diff --git a/.patches/sabre-vobject-rdate.patch b/.patches/sabre-vobject-rdate.patch
new file mode 100644
index 000000000..e18bf1bd4
--- /dev/null
+++ b/.patches/sabre-vobject-rdate.patch
@@ -0,0 +1,43 @@
+From 099a37744a3aaf368bdd339f9c01e34553e8828e Mon Sep 17 00:00:00 2001
+From: SebastianKrupinski <krupinskis05@gmail.com>
+Date: Wed, 19 Nov 2025 19:19:32 -0500
+Subject: [PATCH] fix: use RDATE in time range check and use all instances
+
+Signed-off-by: SebastianKrupinski <krupinskis05@gmail.com>
+---
+ lib/Component/VEvent.php               |  2 +-
+ lib/Recur/EventIterator.php            |  6 ++++-
+ tests/VObject/Component/VEventTest.php | 35 ++++++++++++++++++++++++++
+ 3 files changed, 41 insertions(+), 2 deletions(-)
+
+diff --git a/lib/Component/VEvent.php b/lib/Component/VEvent.php
+index e29e56322..6ca196d66 100644
+--- a/lib/Component/VEvent.php
++++ b/lib/Component/VEvent.php
+@@ -41,7 +41,7 @@ class VEvent extends VObject\Component
+      */
+     public function isInTimeRange(\DateTimeInterface $start, \DateTimeInterface $end): bool
+     {
+-        if ($this->RRULE) {
++        if ($this->RRULE || $this->RDATE) {
+             try {
+                 $it = new EventIterator($this, null, $start->getTimezone());
+             } catch (NoInstancesException $e) {
+diff --git a/lib/Recur/EventIterator.php b/lib/Recur/EventIterator.php
+index 2c93bcf4e..79a070ee4 100644
+--- a/lib/Recur/EventIterator.php
++++ b/lib/Recur/EventIterator.php
+@@ -164,8 +164,12 @@ public function __construct($input, ?string $uid = null, ?\DateTimeZone $timeZon
+         }
+ 
+         if (isset($this->masterEvent->RDATE)) {
++            $rdateValues = [];
++            foreach ($this->masterEvent->RDATE as $rdate) {
++                $rdateValues = array_merge($rdateValues, $rdate->getParts());
++            }
+             $this->recurIterator = new RDateIterator(
+-                $this->masterEvent->RDATE->getParts(),
++                $rdateValues,
+                 $this->startDate
+             );
+         } elseif (isset($this->masterEvent->RRULE)) {
diff --git a/composer.patches.json b/composer.patches.json
index ae985da3f..73fb07c30 100644
--- a/composer.patches.json
+++ b/composer.patches.json
@@ -6,6 +6,9 @@
 		},
 		"sabre/dav": {
 			"Check for instanceof INode instead of Node": ".patches/check-for-instanceof-INode-instead-of-Node-1595.patch"
+		},
+		"sabre/vobject": {
+			"fix use RDATE in time range check and use all instances": ".patches/sabre-vobject-rdate.patch"
 		}
 	}
 }
diff --git a/sabre/vobject/PATCHES.txt b/sabre/vobject/PATCHES.txt
new file mode 100644
index 000000000..9cc99e5bd
--- /dev/null
+++ b/sabre/vobject/PATCHES.txt
@@ -0,0 +1,7 @@
+This file was automatically generated by Composer Patches (https://github.com/cweagans/composer-patches)
+Patches applied to this directory:
+
+fix use RDATE in time range check and use all instances
+Source: .patches/sabre-vobject-rdate.patch
+
+
diff --git a/sabre/vobject/lib/Component/VEvent.php b/sabre/vobject/lib/Component/VEvent.php
index 6ea93ed5e..a385a09e1 100644
--- a/sabre/vobject/lib/Component/VEvent.php
+++ b/sabre/vobject/lib/Component/VEvent.php
@@ -29,7 +29,7 @@ class VEvent extends VObject\Component
      */
     public function isInTimeRange(DateTimeInterface $start, DateTimeInterface $end)
     {
-        if ($this->RRULE) {
+        if ($this->RRULE || $this->RDATE) {
             try {
                 $it = new EventIterator($this, null, $start->getTimezone());
             } catch (NoInstancesException $e) {
diff --git a/sabre/vobject/lib/Recur/EventIterator.php b/sabre/vobject/lib/Recur/EventIterator.php
index 55d6e4779..212c147d5 100644
--- a/sabre/vobject/lib/Recur/EventIterator.php
+++ b/sabre/vobject/lib/Recur/EventIterator.php
@@ -168,8 +168,12 @@ public function __construct($input, $uid = null, ?DateTimeZone $timeZone = null)
         }
 
         if (isset($this->masterEvent->RDATE)) {
+            $rdateValues = [];
+            foreach ($this->masterEvent->RDATE as $rdate) {
+                $rdateValues = array_merge($rdateValues, $rdate->getParts());
+            }
             $this->recurIterator = new RDateIterator(
-                $this->masterEvent->RDATE->getParts(),
+                $rdateValues,
                 $this->startDate
             );
         } elseif (isset($this->masterEvent->RRULE)) {