How can I remove the blank space in urldate (while using ngerman and biblatex)?

Question

I want the urldate like the other dates. DeclareFieldFormat{urldate} seems not obviously be of help. Perhaps someone has an idea
Here is an MWE
documentclass[10pt,a4paper]{article}
usepackage[utf8]{inputenc}
usepackage[ngerman]{babel}
usepackage[natbib=true,backend=biber,style=authoryear]{biblatex}

addbibresource{biblatex-examples.bib}
    
    begin{document}
    
   My Birthday: 01.01.1900    
   
    autocite{ctan}

printbibliography    
    
    end{document}

moewe · Accepted Answer

You can remove the spaces by removing the thinspaces from the relevant localisation macro mkbibdateshort. Its original definition can be found in german.lbx (ll. 28-41) in v3.16
documentclass[10pt,a4paper]{article}
usepackage[utf8]{inputenc}
usepackage[ngerman]{babel}
usepackage[natbib=true,backend=biber,style=authoryear]{biblatex}

makeatletter
DefineBibliographyExtras{german}{%
  protecteddefmkbibdateshort#1#2#3{%
    iffieldundef{#3}
      {}
      {mkdayzeros{thefield{#3}}adddot}%
    iffieldundef{#2}
      {}
      {mkmonthzeros{thefield{#2}}%
       iffieldundef{#1}
         {}
         {iffieldundef{#3}{/}{adddot}}}%
    iffieldbibstring{#1}
      {bibstring{thefield{#1}}}
      {dateeraprintpre{#1}mkyearzeros{thefield{#1}}}}%
}
makeatother

addbibresource{biblatex-examples.bib}
    
begin{document}
  My Birthday: 01.01.1900

autocite{ctan}

printbibliography
end{document}

See also https://github.com/plk/biblatex/issues/891

How can I remove the blank space in urldate (while using ngerman and biblatex)?

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