gistfile1.rb

  def generate_expire_at(time = Time.now)
    #patek od 5 az nedele pulnoc
    if time.wday == 0 || time.wday == 6 || (time.wday == 5 && time.hour > 15)
      return Chronic.parse('this monday 10:00AM').strftime("%Y-%m-%dT%H:%M")
    end
    # po 4te hodine
    if time.hour > 15
      return Chronic.parse('tommorow 10:00AM').strftime("%Y-%m-%dT%H:%M")
    end
    # pred 8mou
    if time.hour < 8
      return Chronic.parse('today 10:00AM').strftime("%Y-%m-%dT%H:%M")
    end
    # jinak vzdy za dve hodiny
    return (time + 2.hours).strftime("%Y-%m-%dT%H:%M")
  end