leap_year
leap_year = dt->dt_year;
leap_year = dt_reasonable.dt_year;
leap_year = dt_reasonable.dt_year;
leap_year = 0;
if (leap_year > 0) {
if ((leap_year & 3) == 0) {
if ((leap_year % 100) == 0) {
if ((leap_year % 400) == 0)
int leap_year, had_leap_day;
dm = days_in_month[leap_year(year)][month];
leap = leap_year(year);