Fix #1172

app/Reaction.php

@@ -8,6 +8,11 @@ class Reaction extends Model
 {
     protected $primaryKey = 'message_mid';
 
+    protected $casts = [
+        'created_at' => 'datetime:Y-m-d H:i:s',
+        'updated_at' => 'datetime:Y-m-d H:i:s',
+    ];
+
     public function message()
     {
         return $this->belongsTo('App\Message');

app/widgets/Chat/Chat.php

@@ -729,11 +729,15 @@ class Chat extends \Movim\Widget\Base
 
             // This reaction was not published yet
             if ($emojis->where('emoji', $emoji)->count() == 0) {
+                $now = \Carbon\Carbon::now();
+
                 $reaction = new Reaction;
                 $reaction->message_mid = $parentMessage->mid;
                 $reaction->jidfrom = ($parentMessage->isMuc())
                     ? $this->user->session->username
                     : $this->user->id;
+                $reaction->created_at = $now;
+                $reaction->updated_at = $now;
                 $reaction->emoji = $emoji;
 
                 if (!$parentMessage->isMuc()) {