Where did Naruto mention Naruto's birthday?

Iruka's birthday for Naruto is episode 482.

During the Gokage talks, Uchiha Obito announced the start of the Gokage talks, and the villages began to make preparations. At this time, he released Harle to Naruto and Woody Sakura with Inula. After entering the dreamland, Woody Sakura and Naruto exchanged identities, and Naruto's parents were still alive. Naruto was immersed in illusion at this time. Later, Woody Sakura woke Naruto, and Naruto came home a little lost. At this time, Iruka prepared a birthday cake for Naruto's birthday.