Function call results in type 13 mismatch - excel

Question

So close to completing a large project but cant seem to get past this mismatch. Any help would be appreciated. Hoping this is not too much info...
Getting an .xlsx single sheet file and need to add information to the data in a new book using a cross reference table to get business dates and periods. Here is a sample of the source book:
Sample data snippet
I got this code from #PGSystemTester as a vlookup solution to pull data off of a reference table using a date which would fall between dates in separate columns on the reference table.
Function rngLOOKUP(chkDate As Date, rngf As Range, theColumn As Long) As Variant
Dim acell As Range
For Each acell In rngf.Columns(1).Cells
If acell.Value <= chkDate And acell.Offset(0, 1).Value >= chkDate Then
rngLOOKUP = acell.Offset(0, theColumn - 1).Value
Exit Function
End If
Next acell
rngLOOKUP = "#Nothing"
End Function
I have searched and tried dozens of methods to format the date but cannot get past a type mismatch and am starting to wonder if it is actually the date that is the issue:
Here is a sample of the cross reference table:
Cross reference table sample
Each time I use this call to assign the result to a variable I get a run time error 13, type mismatch:
fYear = rngLOOKUP(aDate, rng, 3)
Here is the complete code. The source file is .xlsx and I format the cell the date comes from before assigning it to a variable.
Sub CleanDaily_Labour()
'
' CleanDaily_Labour Macro
' RMDC Payroll Resarch (MU) Report prep
'
Dim myPath, fName, refFILE, job, JobGR, DateST, WKDay, PDWK, fYear As String
Dim CRef, wkb As Workbook
Dim shtDATE, shtJOB, sht As Worksheet
Dim aDate, fYR As Date
Dim rngLOOKUP As Variant
Dim rng, rngJOBS, rngJBGRP As Range
Dim SC, lastRow, PD, WK As Long
Application.ScreenUpdating = False
myPath = Application.ActiveWorkbook.Path
'
' Get the file date and assign to variables
'
Range("D3").Select
Selection.NumberFormat = "yyyy-mm-dd"
aDate = Range("D3").Value
DateST = WorksheetFunction.Text(aDate, "YYYYMMDD")
WKDay = WorksheetFunction.Text(aDate, "DDD")
Selection.Copy
Range("D7").Select
ActiveSheet.Paste
'
' Rename and save the active workbook by date
' set wkb to new workbook name and assign calendar cross ref
'
fName = myPath & "\Daily_Labour" _
& DateST & ".xlsx"
ActiveWorkbook.SaveAs fName, 51
Set wkb = Workbooks.Open(fName)
Set sht = wkb.Sheets("Sheet1")
refFILE = myPath & "\Cross_Ref_fCalendar.xlsx"
'
' Remove extra header info
'
Rows("1:5").Select
Application.CutCopyMode = False
Selection.Delete Shift:=xlUp
'
' Insert Column to the left of Column D
'
Columns("E:G").Insert Shift:=xlToRight, _
CopyOrigin:=xlFormatFromRightOrBelow
'
' Update Headers that will be kept / used
'
Range("A1").Value = "FYear"
Range("E1").Value = "PD_WK"
Range("J1").Value = "JOB_GRP"
Range("F1").Value = "WKDay"
Range("G1").Value = "PD"
Range("H1").Value = "WK"
'
Rows("1:1").Select
With Selection
.HorizontalAlignment = xlCenter
End With
'
' Remove extra columns
'
Sheets("Sheet1").Range("K:K,M:P,R:AY").EntireColumn.Delete
'
' Get the last row and fill known columns
'
lastRow = Cells(Rows.Count, 1).End(xlUp).row
Range("d2:d" & lastRow).Value = aDate
'Range("d2:d" & lastRow).NumberFormat = "dd-mmm-yy" (commented as no impact on error, tried variantions here to overcome mismatch but should not matter as variable never changed here, just the range)
Range("f2:f" & lastRow).Value = WKDay
'
' Set variables for next steps
'
Set CRef = Workbooks.Open(refFILE)
Set shtJOB = CRef.Sheets("JobCross")
Set shtDATE = CRef.Sheets("fcalendar")
sht.Activate
Set rngJOBS = Range("i2:i" & lastRow)
Set rngJBGRP = shtJOB.Range("A1:b16")
Set rng = shtDATE.Range("A2:f210")
'
' Loop through jobs in column i match job in shtJOB
' put matching group in row j (Use Function vLookupVBA)
'
For Each jRow In rngJOBS
jRow.Select
job = ActiveCell.Value
JobGR = VLookupVBA(job, rngJBGRP, Null)
ActiveCell.Offset(0, 1).Value = JobGR
'end for
Next jRow
'
'Save Progress during testing:
'
Application.DisplayAlerts = False
ActiveWorkbook.SaveAs fName, 51
'
' Fill in date parameters from Cross Ref file for Business date
' Use function rngLOOKUP to update variables then set ranges to the variables
' May be more efficient to get row number from cross ref table instead - later.
'
' shtDATE.Activate (does not seem to affect)
'
fYear = rngLOOKUP(aDate, rng, 3) '**This results in the error**
PDWK = rngLOOKUP(aDate, rng, 6)
PD = rngLOOKUP(aDate, rng, 4)
WK = rngLOOKUP(aDate, rng, 5)
'
' Fill the columns with the variables (can likely bypass the variables and put on 1 line)- later
'
Range("A2:A" & lastRow).Value = fYear
Range("E2:E" & lastRow).Value = PDWK
Range("G2:G" & lastRow).Value = PD
Range("H2:H" & lastRow).Value = WK
'
' Cleanup, save and close workbooks
'
Application.DisplayAlerts = False
CRef.Close False
wkb.SaveAs fName, 51
'
' SQL call: Load to existing datbase (GDrive), use same format as Transactions
' ?? Get sales by day? vs maintain PDWK
'
Application.DisplayAlerts = True
Application.ScreenUpdating = True
End Sub

Answer 1

rngLOOKUP() expects a Date for its first parameter and a Range for its second parameter. However, you're passing it a Variant in each case. Hence, the type mismatch error. For example, in your code, you've declared aDate as follows...
Dim aDate, fYR As Date
This means that aDate is delcared as a Variant, not a Date, and fYR as a Date. So you'll need to change your delcaration statement as follows...
Dim aDate as Date, fYR As Date
Same thing with rng. And, it looks like the same thing for all your other declaration statements.