Using 72xx LedControl with an existing sketch.

brevik:
My main problem here, I believe, is to somehow split these days, hours, minutes, seconds, variable into separate numbers equal to something like: days_hundred(hundreds number in days), days_dec(tens number in days), days_ones(ones number in days), hours_dec(tens number in hours), etc...

days_hundreds = days/100;
days_tens = (days %100)/10;
days_units = (days %100)%10;