This Cosa library is an implementation of the Network Time Protocol (NTP) client; access time from server on network. Used for clock synchronization between computer systems over packet-switched, variable-latency data networks. Note: this implementation does not adjust for clock drift or network latency.
To use this library you must download and install the [Arduino IDE] (http://www.arduino.cc/en/Main/Software) (or GCC AVR toolchain) and [Cosa] (https://github.com/mikaelpatel/Cosa).
Download and unzip the Cosa-NTP library into your sketchbook libraries directory. Rename from Cosa-NTP-master to NTP.
The NTP library and examples should be found in the Arduino IDE File>Sketchbook menu. Open the CosaNTP example sketch. Select the Cosa core by selecting one of the Cosa boards in the Tools>Board menu.