some changes in biblatex authoryear style

Question

It took me nearly this entire day to figure out natbib might not be the way to go for my masters thesis. So now I finally switched to Biblatex. However there are still some things I can't figure out. I produce my bibfile with citavi.

• I got the editor displayed as 'Hrsg. von {editor}' and want to change that to 'Hrsg.: {editor}' for @book and @booklets
• Is there a way of printing URLDATESs for internet references (@booklets)? desired output would be : {author} ({year}). {title}. Hrsg.: {editor}. {url}. last accessed: {urldate}

this is my code:

\documentclass{scrreprt}

\usepackage[style=authoryear, 
            natbib=true, 
            backend=biber, 
            maxcitenames=2,
            maxbibnames=9,
            uniquelist=false]{biblatex}
\addbibresource{Literatur_Citavi.bib} 
\usepackage{csquotes}
\usepackage[ngerman]{babel}     % German
\setlength\bibitemsep{.5\baselineskip}

% et al instead u.a.
\DefineBibliographyStrings{ngerman}{
   andothers = {{et\,al\adddot}},            
}

% Lastname, F.
\DeclareNameFormat{sortname}{%
   \usebibmacro{name:family-given}
   {\namepartfamily}
   {\namepartgiveni}
   {\namepartprefix}
   {\namepartsuffix}%
}%


% Comma between Journal and Volume
\renewbibmacro*{journal+issuetitle}{%
   \usebibmacro{journal}%
   \setunit*{\addcomma\addspace}%<--da
   \iffieldundef{series}
   {}
   {\newunit
      \printfield{series}%
      \setunit{\addspace}}%
   \usebibmacro{volume+number+eid}%
   \setunit{\addspace}%
   \usebibmacro{issue+date}%
   \setunit{\addcolon\space}%
   \usebibmacro{issue}%
   \newunit}




\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@booklet{copeland.,
 abstract = {Artificial intelligence, the ability of a computer or computer-controlled robot to perform tasks commonly associated with intelligent beings. The term is frequently applied to the project of developing systems with the ability to reason, discover meaning, generalize, or learn from past experiences.},
 author = {Copeland, B. J.},
 editor = {{Encyclopaedia Britannia}, Inc.},
 year = {2019},
 title = {Artificial Intelligence},
 howpublished = {\url{https://www.britannica.com/technology/artificial-intelligence}},
 urldate = {26.07.2019}
}


\end{filecontents}

\addbibresource{\jobname.bib}

\begin{document}


\printbibliography

\end{document}

How do I change the display of the editor field for @books and @booklets in general into 'Hrsg.: {editor}'?

Answer 1

To change ‘Hrsg. von’ to ‘Hrsg.:’ you need to redefine the byeditor string.

The urldate is not appearing because you have used the wrong format. Date fields in biblatex need to be in the format yyyy-mm-dd. The output format is taken care of by localisation settings. The format of the urldate defaults to:

\DeclareFieldFormat{urldate}{\mkbibparens{\bibstring{urlseen}\space#1}}

So you could redefine this and/or redefine the urlseen string to match what you want.

And you probably want editor = {{Encyclopaedia Britannia, Inc.}} instead of editor = {{Encyclopaedia Britannia}, Inc.} to avoid ‘Inc.‘ being treated as a family name.

MWE

\documentclass{scrreprt}

\usepackage[style=authoryear, 
            natbib=true, 
            backend=biber, 
            maxcitenames=2,
            maxbibnames=9,
            uniquelist=false]{biblatex}
\usepackage{csquotes}
\usepackage[ngerman]{babel}     % German
\setlength\bibitemsep{.5\baselineskip}

% et al instead u.a.
\DefineBibliographyStrings{ngerman}{%
   andothers = {et\,al\adddot},
   byeditor  = {Hrsg\adddot\addcolon},
}

% Lastname, F.
\DeclareNameFormat{sortname}{%
   \usebibmacro{name:family-given}
   {\namepartfamily}
   {\namepartgiveni}
   {\namepartprefix}
   {\namepartsuffix}%
}%


% Comma between Journal and Volume
\renewbibmacro*{journal+issuetitle}{%
   \usebibmacro{journal}%
   \setunit*{\addcomma\addspace}%<--da
   \iffieldundef{series}
   {}
   {\newunit
      \printfield{series}%
      \setunit{\addspace}}%
   \usebibmacro{volume+number+eid}%
   \setunit{\addspace}%
   \usebibmacro{issue+date}%
   \setunit{\addcolon\space}%
   \usebibmacro{issue}%
   \newunit}




\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@booklet{copeland.,
 abstract = {Artificial intelligence, the ability of a computer or computer-controlled robot to perform tasks commonly associated with intelligent beings. The term is frequently applied to the project of developing systems with the ability to reason, discover meaning, generalize, or learn from past experiences.},
 author = {Copeland, B. J.},
 editor = {{Encyclopaedia Britannia, Inc.}},
 year = {2019},
 title = {Artificial Intelligence},
 howpublished = {\url{https://www.britannica.com/technology/artificial-intelligence}},
 urldate = {2019-07-26}
}


\end{filecontents}

\addbibresource{\jobname.bib}

\begin{document}
\nocite{*}

\printbibliography

\end{document}

For what it's worth, I'd set your bib entries up like this:

@online{copeland2019,
  author = {Copeland, B. J.},
  title = {Artificial intelligence},
  eprinttype = {Encyclopædia Britannica},
  date = {2019-05-09},
  eprint = {https://www.britannica.com/technology/artificial-intelligence},
  urldate = {2019-08-29}
}
@online{aunkofer2019,
  author = {Aunkofer, Benjamin},
  title = {Machine Learning vs Deep Learning},
  subtitle = {Wo liegt der Unterschied?},
  eprinttype = {Data Science Blog},
  date = {2018-05-14},
  eprint = {https://data-science-blog.com/blog/2018/05/14/machine-learning-vs-deep-learning-wo-liegt-der-unterschied/},
  urldate = {2019-08-29}
}