[ /** * Defines a custom format that is used when the field is saved */ 'format' => function (string $format = null) { return $format; } ], 'methods' => [ 'toDatetime' => function ($value, string $format = 'Y-m-d H:i:s') { if ($timestamp = timestamp($value, $this->step)) { return date($format, $timestamp); } return null; } ], 'save' => function ($value) { if ($value !== null && $timestamp = strtotime($value)) { return date($this->format, $timestamp); } return ''; }, ];