Header Date Modified - Adjusting Font Style and Size Problems

Help!

I found this way of adding code to the Header of my excel sheet so that it posted the Date Modified (as opposed to the current date). This all works fine, except when I tried to adjust the code to adjust the font style and size, it doesn't work properly.

This was what was recommended... and it works great!

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
    For Each ws In ActiveWorkbook.Worksheets
       ws.PageSetup.RightHeader = Format(Now, "mm/dd/yyyy hh:mm")
    Next
End Sub

This is how I adjusted the font style and size... the font works, the italics works... however the font size when I look at it is actually 409pts. HELP. What on earth is going on??

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
    For Each ws In ActiveWorkbook.Worksheets
       ws.PageSetup.RightHeader = "&""Avenir LT Book""&I&7" & Format(Now, "mm/dd/yyyy hh:mm")
    Next
End Sub

This adjusting code stuff is VERY new for me and right now I am just trying to find a quick fix for my client as they are trying to get their price sheets out the door... way over due.

ANY Help would be greatly appreciated!

Thanks!