% This file is public domain.

% This document requires the datetime2-english module to be
% installed (in addition to the datetime2 package).
% arara: pdflatex
\documentclass[british,american,australian,canadian,newzealand,en-GG,en-JE,en-IM,en-MT,en-IE]{article}

\usepackage{babel}
\usepackage[datesep=/,showzoneminutes=false,useregional]{datetime2}
\usepackage[colorlinks]{hyperref}

%\DTMlangsetup{mapzone=false}

\DTMsavetimestamp{mydate}{2014-06-03T12:45:02+01:00}
\DTMsavetimestamp{mydate2}{2015-03-20T08:05:09+00:00}
\DTMsavetimestamp{mydate3}{2014-12-15T23:55:49-06:00}
\DTMsavetimestamp{mydate4}{2014-01-27T12:05:00+09:00}
\DTMsavetimestamp{mydate5}{2013-11-28T02:05:00+12:00}

% This will clear the BST mapping when the regional styles are set.
% The en-GB (british) style will then set it to BST.
\renewcommand*{\DTMresetzones}{\DTMclearmap{01}{00}}

\begin{document}
\tableofcontents

% Define command to test each region
\newcommand{\testregion}[1]{%
  \ifcsdef{date#1}{\selectlanguage{#1}}{\DTMsetstyle{#1}}%

  \section{#1}

  Today: \today.

  Now: \DTMnow.

  \subsection{\DTMuse{mydate}}
  Saved Date (\texttt{mydate}): \DTMusedate{mydate}
  Saved time (\texttt{mydate}): \DTMusetime{mydate}.
  \typeout{Date (#1): \DTMusedate{mydate}}

  \subsection{\DTMuse{mydate2}}
  Saved Date (\texttt{mydate2}): \DTMusedate{mydate2}
  Saved time (\texttt{mydate2}): \DTMusetime{mydate2}.
  \typeout{Date (#1): \DTMusedate{mydate2}}

  \subsection{\DTMuse{mydate3}}
  Saved Date (\texttt{mydate3}): \DTMusedate{mydate3}
  Saved time (\texttt{mydate3}): \DTMusetime{mydate3}.
  \typeout{Date (#1): \DTMusedate{mydate3}}

  \subsection{\DTMuse{mydate4}}
  Saved Date (\texttt{mydate4}): \DTMusedate{mydate4}
  Saved time (\texttt{mydate4}): \DTMusetime{mydate4}.
  \typeout{Date (#1): \DTMusedate{mydate4}}

  \subsection{\DTMuse{mydate5}}
  Saved Date (\texttt{mydate5}): \DTMusedate{mydate5}
  Saved time (\texttt{mydate5}): \DTMusetime{mydate5}.
  \typeout{Date (#1): \DTMusedate{mydate5}}
}

\testregion{british}

\testregion{american}

\testregion{australian}

\testregion{canadian}

\testregion{newzealand}

% no official babel language for these regions as far as I can tell:
\testregion{en-GG}

\testregion{en-JE}

\testregion{en-IM}

\testregion{en-MT}

\testregion{en-IE}

\end{document}