\documentclass[a4paper,twoside]{article}
\usepackage{pdfbooklet}

\begin{document}
  \newcommand{\dateiso}{%
    \the\year-%
    \ifnum\the\month<10 0\fi\the\month-%
    \ifnum\the\day<10 0\fi\the\day
  }
  \makepdfbooklet{AddressBook-\dateiso}%
\end{document}
