magicCodeDay

int thisIsMagic(int year, int month, int day) {
        if (month < 3) {
            year--;
            month += 12;
        }
        return 365*year + year/4 - year/100 + year/400 + (153*month - 457)/5 + day - 306;
    }

//USED: int numberOfDays = thisIsMagic(2016, 4, 6) - thisIsMagic(2010, 3, 4);