I'm trying to fix the layout of the font page of my Master Thesis. As you can see in the uploaded image the date is not put at the bottom of the page.

I've tried to move it down with the \vspace or \vfill commands, but the result was either no movement, or moving it to next page.
Is there some instruction for putting it at the very bottom of page?And what are the commands for doing it if I tried to set the absolute positioning of the text?
Note that I put the date with sample text and not by using the \date command and make title one. This is the code for the front page:
\documentclass[12pt,oneside,a4paper]{book}
\usepackage{graphicx}
\usepackage{setspace}
\begin{document}
\frontmatter
\begin{titlepage}
\begin{figure}[t]
\centering
\includegraphics[scale=0.35]{./images/Logo_Unisi_2012.jpg}
\end{figure}
\begin{center}
{\large UNIVERSITY OF SIENA} \medskip \\
{\large DEPARTMENT OF ENGINEERING} \vspace*{0.5cm} \\
{\Large Master Thesis in Computer Science Engineering} \vspace*{2.0cm} \\
\doublespacing
{\huge \textbf{This is the long title of my Master thesis}} \vspace*{2.3cm}
\end{center}
\begin{minipage}[t]{0.5\textwidth}
\begin{flushleft}
{\large \textit{Author}:\vspace*{0.5cm} \\ Me
}
\end{flushleft}
\end{minipage}%
%
\begin{minipage}[t]{0.5\textwidth}
\begin{flushright}
{\large \textit{Supervisor}:\vspace*{0.5cm} \\ Him \\
}
\vspace*{0.5cm}
{\large \textit{Advisors}:\vspace*{0.5cm}\\First\vspace*{0.1cm}\\Second\vspace*{0.1cm}\\Third\\
}
\end{flushright}
\end{minipage}%
\begin{center}
\begin{minipage}[b]{0.5\textwidth}
\vfill
\begin{center}
{\large 10 December 2012}
\end{center}
\begin{center}
{\large Academic Year 2011/2012}
\end{center}
\end{minipage}%
\end{center}
\thispagestyle{empty}
\end{titlepage}
\end{document}

\vspace{0.3cm}inside to\begin{minipage}– karathan Nov 29 '12 at 10:34\vspaceor\vspace*or\vfill– Matteo Nov 29 '12 at 10:38\documentclassand the appropriate packages so that those trying to help don't have to recreate it. – Peter Grill Nov 29 '12 at 10:40\documentclass{...}and\usepackage{...}– karathan Nov 29 '12 at 10:52\documentclass[12pt]{article} \usepackage{tikz} \begin{document} \tikz[remember picture,overlay] \draw (current page.south) + (0,2) node {10 December, 2012}; \end{document}(requires two compilations). – Nov 29 '12 at 10:55centerenvironment where you specifyUNIVERSITY OF SIENA, does the problem still occur. If so, take it out as that is not needed to reproduce the problem. But the MWE should start with\documentclassand end withend{document}. – Peter Grill Nov 29 '12 at 11:00geometrypackage to adjust the margin of title page. Use\newgeometry{bottom=1cm}to change bottom margin to 1cm, add\vfillto move the date to bottom and then\restoregeometryto revert back to normal margins. Another option would be to set the date in footer and have a separate footer style for title page. – mythealias Nov 29 '12 at 11:14! Undefined control sequence \newgeometry, are these the correct names of commands and package?thks for help – Matteo Nov 29 '12 at 11:20