Like many early microcomputers, the Commodore VIC-20 did not come with an interna real-time clock built into the system.

What more could you possibly want from an RTC Module?” Specifications for the Kraztech Real Time Clock Module include : – I2C Interface – Hours, Minutes, Seconds, Day of Week, Day, Month, Year ...

He’s made a real-time-clock module controlled by a rubidium frequency standard, and since it also includes a GPS clock he can track local time dilation effects by comparing the two.