Use for the RTC inside the SAM3X8E from the Arduino DUE
The RTCDue Library feature: access to the RTC Modul from the DUE to set time, date and alarm functions.
Maintainer: Markus Lange
This library is compatible with the sam architecture so you should be able to use it on the following Arduino boards:
To use this library, open the Library Manager in the Arduino IDE and install it from there.