Reporting add-in build data
 

I would like a Help|About command on the menu created when my add-in
is loaded.
In it I'd like to report a Version number and the timestamp for when I
last modified the
add-in. Here's what I have written:

Set wkbWkb = ThisWorkbook
strFileName = wkbWkb.Name
Set wksWks = wkbWkb.Worksheets("UserData")

strPath = wkbWkb.Path & "\" & strFileName
varDate = FileDateTime(strPath)

iCol = GetColIndex2(wksWks, "VERSION")
strVersion = wksWks.Cells(2, iCol)
strMsg = "JOC Membership Macro Package Version " & strVersion & "
Last modified " & varDate
MsgBox strMsg

As you can see, I get teh Version number out of cell stored in a
worksheet belonging to the add-in workbook.
That works fine.

What doesn't work is the way I attempt to get the "build date." I
would think that varDate would be reported
as the timestamp I see in Windows Explorer, i.e., the date I last
modified the .xla file. Instead, I get
a time stamp that seems to be the time the add-in is loaded.

Why does it behave this way? How can I get it to report the actual
last-modified date/time?

TIA

Ed