SOFTWARE REAL TIME CLOCK

As my dad asked me to make him an LCD CLOCK for his camper van ( and later add more sensors like temperature, GPS, etc), i decided to develop a SOFTWARE REAL TIME CLOCK...At least for now, untill i get a RTC chip ( that will keep the time).
Quite a simple project, anyway, using the GNU library swRTC.h !
Supported chips are :Atmega640/1280/1281/2560/2561 and Arduino MEGA boards
Atmega48/88/168/328 and Arduino 2009/UNO boards
Attiny24/44/84
Attiny25/45/85
Attiny2313
Atmega644/1284 and Sanguino boards
Supported clocks are 1/8/16 MHz.
 Ill be posting the code and schematics soon