/**
* Converts time to date string and returns it.
* @param int|NULL $time
* @param string $format
* @return string
*/
public static final function time($time = NULL, $format = 'Y-m-d H:i:s')
{
if (TRUE === Kit::isNULL($time)) {
$time = time();
}
return date($format, $time);
}
