\listfiles{}

\documentclass[UKenglish,english,USenglish,american,canadian,australian,newzealand,british]{article}
\usepackage{babel}
\usepackage{datetime}
\newcommand{\displayeddate}[1]{%
  \selectlanguage{#1}
  \today: today in #1.\par
}
\begin{document}
\displayeddate{british}
\displayeddate{UKenglish}
\displayeddate{english}
\displayeddate{USenglish}
\displayeddate{american}
\displayeddate{canadian}
\displayeddate{australian}
\displayeddate{newzealand}
\end{document}
