C2=(-LOOKUP(1,-MID(B2,FIND("/",B2,FIND("/",B2)+1)+1,{2,4}))&"/"&-LOOKUP(1,-MID(B2,FIND("/",B2)+1,{1,2}))&"/"&-LOOKUP(1,-MID(B2,FIND("/",B2)-{1,2},{1,2})))*1
另解=DATE(RIGHT(20&-LOOKUP(1,-MID(B2,FIND("/",B2,FIND("/",B2)+1)+1,{2,4})),4),-LOOKUP(1,-MID(B2,FIND("/",B2)+1,{1,2})),-LOOKUP(1,-MID(B2,FIND("/",B2)-{1,2},{1,2})))

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