月份簡稱 改英文月份 (11701)

C2=LOOKUP(1,0/(TEXT(ROW($1:$12)&-1,"MMM")=B2),TEXT(ROW($1:$12)&-1,"MMMM"))

D2=LOOKUP(1,0/(TEXT(ROW($1:$12)&-1,"MMMM")=C2),TEXT(ROW($1:$12)&-1,"MMM"))