find_rd
if ((dp = find_rd(rd, 0)) != NULL) {
struct cal_day *find_rd(int rd, int offset);
if ((dp = find_rd(rd, offset)) != NULL) {
if ((dp = find_rd(rd, offset)) != NULL) {
if ((dp = find_rd(floor(t), offset)) != NULL) {
if ((dp = find_rd(rd, 0)) != NULL) {
if ((dp = find_rd(rd, 0)) != NULL) {
if ((dp = find_rd(rd, 0)) != NULL) {