How to import external file with date as name - excel

Question

I wanted to import or copy and paste data from an external file into the current Excel file using VBA. However, the external file contain a date of the previous month in it. For example, the external file name is Report_20221128. Every month, this external file date maybe different and not necessary be 28 of the month.
Here is what I have done so far.
Sub Report_Run()
Dim wb As Workbook
Dim file As Variant
Dim wbrow As Long, wbrow2 As Long, wbrow3 As Long
Day = Application.WorksheetFunction.EoMonth(Now(), "-1")
Set wb = Workbooks("Run Report " & VBA.Format(LDay, "ddmmyyyy") & ".xlsb")
wb.Worksheets("DD").Activate
wbrow3 = Cells(Rows.Count, "A").End(xlUp).Row
file = Dir(Environ("userprofile") & "\Desktop\Reports\Report_" & Format(Date, "yyyymmdd") & ".xlsx")
End Sub
However, the code unable to read on this line
file = Dir(Environ("userprofile") & "\Desktop\Reports\Report_" & Format(Date, "yyyymmdd") & ".xlsx")
Therefore, how should I set the code so that it can read this external file that contain any date of the previous month in it?

Answer 1

Import Worksheet From File Matching a Pattern
Sub ImportLastMonth()
' Constants
Const SRC_PATH_RIGHT As String = "\Desktop\Reports\"
Const SRC_FILE_LEFT As String = "Report_"
Const SRC_FILE_RIGHT As String = ".xlsx"
Const SRC_WORKSHEET_ID As Variant = "Sheet1" ' adjust! Name or Index
' Source Path
Dim sPathLeft As String: sPathLeft = Environ("USERPROFILE")
Dim sPath As String: sPath = sPathLeft & SRC_PATH_RIGHT
Dim sFolderName As String: sFolderName = Dir(sPath, vbDirectory)
If Len(sFolderName) = 0 Then
MsgBox "The path '" & sPath & "' was not found.", vbCritical
Exit Sub
End If
' Source File
Dim sPatternLeft As String: sPatternLeft = SRC_FILE_LEFT _
& Format(CDate(Application.EoMonth(Now, "-1")), "yyyymm")
Dim sPattern As String: sPattern = sPatternLeft & "*" & SRC_FILE_RIGHT
Dim sFileName As String: sFileName = Dir(sPath & sPattern)
If Len(sFileName) = 0 Then
MsgBox "No files matching the pattern '" & sPattern & "' in '" _
& sPath & "' found.", vbCritical
Exit Sub
End If
' Day
Dim DayStart As Long: DayStart = Len(sPatternLeft) + 1
Dim DayNumString As String, DayNum As Long, NewDayNum As Long
Do While Len(sFileName) > 0
DayNumString = Mid(sFileName, DayStart, 2)
If IsNumeric(DayNumString) Then
NewDayNum = CLng(DayNumString)
If NewDayNum > DayNum Then DayNum = NewDayNum
End If
Debug.Print sFileName, DayNumString, NewDayNum, DayNum
sFileName = Dir
Loop
If DayNum = 0 Then
MsgBox "No file found.", vbCritical
Exit Sub
End If
Application.ScreenUpdating = False
' Source
Dim sFilePath As String
sFilePath = sPath & sPatternLeft & Format(DayNum, "0#") & SRC_FILE_RIGHT
Dim swb As Workbook: Set swb = Workbooks.Open(sFilePath, True, True)
Dim sws As Worksheet: Set sws = swb.Sheets(SRC_WORKSHEET_ID)
' Destination
Dim dwb As Workbook: Set dwb = ThisWorkbook ' workbook containing this code
' Copy
sws.Copy After:=dwb.Sheets(dwb.Sheets.Count) ' last
swb.Close SaveChanges:=False
Application.ScreenUpdating = True
' Inform.
MsgBox "Last month's final report imported.", vbInformation
End Sub

Answer 2

Using FileSystemObject and Like
Option Explicit
Sub Report_Run()
Dim wb As Workbook, TargetWB As Workbook
Dim DT As Date
Dim wbrow As Long, wbrow2 As Long, wbrow3 As Long
Dim FSO As Object, oFolder As Object, oFile As Object
Set FSO = CreateObject("scripting.filesystemobject")
' > This needs to be the folder you expect to contain your report
Set oFolder = FSO.getfolder("C:\Users\cameron\Documents\")
' > Date is already a VBA function, you have to use a different variable
DT = Application.WorksheetFunction.EoMonth(Date, "-1")
' > I have this set to "ThisWorkbook" as it's fewer things to worry about, but feel free to change this. _
What is LDay? \|/ you don't have this variable declared
Set wb = ThisWorkbook 'workbooks("Run Report " & VBA.Format(LDay, "ddmmyyyy") & ".xlsb")
' > Avoid using activate
wbrow3 = wb.Worksheets("DD").Cells(Rows.Count, "A").End(xlUp).Row
' > Check each file to see if they're from last month
For Each oFile In oFolder.Files
If oFile.Name Like "Report_" & Format(DT, "yyyymm") & "*" & ".xlsb" Then 'Report name with wildcard for day
Set TargetWB = Workbooks.Open(oFile.Path)
Exit For
End If
Next oFile
' > You now have the report book from last month open and saved to "TargetWB"
End Sub