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diff --git a/src/parser/calendar/data/PhutilCalendarRecurrenceRule.php b/src/parser/calendar/data/PhutilCalendarRecurrenceRule.php
--- a/src/parser/calendar/data/PhutilCalendarRecurrenceRule.php
+++ b/src/parser/calendar/data/PhutilCalendarRecurrenceRule.php
@@ -561,10 +561,15 @@
$by_month = $this->getByMonth();
$by_setpos = $this->getBySetPosition();
+ // If we have a BYMONTHDAY, we consider that set of days in every month.
+ // For example, "FREQ=YEARLY;BYMONTHDAY=3" means "the third day of every
+ // month", so we need to expand the month set if the constraint is present.
+ $by_monthday = $this->getByMonthDay();
+
while (!$this->setMonths) {
$this->nextYear();
- if ($is_monthly || $by_month) {
+ if ($is_monthly || $by_month || $by_monthday) {
$months = $this->newMonthsSet(
($is_monthly ? $interval : 1),
$by_month);
diff --git a/src/parser/calendar/data/__tests__/PhutilCalendarRecurrenceRuleTestCase.php b/src/parser/calendar/data/__tests__/PhutilCalendarRecurrenceRuleTestCase.php
--- a/src/parser/calendar/data/__tests__/PhutilCalendarRecurrenceRuleTestCase.php
+++ b/src/parser/calendar/data/__tests__/PhutilCalendarRecurrenceRuleTestCase.php
@@ -131,6 +131,24 @@
'20080229',
);
+ $tests[] = array(
+ 'BYMONTH' => array(1, 3),
+ );
+ $expect[] = array(
+ '19980102',
+ '19980302',
+ '19990102',
+ );
+
+ $tests[] = array(
+ 'BYMONTHDAY' => array(1, 3),
+ );
+ $expect[] = array(
+ '19970903',
+ '19971001',
+ '19971003',
+ );
+
$this->assertRules(
array(
'FREQ' => 'YEARLY',
@@ -157,6 +175,16 @@
$rrule->setInterval($interval);
}
+ $by_month = idx($options, 'BYMONTH');
+ if ($by_month) {
+ $rrule->setByMonth($by_month);
+ }
+
+ $by_monthday = idx($options, 'BYMONTHDAY');
+ if ($by_monthday) {
+ $rrule->setByMonthDay($by_monthday);
+ }
+
$set = id(new PhutilCalendarRecurrenceSet())
->addSource($rrule);

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