The proclamation of George V as Emperor of India and the announcement of the shift of the capital from Calcutta to Delhi took place during the Delhi Durbar on December 12, 1911. The Delhi Durbar was a grand event held to celebrate the coronation of a new monarch or significant events related to the British Empire in India.

During the Durbar, George V made the historic announcement that the capital of British India would be moved from Calcutta to Delhi. The decision to shift the capital was influenced by various factors, including strategic considerations, as Delhi was more centrally located, and the British wanted a symbolic shift that would emphasize their control over the entire subcontinent.

The construction of New Delhi, the new capital, began in 1912 and continued for several years. Sir Edwin Lutyens and Sir Herbert Baker were the chief architects responsible for the design and layout of New Delhi. The city was officially inaugurated as the capital in 1931.

The decision to move the capital from Calcutta to Delhi had far-reaching consequences and marked an important chapter in India's history under British rule. It was a symbolic and administrative change that reflected the evolving dynamics of British imperial control in the Indian subcontinent.