Joel,
You didn't quote the relevant parts of the message to which you replied, but
in reply to your:
">> Now finally a good question. A US member of the USMC trying to
.... , I said:
"The thing which determines how Excel interprets dates is not "different
versions for different countries". It's determined by the Windows Regional
Options, set through Control Panel."
You were talking not about how the number is *displayed*, but how it is
*entered*.
The cell formatting governs the *display*, and changing the format will not
change the underlying number if a date has been wrongly interpreted at the
time of entry.
The Windows Regional Settings governs the interpretation of numbers that are
*entered".
You are quite corrrect that it is safer to use an unambiguous format.
The ISO 8601 standard format is 2009-10-18