diff --git a/application/Espo/Classes/FieldProcessing/Email/IcsDataLoader.php b/application/Espo/Classes/FieldProcessing/Email/IcsDataLoader.php
index dfe2420281..29088e0f08 100644
--- a/application/Espo/Classes/FieldProcessing/Email/IcsDataLoader.php
+++ b/application/Espo/Classes/FieldProcessing/Email/IcsDataLoader.php
@@ -39,6 +39,7 @@ use Espo\Core\{
     FieldProcessing\Loader,
     FieldProcessing\LoaderParams,
     Mail\Event\Event as EspoEvent,
+    Mail\Event\EventFactory,
     Utils\Log,
 };
 
@@ -84,18 +85,13 @@ class IcsDataLoader implements Loader
             return;
         }
 
-        $valueMap = (object) [];
+        if ($event->status === 'CANCELLED') {
+            return;
+        }
 
-        $espoEvent = EspoEvent::create()
-            ->withUid($event->uid ?? null)
-            ->withDateStart($event->dtstart_tz ?? null)
-            ->withDateEnd($event->dtend_tz ?? null)
-            ->withName($event->summary ?? null)
-            ->withLocation($event->location ?? null)
-            ->withDescription($event->description ?? null)
-            ->withTimezone($ical->calendarTimeZone() ?? null)
-            ->withOrganizer($event->organizer ?? null)
-            ->withAttendees($event->attendee ?? null);
+        $espoEvent = EventFactory::createFromU01jmg3Ical($ical);
+
+        $valueMap = (object) [];
 
         try {
             $valueMap->name = $espoEvent->getName();
@@ -103,6 +99,12 @@ class IcsDataLoader implements Loader
             $valueMap->dateStart = $espoEvent->getDateStart();
             $valueMap->dateEnd = $espoEvent->getDateEnd();
             $valueMap->location = $espoEvent->getLocation();
+            $valueMap->isAllDay = $espoEvent->isAllDay();
+
+            if ($espoEvent->isAllDay()) {
+                $valueMap->dateStartDate = $espoEvent->getDateStart();
+                $valueMap->dateEndDate = $espoEvent->getDateEnd();
+            }
         }
         catch (Throwable $e) {
             $this->log->warning("Error while converting ICS event '" . $entity->getId() . "': " . $e->getMessage());
@@ -158,6 +160,10 @@ class IcsDataLoader implements Loader
         $entity->set('icsEventData', $eventData);
 
         $entity->set('icsEventDateStart', $espoEvent->getDateStart());
+
+        if ($espoEvent->isAllDay()) {
+            $entity->set('icsEventDateStartDate', $espoEvent->getDateStart());
+        }
     }
 
     private function loadCreatedEvent(Entity $entity, EspoEvent $espoEvent, object $eventData): void
diff --git a/application/Espo/Core/Mail/Event/Event.php b/application/Espo/Core/Mail/Event/Event.php
index e89bb665b4..509b3770a8 100644
--- a/application/Espo/Core/Mail/Event/Event.php
+++ b/application/Espo/Core/Mail/Event/Event.php
@@ -55,10 +55,11 @@ class Event
 
     private $uid = null;
 
+    private $isAllDay = false;
+
     public function withAttendees(?string $attendees): self
     {
         $obj = clone $this;
-
         $obj->attendees = $attendees;
 
         return $obj;
@@ -67,7 +68,6 @@ class Event
     public function withOrganizer(?string $organizer): self
     {
         $obj = clone $this;
-
         $obj->organizer = $organizer;
 
         return $obj;
@@ -76,7 +76,6 @@ class Event
     public function withDateStart(?string $dateStart): self
     {
         $obj = clone $this;
-
         $obj->dateStart = $dateStart;
 
         return $obj;
@@ -85,7 +84,6 @@ class Event
     public function withDateEnd(?string $dateEnd): self
     {
         $obj = clone $this;
-
         $obj->dateEnd = $dateEnd;
 
         return $obj;
@@ -94,7 +92,6 @@ class Event
     public function withLocation(?string $location): self
     {
         $obj = clone $this;
-
         $obj->location = $location;
 
         return $obj;
@@ -103,7 +100,6 @@ class Event
     public function withName(?string $name): self
     {
         $obj = clone $this;
-
         $obj->name = $name;
 
         return $obj;
@@ -112,7 +108,6 @@ class Event
     public function withDescription(?string $description): self
     {
         $obj = clone $this;
-
         $obj->description = $description;
 
         return $obj;
@@ -121,7 +116,6 @@ class Event
     public function withTimezone(?string $timezone): self
     {
         $obj = clone $this;
-
         $obj->timezone = $timezone;
 
         return $obj;
@@ -130,17 +124,29 @@ class Event
     public function withUid(?string $uid): self
     {
         $obj = clone $this;
-
         $obj->uid = $uid;
 
         return $obj;
     }
 
+    public function withIsAllDay(bool $isAllDay): self
+    {
+        $obj = clone $this;
+        $obj->isAllDay = $isAllDay;
+
+        return $obj;
+    }
+
     public function getUid(): ?string
     {
         return $this->uid;
     }
 
+    public function isAllDay(): bool
+    {
+        return $this->isAllDay;
+    }
+
     public function getName(): ?string
     {
         return $this->name;
@@ -153,7 +159,7 @@ class Event
 
     public function getDateEnd(): ?string
     {
-        return $this->convertDate($this->dateEnd);
+        return $this->convertDate($this->dateEnd, true);
     }
 
     public function getLocation(): ?string
@@ -171,12 +177,26 @@ class Event
         return new self();
     }
 
