I should have asked you for your formula, but no matter. Just put your
formula (minus the leading equal sign) in where I have indicated in the
formulas below.
You will not be able to produce a "real" date using those codes; rather, you
will only be able to produce a text string that looks like a date. Here is a
general function call that will produce the month code for the specified
date...
=CHOOSE(MONTH(<<date>>),"JA","FE","MR","AL","MA","JN","JL","AU","SE","OC","NO","DE")
where you would put your formula that returns a date in for my <<date>>
place holder. To create a date-looking string from this, just concatenate on
(in whatever order you want) the day and year parts. For example, to produce
a date in this format, ddmmyyyy, such as 25NO2008, use a construction like
this...
=TEXT(<<date>>,"dd")&CHOOSE(MONTH(<<date>>),"JA","FE","MR","AL","MA","JN","JL","AU","SE","OC","NO","DE")&YEAR(<<date>>)