February 28

• February 28, 380
  Theodosius I declares the Catholic Church the only legitimate Imperial religion, ending official state support for the traditional Hellenistic religions and customs
• February 28, 870
  Fourth Council of Constantinople, eighth ecumenical council ends in Constantinople
• February 28, 1667
  English colony Suriname becomes in Dutch hands
• February 28, 1813
  Russia and Prussia form the Kalisz union against Napoleon
• February 28, 1922
  Due to raise of the Egyptian nationalist movement, United Kingdom government issues a unilateral declaration of Egypt's independence, which ends British protectorate over Egypt
• February 28, 1935
  Wallace Carothers, the leader of organic chemistry at DuPont company, manufactures first nylon, a synthetic polymer processed into fibres, films or shapes
• February 28, 1942
  Japanese land in Java, last Allied bastion in Dutch East Indies
• February 28, 1953
  Cambridge University scientists James Watson and Francis Crick announce that they have determined the double-helix structure of DNA, or deoxyribonucleic acid, the molecule containing human genes
• April 25, 1953
  Francis Crick and James D. Watson publish an article describing the double helix structure of DNA
• February 28, 1975
  The first Lomé Agreement, a trade and aid agreement, is signed between the European Community and 46 developing nations in Africa, the Caribbean and Asia
• February 28, 1982
  Hama massacre, an attempt to suppress Islamist uprising in Syria, leads to more than 10,000 deaths
• February 28, 1991
  United States led coalition grants Iraq a cease fire, after allied forces defeat Iraqi military forces and liberates Kuwait in Operation Desert Storm, marking end of Gulf War
• February 28, 1994
  United States F-16 pilots shoot down four Serbian fighter aircraft over Bosnia-Herzegovina for violation of the Operation Deny Flight and its no-fly zone
• February 28, 2002
  The Austrian schilling, Belgian franc, Finnish mark, German mark, Greek drachm, Italian lira, Luxembourg franc, Portuguese escudo, and Spanish peseta expires as valid currencies