Quantity   Component name
1 × DS3231 module Clock and Timer ICs / Real-Time Clocks <a target="_blank" rel="noopener noreferrer" href="https://www.aliexpress.com/item/Precision-DS3231-RTC-Module-Memory-Module-Raspberry-Pi/32661561264.html">https://www.aliexpress.com/item/Precision-DS3231-RTC-Module-Memory-Module-Raspberry-Pi/32661561264.html</a>
1 × Arduino MEGA
1 × 7-segment clock display - 1.2" digit height <a target="_blank" rel="noopener noreferrer" href="https://www.adafruit.com/product/1265">https://www.adafruit.com/product/1265</a>