=(LEFT(A1,4)-1)*365+INT(LEFT(A1,4)/4)+IF(MID(A1,6,SEARCH("/",A1,7)-6)-7<=0,(MID(A1,6,SEARCH("/",A1,7)-6)-1)*31,(MID(A1,6,SEARCH("/",A1,7)-6)-7)*30+6*31)+MID(A1,SEARCH("/",A1,7)+1,LEN(A1)-SEARCH("/",A1,7))-466710