src/Peach/DT/Datetime.php
public function toTimestamp()
    {
        return new Timestamp($this->year, $this->month, $this->date, $this->hour, $this->minute, 0);
    }
public function toTimestamp()
    {
        return new Timestamp($this->year, $this->month, $this->date, $this->hour, $this->minute, 0);
    }
このオブジェクトを Timestamp 型にキャストします.
この時刻の 0 秒を表す Timestamp オブジェクトを返します.

@return Timestamp このオブジェクトの timestamp 表現