\newcommand{\signature}[1]{
    \addtocounter{@signdate}{1}
    \addtocounter{@signname}{1}
    \begin{center}
        \parbox{3cm}{
            \underline{\TextField[someOptions]{}}
            Datum
        }
        \hspace{0.5cm}
        \parbox{6cm}{
            \underline{\TextField[someOptions]{}}
            Vorname, Nachname 
        }
        \hspace{0.5cm}
        \parbox{6cm}{
            \vspace{2em}
            \rule{6cm}{1pt}\\
            Unterschrift #1
        }
    \end{center}
}

\begin{document}
    \signature{Person 1}
    \signature{Person 2}
\end{document}