when was pearl harbor

The attack on Pearl Harbor occurred on December 7, 1941. It was a surprise military strike by the Empire of Japan on the United States Pacific Fleet at its naval base in Pearl Harbor, Hawaii. This attack led to the United States entering World War II. The first Japanese dive-bomber appeared over Pearl Harbor at 7:55 AM local time, and the attack lasted just over an hour, involving two waves of assaults by nearly 200 Japanese aircraft. It caused significant damage to the U.S. naval fleet and resulted in more than 2,400 American military and civilian casualties.