January 30, 2018 all-day
June 30, 1997. The crested flag of the British Crown Colony was officially lowered at midnight and replaced by a new flag (marked by the bauhinia flower) representing Chinas sovereignty and the official transfer of power. Though Britain owned Hong Kong in perpetuity, the land areas surrounding the city were leased from China and the lease expired July 1, 1997. Rather than renegotiate a new lease, Britain ceded its claim to Hong Kong.
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