="Summary Data For Period "&TEXT(MIN(Data!B:B),"dd-mmm-yyyy")&" To
"&TEXT(MAX(Data!B:B),"dd-mmm-yyyy")

Signature
HTH
Bob Phillips
(replace somewhere in email address with gmail if mailing direct)
> I require as a header, Report From (min Date) to (max Date)
>
[quoted text clipped - 4 lines]
> however the dates are returned as excel values rather than dates. How
> can i format them as dates?