public function during(Duration $duration)
{
$begin = new TimePoint($this->year, $this->month, $this->day, 0, 0);
$end = $begin->plus($duration);
return new DateInterval($begin->getDate(), $end->getDate());
}
public function isEquals(TimePoint $point)
{
return $this->date->isEquals($point->getDate()) && $this->time->isEquals($point->getTimeOfDay());
}
