diff --git a/src/Core/Models/Discussion.php b/src/Core/Models/Discussion.php
index bb409cf98..7444084bc 100755
--- a/src/Core/Models/Discussion.php
+++ b/src/Core/Models/Discussion.php
@@ -47,7 +47,6 @@ class Discussion extends Model
      *
      * @var array
      */
-    protected $dates = ['start_time', 'last_time'];
 
     /**
      * An array of posts that have been added during this request.
@@ -62,6 +61,7 @@ class Discussion extends Model
      * @var \Flarum\Core\Models\Post[]
      */
     public $removedPosts = [];
+    protected static $dates = ['start_time', 'last_time'];
 
     /**
      * The user for which the state relationship should be loaded.
diff --git a/src/Core/Models/Model.php b/src/Core/Models/Model.php
index e03e5b0d9..e3964d162 100755
--- a/src/Core/Models/Model.php
+++ b/src/Core/Models/Model.php
@@ -17,19 +17,26 @@ use LogicException;
  *
  * @todo Refactor out validation, either into a trait or into a dependency.
  *       The following requirements need to be fulfilled:
- *       - Ability for extensions to alter ruleset.
+ *       - Ability for extensions to alter ruleset (add, modify, remove).
  *       - Ability for extensions to add custom rules to the validator instance.
  *       - Use Flarum's translator with the validator instance.
  */
 abstract class Model extends Eloquent
 {
     /**
-     * Indicates if the model should be timestamped. Turn them off by default.
+     * Indicates if the model should be timestamped. Turn off by default.
      *
      * @var boolean
      */
     public $timestamps = false;
 
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    public static $dates = [];
+
     /**
      * The validation rules for this model.
      *
@@ -162,6 +169,26 @@ abstract class Model extends Eloquent
         return $rules;
     }
 
+    /**
+     * Get the attributes that should be converted to dates.
+     *
+     * @return array
+     */
+    public function getDates()
+    {
+        return static::$dates;
+    }
+
+    /**
+     * Add an attribute to be converted to a date.
+     *
+     * @param string $attribute
+     */
+    public static function addDate($attribute)
+    {
+        static::$dates[] = $attribute;
+    }
+
     /**
      * Get an attribute from the model. If nothing is found, attempt to load
      * a custom relation method with this key.
diff --git a/src/Extend/Model.php b/src/Extend/Model.php
index 7cf2fa6af..4b8695a34 100644
--- a/src/Extend/Model.php
+++ b/src/Extend/Model.php
@@ -32,6 +32,11 @@ class Model implements ExtenderInterface
         return $this;
     }
 
+    public function date($attribute)
+    {
+        $this->dates[] = $attribute;
+    }
+
     public function hasOne($relation, $related, $foreignKey = null, $localKey = null)
     {
         $this->relations[$relation] = function ($model) use ($relation, $related, $foreignKey, $localKey) {
@@ -73,7 +78,7 @@ class Model implements ExtenderInterface
         $model = $this->model;
 
         foreach ($this->relations as $relation => $callback) {
-            $model::addRelationship($relation, $callback);
+            $model::setRelationMethod($relation, $callback);
         }
 
         foreach ($this->scopeVisible as $callback) {
@@ -83,5 +88,9 @@ class Model implements ExtenderInterface
         foreach ($this->allow as $info) {
             $model::allow($info['action'], $info['callback']);
         }
+
+        foreach ($this->dates as $attribute) {
+            $model::addDate($attribute);
+        }
     }
 }