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%%  Ein Beispiel der DANTE-Edition
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%%  1. Auflage
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%%  Copyright (C) 2014 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{169.16928pt}
\setlength\parindent{0pt}
\usepackage{fontspec}
\begin{document}
Die aktuelle Uhrzeit ist \bgroup\catcode`\%=12
\directlua{tex.print(os.date("%H:%M:%S"))}
\egroup
\end{document}