In 1927, the Kuomintang (KMT; Nationalist Party) under Generalissimo Chiang Kai-shek again established Nanjing as the capital of the Republic of China, and this became internationally recognized once KMT forces took Beijing in 1928. The following decade is known as the Nanking decade.

Answer this question, if possible (if impossible, reply "unanswerable"): When was Nanjing re-established as the capital of the Republic of China?
1927