Maybe you need a RTC Chip like this:
https://www.sparkfun.com/products/10160
@Sacha started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Maybe you need a RTC Chip like this:
https://www.sparkfun.com/products/10160