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The flag of Kuala Lumpur, Malaysia was officially adopted on 14 May 1990 to commemorate the Dewan Bandaraya Kuala Lumpur (DBKL) or Kuala Lumpur City Hall's 100 years as the local authority of Kuala Lumpur. The flag was designed as a variant to Jalur Gemilang, the Flag of Malaysia, incorporating design elements with its own identity as one of the Federal Territories of the nation. The flag is flown annually on the first day of February, commemorating the day when Kuala Lumpur became a Federal Territory on 1 February 1974.

Source: Wikipedia