title: Imperial Japanese Navy
context: The Imperial Japanese Navy (IJN; Kyūjitai: 大日本帝國海軍 Shinjitai: 大日本帝国海軍 Dai-Nippon Teikoku Kaigun "Navy of the Greater Japanese Empire", or 日本海軍 Nippon Kaigun,  "Japanese Navy") was the navy of the Empire of Japan from 1868 until 1945, when it was dissolved following Japan's defeat and surrender in World War II. The Japan Maritime Self-Defense Force (JMSDF) was formed after the dissolution of the IJN.[1]
question: When was the Imperial Japanese Navy formed?
answers: 1868