This code shows you how to display when a page was last modified .

<%
Set fso = Server.CreateObject("Scripting.FileSystemObject")
Set myFile = fso.GetFile(Server.MapPath("datemodified.php"))
dateModified = myFile.DateLastModified
%>

Now to display the the message enter the following where you wish it to appear

<%
Response.Write(dateModified)
Set myFile = nothing
Set fso = nothing
%>