根据某年某月第几个星期几返回当日日期的函数

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1. Function WeekDayStrToSolarDate(DateStr As String) As Date
   
2. '根据某年某月的第几周的星期几字符串返回当日日期
   
3. '如:WeekDayStrToSolarDate("20090621")返回2009年6月第二个星期日的日期06/14/2009
   
4. '如果第7位是5的话,返回此月最后一个
   
5. 
   
6. Dim Y As Integer, M As Byte, N As Byte, W As Byte
   
7. Dim tempDate As Date, tempW As Integer
   
8. Dim AddDay As Integer
   
9. Y = Left(DateStr, 4): M = Mid(DateStr, 5, 2): N = Mid(DateStr, 7, 1): W = Mid(DateStr, 8, 1)
   
10. If N < 5 Then '第N个
    
11. tempDate = DateSerial(Y, M, 1)
    
12. tempW = Weekday(tempDate)
    
13. AddDay = (N - 1) * 7 + (W - tempW)
    
14. If tempW > W Then AddDay = AddDay + 7
    
15. WeekDayStrToSolarDate= DateAdd("D", AddDay, tempDate)
    
16. Else '最后一个
    
17. tempDate = DateSerial(Y, M + 1, 1)
    
18. tempW = Weekday(tempDate)
    
19. AddDay = W - tempW
    
20. If tempW <= W Then AddDay = AddDay - 7
    
21. WeekDayStrToSolarDate= DateAdd("D", AddDay, tempDate)
    
22. End If
    
23. 
    
24. End Function

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为什么一次发这么多贴？