LaTeX Forum

\documentclass{scrbook}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc} 
\usepackage{isodate}
\usepackage[ngerman]{babel}

\title{Über Balkonpflanzen im Winter}
\author{Prof. Dr. van Dusen}
\date{\printdayoff\today} % Hier hackt es

\begin{document}
\maketitle
\end{document}

\documentclass[ngerman]{scrbook} 

\usepackage[latin1]{inputenc} 
\usepackage[T1]{fontenc} 
\usepackage[ngerman]{babel} 
\usepackage{isodate} 


\title{Über Balkonpflanzen im Winter} 
\author{Prof. Dr. van Dusen} 
\date{\printdayoff\today} % Hier hackt es 

\begin{document} 
\maketitle 
\end{document}

./untitled.tex:15: Undefined control sequence.
\@date ->\printdayoff 
                      \today 
l.15 \end
         {document}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

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