Add timezone aliases

app/Models/User.php

@@ -92,6 +92,15 @@ class User extends Authenticatable
         return $this->getPilotIdAttribute();
     }
 
+    /**
+     * Return the timezone
+     * @return mixed
+     */
+    public function getTzAttribute()
+    {
+        return $this->timezone;
+    }
+
     /**
      * @param mixed $size Size of the gravatar, in pixels
      * @return string