When did Hong Kong become a British colony?

Hong Kong became a British colony in 1941.

January 26, 1841: After the First Opium War, the British occupied Hong Kong Island. Afterwards, the Qing government tried to regain it by force. Emperor Daoguang issued many edicts to this end, but the Qing Dynasty could never Defend territorial integrity.

August 29, 1842: The Qing government signed the unequal Treaty of Nanjing (formerly known as the Treaty of Jiangning) with the United Kingdom, ceding Hong Kong Island to the United Kingdom.

October 24, 1860: China and Britain signed the unequal Treaty of Beijing, ceding the area south of Boundary Street on the Kowloon Peninsula to Britain.

June 9, 1898: The British forced the Qing government to sign the "Hong Kong Boundary Expansion Ordinance" and leased the area north of Boundary Street on the Kowloon Peninsula and 262 nearby islands for a period of 99 years (until 1997 Ends June 30).