Developers, makers and hobbyists looking for a real time clock module complete with an Arduino library, may be interested in the Kraztech Real Time Clock Module created by developer Christopher ...

He’s made a real-time-clock module controlled ... bring the rubidium standard, an RTC module, and GPS module together with an ATMega32U4 miniature Arduino-compatible board and an LCD display.

Dejan Nedelkovski has built a stylish DIY touchscreen Arduino music player ... it uses the BY8001 MP3 Player module and for the alarm clock it uses the DS3231 Real Time Clock module.