% arara: xelatex
\documentclass{article}

\usepackage[other={pt-BR,de-CH-1996,fr-BE},timedata]{tex-locale}

\setmainfont{STIX}

\newcount\tmpctr

\newcommand{\test}{%
  \section{Document language \languagename\space
  (\CurrentTrackedLanguageTag)}
  \subsection{datetime2 commands}
  \texttt{\string\today}: \today.
  \texttt{\string\DTMcurrenttime}: \DTMcurrenttime.
  \subsection{Locale Details}
  Language: \CurrentLocaleLanguageNativeName.
  Region: \CurrentLocaleRegionNativeName.
  \subsection{Dates and Times (Obtained from Java)}
  Today: \CurrentLocaleDate.
  Time: \CurrentLocaleTime.
  First day of the week: 
   \CurrentLocaleStandaloneDayName{\CurrentLocaleFirstDayIndex}
   (index: \CurrentLocaleFirstDayIndex).
  Current month:
   \CurrentLocaleStandaloneMonthName{\month}.
  \par
  Days of the week:%
  \tmpctr=1\relax
  \loop
    \space
    \CurrentLocaleStandaloneDayName
     {\CurrentLocaleDayIndexFromRegion{\tmpctr}}%
    \advance\tmpctr by 1
  \ifnum\tmpctr<8
  \repeat
  .
  \par
  Full date-time pattern:
  \texttt{\LocaleGetDialectAttribute{\CurrentTrackedDialect}{fulldatetimefmt}}
  \par
  Apply full date-time pattern:
  \CurrentLocaleApplyDateTimePattern{fulldatetimefmt}{\LocaleDateTimeInfo}
  \subsection{Numeric}
  Numeric symbols: 
   \CurrentLocaleNumericGroupSep\ (group separator)
   \CurrentLocaleDecimalSep\ (decimal separator)
   \CurrentLocaleMonetarySep\ (monetary separator)
   \CurrentLocaleExponent\ (exponent)
   \CurrentLocalePercent\ (percent)
   \CurrentLocalePermill\ (per mill).
  \par
  Uses numeric group separator:
   \CurrentLocaleIfNumericUsesGroup{yes}{no}.
  \par
  Currency symbol: \CurrentLocaleCurrency
  \par
  Integer:
  \texosqueryfmtnumber{\CurrentLocaleIntegerPattern}{123456}{0}{0}
  \par
  Decimal:
  \texosqueryfmtnumber{\CurrentLocaleDecimalPattern}{123456}{78}{0}
  \par
  Percentage:
  \texosqueryfmtnumber{\CurrentLocalePercentPattern}{0}{65}{0}
  \par
  Currency:
  \texosqueryfmtnumber{\CurrentLocaleCurrencyPattern}{1234567}{0}{0}
}

\renewcommand*{\localedatetimefmt}[1]{\localenopolypunct{#1}}

\begin{document}
\section{General Information}

OS name: \LocaleOSname.
OS version: \LocaleOSversion.
OS arch: \LocaleOSarch.

Default file encoding: \LocaleOScodeset.

The PDF file was last built: \texttt{\LocaleNowStamp}.

The source file was last modified: \texttt{\LocaleFileMod}.

Main locale: \LocaleMain\ (\LocaleMainDialect).

Other locales: \LocaleOther.

\ForEachTrackedLanguage{\thislanguage}
{%
  \selectlanguage{\thislanguage}
  \test
}

\end{document}