在我看来,关键是从每个文件名中提取日期/时间,以便您可以比较它们以找出其中最新的。
这是一个立即窗口会话,用于测试下面包含的功能。如果找不到表示有效日期的字符串,该函数将返回 null。
? DateFromFilename("my_music_02_10_2013_01_58_07_PM.csv")
2/10/2013 1:58:07 PM
? DateFromFilename("my_music_no_date_here.csv")
Null
Public Function DateFromFilename(ByVal pFileName As String) As Variant
Dim strBaseName As String
Dim strDate As String
Dim strPieces() As String
Dim varReturn As Variant
varReturn = Null
strBaseName = Split(pFileName, ".")(0)
'Debug.Print "strBaseName: " & strBaseName
strPieces = Split(strBaseName, "_")
If UBound(strPieces) = 8 Then
strDate = strPieces(4) & "-" & strPieces(2) & _
"-" & strPieces(3) & " " & strPieces(5) & ":" & _
strPieces(6) & ":" & strPieces(7) & " " & strPieces(8)
End If
'Debug.Print "strDate: " & strDate
If IsDate(strDate) Then
varReturn = CDate(strDate)
End If
DateFromFilename = varReturn
End Function