The Danish Ministry for Environment and Food will also “enter into an agreement with the Danish Chamber of Commerce, Coop and other parties to reduce Danes' consumption of carrier bags by 50 percent by 2023.”
The effective date of the ban was not provided in the government’s news release.
Source: Danish Government to Ban Use of Lightweight Plastic Carrier Bags and Require a Fee for Use of Thicker more Durable Bags, December 4, 2018