[OS X TeX] day of week in LaTeX for an arbitrary date

[Ramón Figueroa-Centeno]

Aloha,

In the document below I change the month, day and year, but \weekday in
eukdate does not reflect those changes. So when I typeset today (May 2,
2009) I get "Saturday, May 1, 2009" for \today instead of "Friday, May 1,
2009". 

Does anybody know what's wrong? How do I force eukdate to use my redefined
\day, \month and \year in its computations? Is there any package in TeX Live
2008 that does what I want?

(I would prefer not to use dates.sty
<http://tug.ctan.org/get/macros/latex209/contrib/misc/dates.sty> or dow
<http://tug.ctan.org/tex-archive/macros/generic/misc/dow.tex>; the first
because it is not part of a modern LaTeX installation (TeX Live) and the
second because it is clunky.)

Thanks,

Ramón

\documentclass{article}

% \changedate{month}{day}{year} changes the LaTeX date
\newcommand{\changedate}[3]{
\renewcommand{\month}{#1} 
\renewcommand{\day}{#2} 
\renewcommand{\year}{#3}
}

% Package to get weekday and month name.
\usepackage{eukdate}

% Change the \today command to show the day of the week
\renewcommand{\today}{\weekday, \monthname\ \day, \year}

\begin{document}

% \changedate{month}{day}{year}
\changedate{5}{1}{2009}

\today

\end{document}
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