Biblatex – Altering Date Format in References

Question

I am still working on formatting my references according to my department’s standard. I am currently trying to alter a date format but failing.

I need:

30. Sept. 2003.

Yet anything I do doesn’t seem to have any influence. Find attached a MWE:

\documentclass[a4paper,12pt]{article}
\usepackage{xpatch}
\usepackage{polyglossia}
\setmainlanguage[variant=british]{english}
\usepackage{fontspec,xltxtra,xunicode}
\usepackage{csquotes}
\usepackage{url}
\usepackage[style=authoryear-ibid,backend=biber,doi=false,isbn=false,url=false,autolang=hyphen]{biblatex}
     \addbibresource{Merkliste.bib}
     \renewcommand*{\postnotedelim}{\addcolon\space}
     \renewbibmacro{in:}{\ifentrytype{article}{}{\printtext{\bibstring{in}\intitlepunct}}}
    \renewcommand*{\intitlepunct}{\addspace}
     \renewcommand{\bibpagespunct}{\ifentrytype{incollection}{\addperiod\addspace}{\addcolon\addspace}}

\DeclareFieldFormat
  [online]
  {url}{{#1}}
\DeclareFieldFormat
  [online]
  {title}{\mkbibquote{#1\isdot}}
\xpatchbibmacro{title}{\printfield[titlecase]{subtitle}}%
{\printfield[titlecase]{subtitle}\ifentrytype{online}{\addperiod}{}}%
{}{}%
\DeclareFieldFormat{urldate}{#1}
\DeclareFieldFormat{postnote}{#1}
\DeclareFieldFormat{multipostnote}{#1}
\DeclareFieldFormat{pages}{#1}
%% Here are my tries.
\xpatchbibmacro{url+urldate}{\printfield{urlyear}\mkbibmonth{\thefield{urlmonth}}{\thefield{urlday}}}{}{}
    \xpatchbibmacro{date+extrayear}{%
  \printtext[parens]%
}{%
  \setunit*{\addperiod\space}%
  \printtext%
}{}{}

\xpatchbibmacro{title}{\printfield[titlecase]{subtitle}}%
{\printfield[titlecase]{subtitle}\ifentrytype{article}{\addperiod}{}}%
{}{}%

\AtEveryBibitem{\clearlist{language}} % clears language
\AtEveryBibitem{\clearfield{note}}    % clears notes
\AtEveryBibitem{\clearfield{series}}   % clears Series
\AtEveryBibitem{\ifentrytype{book}{\clearfield{number}}{}}
\AtEveryBibitem{\ifentrytype{book}{\clearfield{pages}}{}}

\begin{document}
\nocite{*}. 
\printbibliography
\end{document}

and a .bib-extract:

![@online{secretariat_a_la_politique_linguistique_quebec_dynamique_2014,
    Author = {{Secr{\'e}tariat {\`a} la politique linguistique Qu{\'e}bec}},
    Date-Modified = {2014-08-03 17:01:54 +0000},
    File = {Dynamique des langues en quelques chiffres \: Tableaux - Secr{\'e}tariat {\`a} la politique linguistique.pdf:/Users/Moritz/Desktop/Dynamique des langues en quelques chiffres \: Tableaux - Secr{\'e}tariat {\`a} la politique linguistique.pdf:application/pdf},
    Month = jul,
    Title = {La dynamique des langues en quelques chiffres : Tableaux},
    Urldate = {2014-07-28},
    Year = {2014}}][1]

Answer 1

Biblatex offers different options to format a date. If the format is not a predefined one, it is possible to use \DeclareFieldFormat to provide a now format, in this case we can provide a format for urldate

\DeclareFieldFormat{urldate}{%
  \thefield{urlday}\adddot\addspace%
  \mkbibmonth{\thefield{urlmonth}}\adddot\addspace%
  \thefield{urlyear}\isdot}

To use the abbreviated version for the month one can use the dateabbrev option of biblatex.