Today Arduino has announced the availability of the new Arduino IDE in the form of version 1.6.8, which is now available with updated cores for almost all supported platforms including : AVR 1.6.10, ...
The most popular RTC for the Arduino is the DS1307. However, it does have some drawbacks, the most notable of which is that its operating voltage is 5v, which means it cannot be used with 3.3v ...