FORMAT(MONTHDELTA(b5,1),"yyMM")
CONCATENATE(if(AND(WEEK(B5,"F1")=1,month(B5)=12),RIGHT(YEAR(B5),2)+1,RIGHT(YEAR(B5),2)),FORMAT(WEEK(B5,"F1"),"00"))
增加一个判断周
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就是月份是12的,并且周次是1的,那就是跨年了,年份增加1
CONCATENATE(FORMAT('2024-12-29','YY'),FORMAT(week('2024-12-29','F1'),'00'))