请输入任务描述
应该是这样
if(len(B1) = 0 || len(C1) = 0, "空", B1 - C1)
日期修改成
if(len(B1) = 0 || len(C1) = 0, "空", DATEDIF(b1,c1,"D"))
哎 又变
if(
(len(B1) = 0 || len(C1) = 0), "空",
(DATEDIF(b1,c1,"D")=0),1,DATEDIF(b1,c1,"D")))
if((A1-B1)<0, '空', A1-B1)
if(LEN(A1)==0||LEN(B1)==0,"",A1-B1)