int what_day(short year, char month, char day)
{
int a = (14 - month) / 12;
int y = year - a;
int m = month + 12 * a - 2;
return (7000 + (day + y + y / 4 - y / 100 + y / 400 + (31 * m) / 12)) % 7;
}

int what_week(short year, char month, char day)
{
unsigned short start_year = 1999;
unsigned char start_month = 8;
unsigned char start_day = 22;
const unsigned char daysinmonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
// count days in 1999 after aug 22
unsigned long day_counter = daysinmonth[start_month-1] - start_day;
for (;start_month <= 11; start_month++)
{
day_counter += daysinmonth[start_month-1];
}

for (;start_year < year-1; start_year++)
{
if (start_year%4)
day_counter += 365;
else
day_counter += 366;
}

for (start_month = 1; start_month < month; start_month++)
{
if ( start_month == 2 && !(year%4))
day_counter += 29;
else
day_counter += daysinmonth[start_month-1];
}

day_counter += day;

return day_counter/7 + 1024;
}