Summary

https://www.youtube.com/watch?v=jHT4-2Z0mIQ

read the full guide on: https://learn.adafruit.com/micropython-oled-watch/overview
It's MicroPython Time! In this project we’ll show you how to make a watch using an Adafruit Feather M0, an RTC module and an OLED display.
This uses microPython, which is an interpreted language that runs on small embedded boards.

Be sure to check out Tony’s MicroPython playlist to learn how you can write clean and simple Python code to control hardware.

Feather M4 Express
https://www.adafruit.com/product/3857

RTC FeatherWing
https://www.adafruit.com/products/3028

OLED FeatherWing
https://www.adafruit.com/products/2900

Tripler FeatherWing
https://www.adafruit.com/product/3417

CR1220 Coin Cell
https://www.adafruit.com/products/380

400mAh 3.7v Battery
https://www.adafruit.com/product/3898

Short Male Headers for Feathers
https://www.adafruit.com/products/2940

Female Header set for Feathers
https://www.adafruit.com/products/2886