The 8 Best Raspberry Pi Clock Projects You Can Make:
Simple Pico Clock: https://www.instructables.com/Simple-Pico-Clock/
"This instructable shows how to make a Raspberry Pi Pico-powered 128x32 OLED digital clock ..."
ClockUI - Raspberry Pi Smart Clock built with PySide6:
The circular display for this is about $100!
Raspberry Pi Pico smart clock with lots of cool features:
"Key features include:
- Dual LCD Displays: Time and temperature on the top LCD, menu and status on the bottom LCD.
- DS3231 RTC: Accurate timekeeping with battery backup.
- DHT11 Sensor: Temperature monitoring in Fahrenheit.
- 4x4 Keypad: Intuitive menu navigation and settings input.
- Wi-Fi & NTP Sync: Internet connectivity for automatic time updates.
- Buzzer: Audible alerts for timers and alarms.
- Modes: Timer, stopwatch, alarm, stats display, and timezone adjustment."
Building a Smart Clock with Raspberry Pi - an always-on digital clock with real-time weather information: