UserFieldHistory::save

static function save()
{
	$ary = array();
	foreach(self::$items as $entityTypeID => $time)
	{
		$ary[CCrmOwnerType::ResolveName($entityTypeID)] = $time->format(\DateTime::ISO8601);
	}

	Main\Config\Option::set('crm', 'crm_uf_history', serialize($ary), '');
}