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-rw-r--r--src/recur.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/recur.c b/src/recur.c
index 4e8bd09..46f669d 100644
--- a/src/recur.c
+++ b/src/recur.c
@@ -815,6 +815,18 @@ recur_item_find_occurrence(time_t item_start, long item_dur,
lt_item_day.tm_isdst = lt_day.tm_isdst;
t = mktime(&lt_item_day);
+ /*
+ * Impossible dates must be ignored (according to RFC 5545). Changing
+ * only the year or the month may lead to dates like 29 February in
+ * non-leap years or 31 November.
+ */
+ if (rpt_type == RECUR_MONTHLY || rpt_type == RECUR_YEARLY) {
+ localtime_r(&t, &lt_item_day);
+ if (lt_item_day.tm_mday != lt_item.tm_mday)
+ return 0;
+ }
+
+ /* Exception day? */
if (LLIST_FIND_FIRST(item_exc, &t, exc_inday))
return 0;