The Battle of Midway was being fought in earnest.
The Japanese launched aircraft to attack Midway Atoll at 04:30, the same time that the Yorktown launched ten aircraft to search for the Japanese fleet. AT 0534 a PBY from Midway itself sighted Japanese ships. At 0710 aircraft launched from Midway, including six TBF's and four B-26s bombers attacked the Japanese. Over the course of the entire day, various strikes and countries would occur, mostly from carriers.
The Japanese carriers Akagi, Kaga and Soryu were all lost to the Japanese due to planes from the Enterprise and Yorktown. The Yorktown had to be abandoned after it was hit by planes launched from the Hiryu, which itself was hit by U.S. carrier planes subsequently. It would be scuttled the following day.
While the Japanese seemingly didn't appreciate it, the battle was the turning point in the war in the Pacific. The Japanese had been decisively defeated and would never regain the initiative nor be able to make good their losses. The turning of the tide essentially came down to a single day.
A second day of raids occurred at Dutch Harbor.