char* months[13] = {"tom", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

int calculate_key(char* str)
{
    int year;
	char month[3];
	int day, monthnum=0, compare = -1;

	printf("string is: %s\n", str);

    /*Läs in år, månad, dag*/
	fflush(stdin);
    printf("scanf return: %d\n", sscanf(str,"%d %s %d", &year, month, &day));
	printf("year = %d\n", year);

	printf("day = %d\n", day);

    for(int i=1; i<13; i++)
    {
        compare = strcmp(month, months[i]);
        /*Om strängarna är lika så returnerar strcmp 0*/
        if(compare==0)
        {
			printf("check\n");
            monthnum=i;
        }
    }
	printf("month = %s\n", month);

    return (year*10000)+(monthnum*100)+day;