diff --git a/application/Espo/Entities/Preferences.php b/application/Espo/Entities/Preferences.php
index 1292d7a40d..247e134e72 100644
--- a/application/Espo/Entities/Preferences.php
+++ b/application/Espo/Entities/Preferences.php
@@ -47,4 +47,9 @@ class Preferences extends \Espo\Core\ORM\Entity
     {
         return $this->get('timeZone');
     }
+
+    public function getLanguage(): ?string
+    {
+        return $this->get('language');
+    }
 }
diff --git a/application/Espo/Modules/Crm/Business/Event/Invitations.php b/application/Espo/Modules/Crm/Business/Event/Invitations.php
index cddbfc4aef..92eb96d4fd 100644
--- a/application/Espo/Modules/Crm/Business/Event/Invitations.php
+++ b/application/Espo/Modules/Crm/Business/Event/Invitations.php
@@ -66,6 +66,7 @@ class Invitations
 
     /**
      * Some dependencies are unused to keep backward compatibility.
+     * @todo Revise.
      */
     public function __construct(
         private EntityManager $entityManager,
@@ -75,6 +76,7 @@ class Invitations
         private TemplateFileManager $templateFileManager,
         private HtmlizerFactory $htmlizerFactory,
         private ApplicationConfig $applicationConfig,
+        private DateTimeUtil $dateTime,
     ) {}
 
     /**
@@ -282,7 +284,10 @@ class Invitations
         $data['entityType'] = $this->language->translateLabel($entity->getEntityType(), 'scopeNames');
         $data['entityTypeLowerFirst'] = Util::mbLowerCaseFirst($data['entityType']);
 
-        $data['timeZone'] = $this->getTimeZone($invitee);
+        [$timeZone, $language] = $this->getTimeZoneAndLanguage($invitee);
+
+        $data['timeZone'] = $timeZone;
+        $data['dateStartFull'] = $this->prepareDateStartFull($entity, $timeZone, $language);
 
         return $data;
     }
@@ -340,9 +345,13 @@ class Invitations
         return $attendees;
     }
 
-    private function getTimeZone(Entity $invitee): string
+    /**
+     * @return array{string, string}
+     */
+    private function getTimeZoneAndLanguage(Entity $invitee): array
     {
         $timeZone = $this->applicationConfig->getTimeZone();
+        $language = $this->applicationConfig->getLanguage();
 
         if ($invitee instanceof User) {
             $preferences = $this->entityManager
@@ -352,8 +361,36 @@ class Invitations
             if ($preferences && $preferences->getTimeZone()) {
                 $timeZone = $preferences->getTimeZone();
             }
+
+            if ($preferences && $preferences->getLanguage()) {
+                $language = $preferences->getLanguage();
+            }
         }
 
-        return $timeZone;
+        return [$timeZone, $language];
+    }
+
+    /**
+     * @todo Take into account the invitees time format if a user.
+     */
+    private function prepareDateStartFull(Entity $entity, string $timeZone, string $language): ?string
+    {
+        $format = "dddd, MMMM Do, YYYY";
+
+        if ($entity->get('dateStartDate')) {
+            $value = $entity->get('dateStartDate');
+
+            return $this->dateTime->convertSystemDate($value, $format, $language);
+        }
+
+        $value = $entity->get('dateStart');
+
+        if (!$value) {
+            return null;
+        }
+
+        $format = $this->applicationConfig->getTimeFormat() . ", " . $format;
+
+        return $this->dateTime->convertSystemDateTime($value, $timeZone, $format, $language);
     }
 }
diff --git a/application/Espo/Modules/Crm/Resources/templates/cancellation/de_DE/body.tpl b/application/Espo/Modules/Crm/Resources/templates/cancellation/de_DE/body.tpl
index 503605235c..c61ed6fa85 100644
--- a/application/Espo/Modules/Crm/Resources/templates/cancellation/de_DE/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/cancellation/de_DE/body.tpl
@@ -1,5 +1,5 @@
 <p>Betreff: {{name}}</p>
-<p>Start: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Start: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
 <p><a href="{{recordUrl}}">Eintrag öffnen</a></p>
 {{/if}}
diff --git a/application/Espo/Modules/Crm/Resources/templates/cancellation/en_US/body.tpl b/application/Espo/Modules/Crm/Resources/templates/cancellation/en_US/body.tpl
index 72b3d01cc7..f59f90d642 100644
--- a/application/Espo/Modules/Crm/Resources/templates/cancellation/en_US/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/cancellation/en_US/body.tpl
@@ -1,5 +1,5 @@
 <p>Subject: {{name}}</p>
-<p>Start: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Start: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
 <p><a href="{{recordUrl}}">View record</a></p>
 {{/if}}
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/de_DE/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/de_DE/body.tpl
index 871b6ff6ef..681c1cae10 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/de_DE/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/de_DE/body.tpl
@@ -1,5 +1,5 @@
 <p>Betreff: {{name}}</p>
-<p>Beginn: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Beginn: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/en_US/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/en_US/body.tpl
index b71112d8a4..ee116a25f5 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/en_US/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/en_US/body.tpl
@@ -1,5 +1,5 @@
 <p>Subject: {{name}}</p>
-<p>Start: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Start: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/es_ES/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/es_ES/body.tpl
index 161c53a937..e271842265 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/es_ES/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/es_ES/body.tpl
@@ -1,5 +1,5 @@
 <p>Asunto: {{name}}</p>
-<p>Comienzo: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Comienzo: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/fr_FR/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/fr_FR/body.tpl
index d143ae4aba..988f4ad477 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/fr_FR/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/fr_FR/body.tpl
@@ -1,5 +1,5 @@
 <p>Objet: {{name}}</p>
-<p>Débute à: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Débute à: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/ru_RU/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/ru_RU/body.tpl
index fc7dce1b2f..7bf0d88b78 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/ru_RU/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/ru_RU/body.tpl
@@ -1,5 +1,5 @@
 <p>Название: {{name}}</p>
-<p>Начало: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Начало: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/uk_UA/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/uk_UA/body.tpl
index 4c88fc84ee..a909340134 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/uk_UA/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/uk_UA/body.tpl
@@ -1,5 +1,5 @@
 <p>Назва: {{name}}</p>
-<p>Початок: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Початок: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/invitation/zh_CN/body.tpl b/application/Espo/Modules/Crm/Resources/templates/invitation/zh_CN/body.tpl
index a4d1017b2e..07b39ee39a 100644
--- a/application/Espo/Modules/Crm/Resources/templates/invitation/zh_CN/body.tpl
+++ b/application/Espo/Modules/Crm/Resources/templates/invitation/zh_CN/body.tpl
@@ -1,5 +1,5 @@
 <p>Subject: {{name}}</p>
-<p>Start: {{#if isAllDay}}{{dateStartDate}}{{else}}{{dateStart}} ({{timeZone}}){{/if}}</p>
+<p>Start: {{#if isAllDay}}{{dateStartFull}}{{else}}{{dateStartFull}} ({{timeZone}}){{/if}}</p>
 {{#if isUser}}
     {{#if description}}
     <p>{{{description}}}</p>