Day After Tomorrow (also known as dat) was a 3-member Japanese pop band under the Avex label.

As of the release of their best albums in August 2005, Day After Tomorrow had gone on hiatus.

Daisuke Suzuki went on to play keyboard for the band Girl Next Door.

Misono's older sister is Koda Kumi.

Day After Tomorrow performed the theme song "More than a Million Miles" for the Japanese release of the movie The Day After Tomorrow.