The Micro Crystal RV-3029-C2 is a low power, real-time clock/calendar module with built-in Thermometer and Digital Temperature Compensation circuitry (DTCXO). This library is based in part on ...
Take a search for "RTC library" in your Arduino IDE or on GitHub and you'll find a plethora of existing libraries. Yes, many of them are great, but many of them are not. Many of them are old, outdated ...