# File lib/facets/more/times.rb, line 244
  def next_week(day = :monday)
    days_into_week = { :monday => 0, :tuesday => 1, :wednesday => 2,
                       :thursday => 3, :friday => 4, :saturday => 5,
                       :sunday => 6 }
    since(1.week).beginning_of_week.since(days_into_week[day].day).change(:hour => 0)
  end