DATEDIF(G15,񓟼/8/31","Y")&"岁"&DATEDIF(G15,񓟼/8/31","YM")&"月"&DATEDIF(G15,񓟼/8/31","MD")

=TEXT(DATEDIF(G15,񓟼/8/31","D"),"YY岁M月D日")

公式中的񓟼/8/31"换成该日期所在单元格。