In the United States, no work created since 1923 has entered the public domain by means of the expiration of the copyright. Coincidentally enough, the date is just prior to the advent of Mickey Mouse. Works that did expire were retroactively given their copyright back. You can be sure that, if no one does anything to stop it, the length of time that a copyright applies will be extended yet again by lobbying on behalf of a cadre of corporations that hold intellectual property. This is unconstitutional.
Copyright lasts the life of the author plus 70 years. And that's if the owner is an individual; if the owner is a corporation, the copyright lasts 95 years. By any measure, the terms of current copyright law do not meet the stated intent in the Constitution of "limited times."