Baron was a Bakumatsu period Japanese samurai, and the second Imperial Governor of former Sendai Domain in the TÃ Âhoku region of northern Japan.
Muneatsu was the second son of Date Munenari, daimyà  of Uwajima Domain, and was adopted by Date Yoshikuni in March 1868 as his heir. At that time, he was given the Court rank of Junior Fourth, Lower Grade and courtesy titles of Sakon Daiyu and Jijà «. Later that year, Sendai Domain and the à Âuetsu Reppan Dà Âmei were defeated in the Boshin War of the Meiji Restoration, and Yoshikuni resigned his offices and went into voluntary retirement and seclusion in Tokyo. The new Meiji government ordered that his fourth son, the two-year-old Date Munemoto become daimyà  of a much reduced Sendai Domain.
In 1869, the office of daimyà  was eliminated by the new government, and Munemoto became Imperial Governor of Sendai: however, as he was still a small child, the government ordered that he be replaced by Muneatsu in 1870. Munemoto retained his position as the hereditary chieftain of the Date clan.
Following the abolition of the han system in 1871, Muneatsu was sent by the Meiji government to England for studies. He remained in England for five years, returning to Japan in February 1875. In 1884, he set up his own household separate from the main Date clan, and on May 11, 1889, was granted the title of danshaku (baron) in the new kazoku peerage system. Starting in July 1890, he served for four terms in the House of Peers in the Diet of Japan.
On June 20, 1900, he was advanced to Third Court Rank. On his death in 1911 at the age of 56, his title went to his son Date Munetsune.