IF(dateInWeek(DATEDELTA(TODAY(),-(WEEK(TODAY())-"周数单元格")*7),1)=="开始时间参数",dateInWeek(DATEDELTA(TODAY(),-(WEEK(TODAY())-"周数单元格")*7),1),"开始时间参数")+"--"+IF(dateInWeek(DATEDELTA(TODAY(),-(WEEK(TODAY())-"周数单元格")*7),-1)=="结束时间参数",dateInWeek(DATEDELTA(TODAY(),-(WEEK(TODAY())-"周数单元格")*7),-1),"结束时间参数")