-    private function convertDate(?string $value): ?string
+    private function convertDate(?string $value, bool $isEnd = false): ?string
     {
         if ($value === null) {
             return null;
         }
 
+        if ($this->isAllDay) {
+            $dt = DateTime::createFromFormat('Ymd', $value);
+
+            if ($dt === false) {
+                throw new RuntimeException("Could not parse '{$value}'.");
+            }
+
+            if ($isEnd) {
+                $dt->modify('-1 day');
+            }
+
+            return $dt->format(DateTimeUtil::SYSTEM_DATE_FORMAT);
+        }
+
         $timezone = $this->timezone ?? 'UTC';
 
         $dt = DateTime::createFromFormat('Ymd\THis', $value, new DateTimeZone($timezone));
diff --git a/application/Espo/Core/Mail/Event/EventFactory.php b/application/Espo/Core/Mail/Event/EventFactory.php
new file mode 100644
index 0000000000..0d40e9c355
--- /dev/null
+++ b/application/Espo/Core/Mail/Event/EventFactory.php
@@ -0,0 +1,72 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Mail\Event;
+
+use ICal\Event as U01jmg3Event;
+use ICal\ICal as U01jmg3ICal;
+
+use RuntimeException;
+
+class EventFactory
+{
+    public static function createFromU01jmg3Ical(U01jmg3ICal $ical): Event
+    {
+        /* @var $event U01jmg3Event */
+        $event = $ical->events()[0] ?? null;
+
+        if (!$event) {
+            throw new RuntimeException();
+        }
+
+        $dateStart = $event->dtstart_tz ?? null;
+        $dateEnd = $event->dtend_tz ?? null;
+
+        $isAllDay = strlen($event->dtstart) === 8;
+
+        if ($isAllDay) {
+            $dateStart = $event->dtstart ?? null;
+            $dateEnd = $event->dtend ?? null;
+        }
+
+        $espoEvent = Event::create()
+            ->withUid($event->uid ?? null)
+            ->withIsAllDay($isAllDay)
+            ->withDateStart($dateStart)
+            ->withDateEnd($dateEnd)
+            ->withName($event->summary ?? null)
+            ->withLocation($event->location ?? null)
+            ->withDescription($event->description ?? null)
+            ->withTimezone($ical->calendarTimeZone() ?? null)
+            ->withOrganizer($event->organizer ?? null)
+            ->withAttendees($event->attendee ?? null);
+
+        return $espoEvent;
+    }
+}
diff --git a/application/Espo/Resources/metadata/entityDefs/Email.json b/application/Espo/Resources/metadata/entityDefs/Email.json
index b48441b0b3..64048289c9 100644
--- a/application/Espo/Resources/metadata/entityDefs/Email.json
+++ b/application/Espo/Resources/metadata/entityDefs/Email.json
@@ -349,7 +349,7 @@
             "index": true
         },
         "icsEventDateStart": {
-            "type": "datetime",
+            "type": "datetimeOptional",
             "readOnly": true,
             "notStorable": true
         },
diff --git a/tests/unit/Espo/Core/Mail/Event/EventTest.php b/tests/unit/Espo/Core/Mail/Event/EventTest.php
index 502bc14ecd..ccde538d84 100644
--- a/tests/unit/Espo/Core/Mail/Event/EventTest.php
+++ b/tests/unit/Espo/Core/Mail/Event/EventTest.php
@@ -32,6 +32,7 @@ namespace tests\unit\Espo\Core\Mail\Event;
 use ICal\ICal;
 use ICal\Event;
 
+use Espo\Core\Mail\Event\EventFactory;
 use Espo\Core\Mail\Event\Event as MailEvent;
 
 class EventTest extends \PHPUnit\Framework\TestCase
@@ -113,6 +114,32 @@ END:VEVENT
 END:VCALENDAR
 ";
 
+    private $icsContents3 =
+"BEGIN:VCALENDAR
+PRODID:-//Google Inc//Google Calendar 70.9054//EN
+VERSION:2.0
+CALSCALE:GREGORIAN
+METHOD:REQUEST
+BEGIN:VEVENT
+DTSTART;VALUE=DATE:20210810
+DTEND;VALUE=DATE:20210811
+DTSTAMP:20210810T091857Z
+ORGANIZER;CN=test:mailto:test@group.calendar.google.c
+ om
+UID:4r15namb5v2h4dou58gkfajjbe@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=
+ TRUE;CN=test.com;X-NUM-GUESTS=0:mailto:test@test.com
+X-MICROSOFT-CDO-OWNERAPPTID:1443094082
+CREATED:20210810T091748Z
+LAST-MODIFIED:20210810T091856Z
+LOCATION:
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:test ics 4
+TRANSP:TRANSPARENT
+END:VEVENT
+END:VCALENDAR";
+
     public function testEvent1(): void
     {
         $ical = new ICal();
@@ -181,5 +208,20 @@ END:VCALENDAR
             "1 Broadway Ave., Brooklyn",
             $espoEvent->getLocation()
         );
+
+        $this->assertFalse($espoEvent->isAllDay());
+    }
+
+    public function testEvent3(): void
+    {
+        $ical = new ICal();
+
+        $ical->initString($this->icsContents3);
+
+        $event = EventFactory::createFromU01jmg3Ical($ical);
+
+        $this->assertTrue($event->isAllDay());
+        $this->assertEquals('2021-08-10', $event->getDateStart());
+        $this->assertEquals('2021-08-10', $event->getDateEnd());
     }
 }