Communication
realtime clock library for DS3231, RV3032, and PCF8563.
A full featured RTC library which auto-detects one of 3 popular I2C devices and supports alarm, clock out and time setting/retrieval.
Maintainer: Larry Bank
This library is compatible with all architectures so you should be able to use it on all the Arduino boards.
To use this library, open the Library Manager in the Arduino IDE and install it from there.