像这样吗?
\documentclass{article}
\usepackage{datetime}
\usepackage{eso-pic}
\usepackage{lipsum}
\begin{document}
\newdateformat{myday}{%
\twodigit{\THEDAY}}
\settimeformat{hhmmsstime}
\AddToShipoutPicture{%
\AtTextLowerLeft{%
\put(290,-20){\myday\today--\currenttime}%
}%
}
\lipsum[1-10]
\end{document}
