datetime型をDATEに変換してwhere

rails where date datetime https://stackoverflow.com/questions/45436232/rails-convert-datetime-to-date-in-where-query/45436533 ``` scope :day, -> (start_date) {where("DATE(start_date) = ?", start_date)} ``` ``` Schedule.where("DATE(expired_at) = ?", Time.zone.today + Schedule::EXPIRED_PERIOD) ```