Let me start by asking what you expected the formula to return?
DATEVALUE is supposed to return a numerical date from a text expression,
if you just want the date serial number format A2 as general. It doesn't
make any sense using
DATEVALUE on a date that is already numerical.
Apart from pedagogical reasons DATEVALUE is an obsolete formula that I
suspect
was incorporated into Excel when they copied the major spreadsheet at the
time Lotus 123.
You might as well use VALUE or +0, *1, or -- to convert a date text string
into a real Excel date that can be used for calculations but using it the
way you were does not make any sense.
--
Regards,
Peo Sjoblom