diff --git a/lib/ical/timezone.js b/lib/ical/timezone.js
index a59c2165..cd227364 100644
--- a/lib/ical/timezone.js
+++ b/lib/ical/timezone.js
@@ -450,32 +450,34 @@ class Timezone {
     } else {
       let props = aComponent.getAllProperties("rdate");
       for (let rdate of props) {
-        let time = rdate.getFirstValue();
-        change = init_changes();
-
-        change.year = time.year;
-        change.month = time.month;
-        change.day = time.day;
-
-        if (time.isDate) {
-          change.hour = dtstart.hour;
-          change.minute = dtstart.minute;
-          change.second = dtstart.second;
+        for (let value of rdate.getValues()) {
+          let time = value instanceof Time ? value : value.start;
+          change = init_changes();
 
-          if (dtstart.zone != Timezone.utcTimezone) {
-            Timezone.adjust_change(change, 0, 0, 0, -change.prevUtcOffset);
+          change.year = time.year;
+          change.month = time.month;
+          change.day = time.day;
+
+          if (time.isDate) {
+            change.hour = dtstart.hour;
+            change.minute = dtstart.minute;
+            change.second = dtstart.second;
+
+            if (dtstart.zone != Timezone.utcTimezone) {
+              Timezone.adjust_change(change, 0, 0, 0, -change.prevUtcOffset);
+            }
+          } else {
+            change.hour = time.hour;
+            change.minute = time.minute;
+            change.second = time.second;
+
+            if (time.zone != Timezone.utcTimezone) {
+              Timezone.adjust_change(change, 0, 0, 0, -change.prevUtcOffset);
+            }
           }
-        } else {
-          change.hour = time.hour;
-          change.minute = time.minute;
-          change.second = time.second;
 
-          if (time.zone != Timezone.utcTimezone) {
-            Timezone.adjust_change(change, 0, 0, 0, -change.prevUtcOffset);
-          }
+          changes.push(change);
         }
-
-        changes.push(change);
       }
 
       let rrule = aComponent.getFirstProperty("rrule");
diff --git a/test/timezone_test.js b/test/timezone_test.js
index 2d80dfa5..c9af3c5c 100644
--- a/test/timezone_test.js
+++ b/test/timezone_test.js
@@ -263,6 +263,55 @@ suite('timezone', function() {
     });
   });
 
+  suite('#_expandComponent', function() {
+    function timezoneWithRdates(daylightRdate, standardRdate) {
+      let component = new ICAL.Component(ICAL.parse(`BEGIN:VTIMEZONE
+TZID:Makebelieve/MultiRdate
+BEGIN:DAYLIGHT
+DTSTART:19800406T030000
+${daylightRdate}
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+END:DAYLIGHT
+BEGIN:STANDARD
+DTSTART:19800928T030000
+${standardRdate}
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+END:STANDARD
+END:VTIMEZONE`));
+
+      return new ICAL.Timezone(component);
+    }
+
+    function assertSummerUtcTime(zone) {
+      let time = ICAL.Time.fromDateTimeString('2026-07-01T12:00:00');
+      time.zone = zone;
+      assert.equal(
+        time.convertToZone(ICAL.Timezone.utcTimezone).toString(),
+        '2026-07-01T10:00:00Z'
+      );
+    }
+
+    test('uses every value in multi-valued RDATE properties', function() {
+      let zone = timezoneWithRdates(
+        'RDATE:20250330T030000,20260329T030000,20270328T030000',
+        'RDATE:20251026T030000,20261025T030000,20271031T030000'
+      );
+
+      assertSummerUtcTime(zone);
+    });
+
+    test('uses the start of every PERIOD-valued RDATE', function() {
+      let zone = timezoneWithRdates(
+        'RDATE;VALUE=PERIOD:20250330T030000/PT1H,20260329T030000/PT1H,20270328T030000/PT1H',
+        'RDATE;VALUE=PERIOD:20251026T030000/PT1H,20261025T030000/PT1H,20271031T030000/PT1H'
+      );
+
+      assertSummerUtcTime(zone);
+    });
+  });
+
   suite('#utcOffset', function() {
     test('empty vtimezone', function() {
       let subject = new ICAL.Timezone({