diff --git a/src/services/Indexes.php b/src/services/Indexes.php
index f78aca2..76d5f5b 100644
--- a/src/services/Indexes.php
+++ b/src/services/Indexes.php
@@ -461,15 +461,21 @@ public function buildMapping(): array
         $mapping = [];
 
         $predefinedAttributes = [
-            'title',
-            'slug',
-        ];
-
-        foreach ($predefinedAttributes as $attribute) {
-            $mapping[$fieldPrefix . 'attribute_' . $attribute] = [
+            'title' => [
+                'type' => 'text',
+                'analyzer' => 'standard',
+            ],
+            'slug' => [
                 'type' => 'text',
                 'analyzer' => 'standard',
-            ];
+            ],
+            'postDate' => [
+                'type' => 'date',
+            ],
+        ];
+
+        foreach ($predefinedAttributes as $attribute => $config) {
+            $mapping[$fieldPrefix . 'attribute_' . $attribute] = $config;
         }
 
         /**
diff --git a/src/services/Search.php b/src/services/Search.php
index e0562e8..7f26971 100644
--- a/src/services/Search.php
+++ b/src/services/Search.php
@@ -71,6 +71,10 @@ public function indexElementAttributes(ElementInterface $element, ?array $fieldH
             $keywords['attribute_' . $attribute] = $element->getSearchKeywords($attribute);
         }
 
+        if(isset($element->postDate) && $element->postDate instanceof \DateTime) {
+            $keywords['attribute_postDate'] = $element->postDate->format(\DateTime::ATOM);
+        }
+
         // Update the custom fields' keywords
         foreach ($updateFields as $field) {
             $fieldValue = $element->getFieldValue($field->handle);