 Although it was a peak, that was not the busiest online shopping day of that year.The busiest online shopping days were December 12 and 13, almost two weeks later; the second Monday in December has since become known as Green Monday.Another notable day is Free Shipping Day, a promotional day that serves as the last day in which a person can order a good online and have it arrive via standard shipping (the price of which the sender pays) prior to Christmas Eve; this day is usually on or near December 16.