怎样根据身份证号计算出生日期

15位的

=IF(A2<>"",TEXT((LEN(A2)=15)*19&MID(A2,7,6+(LEN(A2)=18)*2),"#-00-00")+0,)

=IF(A2<>"",DATEDIF(TEXT((LEN(A2)=15)*19&MID(A2,7,6+(LEN(A2)=18)*2),"#-00-00"),TODAY(),"y"),)

18位的

=IF(A3<>"",TEXT((LEN(A3)=15)*19&MID(A3,7,6+(LEN(A3)=18)*2),"#-00-00")+0,)

=IF(A3<>"",DATEDIF(TEXT((LEN(A3)=15)*19&MID(A3,7,6+(LEN(A3)=18)*2),"#-00-00"),TODAY(),"y"),)