For a friend of mine, I built this machine in 2016. the brief was simple, because of my friend was some times a bit late he ask me to build for one of his client a time converter machine in the Back To The Future style. This machine will have to generate a random date from a date you gave to it. Obviously this date have to be post than the input date. Some time, the machine it-self is a bit late. This machine give you date and hour of the day, because this way it was not completely useless.
Here you can find arduino development I made for this project : https://framagit.org/dsimonet/mattrunks-convecteur-temporel
With a little backward I think it look like the Apollo Guidance Computer (AGC) https://en.wikipedia.org/wiki/Apollo_Guidance_Computer