Customise extrayear label - TeX

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Customise extrayear label

biblatex add tag

निरंजन

Look at the following MWE -

```
\documentclass{article}
\usepackage[backend=biber, style=authoryear]{biblatex}
\begin{filecontents}[overwrite]{\jobname.bib}
@article{test1,
  title         =  {Test article},
  author        =  {Tambe, Niranjan Vikas},
  date          =  {2021-01},
  journaltitle  =  {TopAnswers},
  series        =  {1}
}
@article{test2,
  title         =  {Test article 2},
  author        =  {Tambe, Niranjan Vikas},
  date          =  {2021-02},
  journaltitle  =  {TopAnswers},
  series        =  {2}
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
\cite{test1}

\cite{test2}

\printbibliography
\end{document}
```

In the output we see -

![Screenshot_2021-01-17_11-43-01.png](/image?hash=ef7b1a5e8f83d345e25c7ce5f2891190d0bc5ff6d871fdcc2da4e74d8bc1e7c2)

Instead of `2021a` and `2021b` if I want something else (e.g. `2021-x` & `2021-y`) is it possible to get it with some `renewcommand`s? Also is it possible to provide a list of strings (i.e. `w x y z`) for chronologically adding them after the redundant year? (e.g. `2021-w` > `2021-x` > `2021-y` > `2021-z`)

Top Answer

samcarter

Here is something to change the first three labels for the extrayear. You can add more if-clauses if you need more.

```
\documentclass{article}
\usepackage[backend=biber, style=authoryear]{biblatex}
\begin{filecontents*}[overwrite]{\jobname.bib}
@article{test1,
  title         =  {Test article},
  author        =  {Tambe, Niranjan Vikas},
  date          =  {2021-01},
  journaltitle  =  {TopAnswers},
  series        =  {1}
}
@article{test2,
  title         =  {Test article 2},
  author        =  {Tambe, Niranjan Vikas},
  date          =  {2021-02},
  journaltitle  =  {TopAnswers},
  series        =  {2}
}
\end{filecontents*}
\addbibresource{\jobname.bib}

\DeclareFieldFormat{extradate}{%
  \iffieldnums{labelyear}
    {%
      \ifnum#1=1
        x%
      \else
        \ifnum#1=2
          y%
        \else
          \ifnum#1=3
            z%
          \else
            \mknumalph{#1}%
          \fi%
        \fi%
      \fi%
      }
    {\mkbibparens{\mknumalph{#1}}}}
\begin{document}
\cite{test1}

\cite{test2}

\printbibliography
\end{document}
```
![Screen Shot 2021-01-17 at 15.05.36.png](/image?hash=f57b4ab95c608860d02c14eaabf7c9cb075ffd16213ed295599186a4b4f2b9ac)

1 Answer