1、按照每月计算周 =YEAR(A1) & "年" & MONTH(A1) & "月" & "第" & INT(DAY(A1)/7+1) & "周"2、按照日历计算周=IF(AND(WEEKDAY(DATE(YEAR(A1),1,1),2) > 1,FLOOR(DATEDIF(DATE(YEAR(A1),1,1),A1+WEEKDAY(DATE(YEAR(A1),1,1)-8,2),"D")/7,1)=0), FLOOR(DATEDIF(DATE(YEAR(A1)-1,1,1),DATE(YEAR(A1),1,1)+WEEKDAY(DATE(YEAR(A1)-1,1,1)-8,2),"D")/7,1), FLOOR(DATEDIF(DATE(YEAR(A1),1,1),A1+WEEKDAY(DATE(YEAR(A1),1,1)-8,2),"D")/7,1))3、按照日历计算周（区别上年最后一周(0)，本年最后一周(52)）=ROUNDUP((A1-DATE(YEAR(A1),1,)+MOD(WEEKDAY(DATE(YEAR(A1),1,),2),7))/7,0)-1
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