotary encoder, if it was made possible at all, would definitely take longer.
Just because you are paranoid does not mean they are not after you, right? 🙂
RE: Setting time manually without internet
"What's so bad/dangerous about connecting the printer to the internet for about 5 to 10 seconds max. every 3 months?" That it is impossible. No connections allowed except for explicitly ordered ones. For internal usage there is an NTP server we can use, but there is no GUI how I could instruct the printer to use that.
Also, you cannot set the time manually. If there is a GUI for that then I did not find it, and several others as well...
RE: Setting time manually without internet
Then just use a mobile hotspot on your mobile and connect the printer's wifi to it. Just wait until nobody of your admins is around ... 😉
Hard to prove afterwards that you did it!