获取第几周(如第12周)
="第"&WEEKNUM(TODAY())&"周"
获取星期几(如星期一)
=TEXT(TODAY(),"aaaa")
获取当前日期(如2019/2/1)
=TODAY()
取绝对值
=ABS(B6-B8)
xxx标签页的c列,如果单元格内容包含已解决,则计数加一
=COUNTIF(xxx!C:C,"已解决")