PHPoC Shield and PHPoC WiFi Shield are Internet Shields for Arduino Uno and Mega.
PHPoC [WiFi] Shield has a built-in rechargeable battery and RTC that allow to keep date and time information even when power is down.
This tutorial shows how to use Arduino Uno/Mega to get date and time information from RTC on PHPoC [WiFi] Shield. Date and time are printed to serial monitor.

Hardware Required...