Adding the date of adding todo-note

Question

As is -I suspect- usual is that while writing documents sometimes one skips writing certain parts for a cornucopia of reasons. For me that is usually because I am too lazy at the moment. In an case, then I have the following command to make a todo-note (can look better, I know):

\newcommand{\todo}[1]{ \vspace{5 mm} \par
\noindent \framebox{
\begin{minipage}
[c]{0.94 \textwidth}
\tt #1 \flushright  TODO
\end{minipage}
}
\vspace{5 mm} \par
}

I have obtained this some time ago from here. My question is how I add the date of adding the todo-note? One can assume that at least I compile the file on the same day as I added the todo-note, so to me, this sounds like the LaTeX process should store this in an auxiliary file (preferable one that already exists). How do I do this?