% arara: pdflatex: {shell: on}
\documentclass[nswissgerman]{article}

\usepackage[main={locale},other={pt-BR,fr-BE},date=full,time=full,timedata]{tex-locale}

\newcommand{\test}{%
  \section{Document language \languagename\space
  (\CurrentTrackedLanguageTag)}
  \texttt{\string\today}: \today.
  \texttt{\string\DTMcurrenttime}: \DTMcurrenttime.
  (Obtained from \texttt{datetime2} package.)
  \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}.
  Current month:
   \CurrentLocaleStandaloneMonthName{\month}.
  \par
  Date pattern: 
  \texttt{\LocaleGetDialectAttribute{\CurrentTrackedDialect}{fulldatefmt}}.
  \par
  Apply pattern:
  \CurrentLocaleApplyDateTimePattern{fulldatefmt}{\LocaleDateTimeInfo}.
  \par
  Time pattern: 
  \texttt{\LocaleGetDialectAttribute{\CurrentTrackedDialect}{fulltimefmt}}.
  \par
  Apply pattern:
  \CurrentLocaleApplyDateTimePattern{fulltimefmt}{\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}\par
}

\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.

\test

\selectlocale{de-CH-1996}
\test

\selectlocale{fr-BE}
\test

\selectlocale{pt-BR}
\test

\end{document}