Raspberry Pi Pico NTP Clock uses Network Time Protocol to stay in time
This uses a Raspberry Pi Pico W, the superb MMBASIC for the Pico, and a Waveshare Pico-Eval-Board. Download source code from GitHub, follow the instructions in the MMBASIC manual to set up network access for the Pico/W, and you'll get a clock that checks in with NTP once an hour and displays date and time.