By what date had the Zakat system been fully enforced during the lifetime of the Prophet (P.B.U.H)?

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By what date had the Zakat system been fully enforced during the lifetime of the Prophet (P.B.U.H)? Answer: Muharram of 9 A.H.

The Zakat system was fully organized and enforced during the lifetime of Prophet Muhammad (P.B.U.H) by Muharram 9 A.H.. Zakat became a formal Islamic obligation after the establishment of the Islamic state in Madinah, with rules regarding collection and distribution.

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