UNSET_DAYS
int days = UNSET_DAYS;
if (days <= UNSET_DAYS) {
if (days != UNSET_DAYS)
if (days == UNSET_DAYS)
int days = UNSET_DAYS; /* not explicitly set */
if (days <= UNSET_DAYS) {
if (preserve_dates && days != UNSET_DAYS) {
if (days == UNSET_DAYS)