During the final stages of World War II in 1945, the United States conducted atomic raids on the Japanese cities of Hiroshima and Nagasaki, the first on August 6, 1945, and the second on August 9, 1945. These two events were the only times nuclear weapons have been used in combat.

How long will it take Earth to recover from nuclear war?

Recovery would probably take about 3-10 years, but the Academy's study notes that long term global changes cannot be completely ruled out. The reduced ozone concentrations would have a number of consequences outside the areas in which the detonations occurred.

When was the last nuclear bomb test?

9/23/1992: The U.S. conducted its last nuclear test, code named Divider, at an underground facility in Nevada. It was the last of the 1,032 nuclear tests carried out by the United States since The Trinity Test 47 years earlier.