У вашего броузера проблема в совместимости с HTML5
The arduino RTC / EEPROM shield has a DS1307 rtc chip as well as 2 32kb eeprom chips. It runs on the I2C bus so only uses 2 pins (analog 4 and 5). You can find more info here: http://www.diy-labs.com/rtc/arduino-rtc-eeprom-shield