What is the expiry of South African Patent?

eg.: ZA 2004/01584 On https://iponline.cipc.co.za/ the expiry is 2024-02-26. However, the international filing date of PCT/US02/26504 is 21/08/2002, therefore, it should be 21/08/2022.

P.S.: The ZA 2004/01584 is expired due to non-payment but this is just for an example.

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