documentation/_date_time_formatter_interface_8php_source.html

 <?php
 namespace Magento\Framework\Stdlib\DateTime;

 interface DateTimeFormatterInterface
 {
     public function formatObject($object, $format = null, $locale = null);
 }
Magento\Framework\Stdlib\DateTime\DateTimeFormatterInterface
Definition: DateTimeFormatterInterface.php:12

Magento\Framework\Stdlib\DateTime
Definition: DateTime.php:7

$format
$format
Definition: list.phtml:12

Magento\Framework\Stdlib\DateTime\DateTimeFormatterInterface\formatObject
formatObject($object, $format=null, $locale=null)