What was the date the IJN Yamato was sunk?

Operation Ten-Go committed the Yamato (the largest battleship to have ever been built) and nine escorts (the cruiser Yahagi and eight destroyers) to Okinawa and, in concert with kamikaze and Okinawa-based army units, attacked the Allied forces assembled on and around Okinawa.

The Allies having intercepted and decoded the movement order and the location of the Yamato later confirmed by submarine sightings, then moved to intercept the Japanese strike force.

At about 12:30, on 7 April 1945, 280 bomber and torpedo bomber aircraft arrived over the Japanese force. At 12:41 the first bombs struck the Yamato. From the first attack at 12:41 to the explosion at 14:23, Yamato was hit by at least eleven torpedoes and six bombs. There may have been two more torpedo and bomb hits, but this is not confirmed. Yamato sank rapidly, losing an estimated 3,055 of her 3,332 crew, including fleet commander Vice-Admiral Seiichi Itō. The few survivors were recovered by the four surviving destroyers, which withdrew to Japan.