The International Covenant on Economic, Social and Cultural Rights, adopted by the United Nations General Assembly, comes into force.

The International Covenant on Economic, Social and Cultural Rights (ICESCR) is a multilateral treaty adopted by the United Nations General Assembly (GA) on 16 December 1966 through GA. Resolution 2200A (XXI), and came into force on 3 January 1976. It commits its parties to work toward the granting of economic, social, and cultural rights (ESCR) to all individuals including those living in Non-Self-Governing and Trust Territories. The rights include labour rights, the right to health, the right to education, and the right to an adequate standard of living. As of February 2024, the Covenant has 172 parties. A further four countries, including the United States, have signed but not ratified the Covenant.

January 3 is the third day of the year in the Gregorian calendar; 362 days remain until the end of the year.