当我引用参考书目中的条目（使用 style authoryear-comp）时，我希望使用旧式数字排版年份。我通过重新定义 bib 宏部分实现了我想要的功能，cite:labeldate+extradate但它并没有完全起作用（这让我怀疑我根本没有以正确的方式处理这个问题）。
例如，下面是一个 MWE：
\begin{filecontents}{\jobname.bib}
@article{Thor2009,
author = {Thor, Alice Ursula and Smith, John},
journal = {Some Journal},
number = {8},
pages = {123--456},
title = {A Very Important Paper},
volume = {79},
year = {2009}
}
@article{Thor2009b,
author = {Thor, Alice Ursula and Smith, John},
journal = {Some Different Journal},
number = {8},
pages = {123--456},
title = {Another Very Important Paper},
volume = {79},
year = {2009}
}
\end{filecontents}
\documentclass{article}
\usepackage[backend=biber,style=authoryear-comp]{biblatex}
\addbibresource{\jobname.bib}
% Style for years
\newcommand{\y}[1]{\oldstylenums{#1}}
\renewbibmacro*{cite:labeldate+extradate}{%
\iffieldundef{labelyear}
{}
{\printtext[bibhyperref]{\y{\printlabeldateextra}}}}
\begin{document}
Hello \textcite{Thor2009,Thor2009b}.
\printbibliography
\end{document}
当上面的内容排版时，引文包含字符串“(2009a,b)”。年份使用旧式数字排版，但是“a”（我认为）也以这种方式排版，使其看起来像是斜体，最后“,b”（正确）不受影响。我想要的是将年份（而不是其他内容）设置为旧式数字。
答案1
日期打印的代码biblatex有点……不寻常，分散在许多不同的地方。它发展了很多，不同的要求意味着它变得相当复杂。
问题中的方法的难点在于extradate标签也是由命令打印的\printlabeldateextra，因此\oldstylenums也适用于它。
最终，进行日期排版的代码存在于.lbx文件中。如果你想将所有年份改为旧式数字，你应该从那里下手。
不幸的是，该代码并不简短。
下面的代码取自english.lbx（第24-51行）。如果您正在使用其他语言，则需要对所使用的每种语言应用类似的重新定义。
\documentclass{article}
\usepackage[backend=biber,style=authoryear-comp]{biblatex}
\newcommand*{\bibyearformat}{\oldstylenums}
\DefineBibliographyExtras{english}{%
\protected\def\mkbibdatelong#1#2#3{%
\iffieldundef{#2}
{}
{\mkbibmonth{\thefield{#2}}%
\iffieldundef{#3}
{\iffieldundef{#1}{}{\space}}
{\nobreakspace}}%
\iffieldundef{#3}
{}
{\stripzeros{\thefield{#3}}%
\iffieldundef{#1}{}{,\space}}%
\iffieldbibstring{#1}
{\bibstring{\thefield{#1}}}
{\dateeraprintpre{#1}\bibyearformat{\stripzeros{\thefield{#1}}}}}%
\protected\def\mkbibdateshort#1#2#3{%
\iffieldundef{#2}
{}
{\mkmonthzeros{\thefield{#2}}%
\iffieldundef{#3}
{\iffieldundef{#1}{}{/}}
{/}}%
\iffieldundef{#3}
{}
{\mkdayzeros{\thefield{#3}}%
\iffieldundef{#1}{}{/}}%
\iffieldbibstring{#1}
{\bibstring{\thefield{#1}}}
{\dateeraprintpre{#1}\bibyearformat{\mkyearzeros{\thefield{#1}}}}}%
\protected\def\mkbibseasondateshort#1#2{%
\mkbibseason{\thefield{#2}}%
\iffieldundef{#1}{}{\space}%
\dateeraprintpre{#1}\bibyearformat{\mkyearzeros{\thefield{#1}}}}%
\protected\def\mkbibseasondatelong#1#2{%
\mkbibseason{\thefield{#2}}%
\iffieldundef{#1}{}{\space}%
\dateeraprintpre{#1}\bibyearformat{\mkyearzeros{\thefield{#1}}}}%
}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{Thor2009,
author = {Thor, Alice Ursula and Smith, John},
journal = {Some Journal},
number = {8},
pages = {123--456},
title = {A Very Important Paper},
volume = {79},
year = {2009},
}
@article{Thor2009b,
author = {Thor, Alice Ursula and Smith, John},
journal = {Some Different Journal},
number = {8},
pages = {123--456},
title = {Another Very Important Paper},
volume = {79},
year = {2009},
}
\end{filecontents}
\addbibresource{\jobname.bib}
\begin{document}
Hello \textcite{Thor2009,Thor2009b}.
\printbibliography
\end{document}
目前，代码只对年份应用旧式数字。月份和日期保持不变，人们可能也会将它们更改为旧式数字。
\newcommand*{\bibdatenumformat}{\oldstylenums}
\DefineBibliographyExtras{english}{%
\protected\def\mkbibdatelong#1#2#3{%
\iffieldundef{#2}
{}
{\mkbibmonth{\thefield{#2}}%
\iffieldundef{#3}
{\iffieldundef{#1}{}{\space}}
{\nobreakspace}}%
\iffieldundef{#3}
{}
{\bibdatenumformat{\stripzeros{\thefield{#3}}}%
\iffieldundef{#1}{}{,\space}}%
\iffieldbibstring{#1}
{\bibstring{\thefield{#1}}}
{\dateeraprintpre{#1}\bibdatenumformat{\stripzeros{\thefield{#1}}}}}%
\protected\def\mkbibdateshort#1#2#3{%
\iffieldundef{#2}
{}
{\bibdatenumformat{\mkmonthzeros{\thefield{#2}}}%
\iffieldundef{#3}
{\iffieldundef{#1}{}{/}}
{/}}%
\iffieldundef{#3}
{}
{\bibdatenumformat{\mkdayzeros{\thefield{#3}}}%
\iffieldundef{#1}{}{/}}%
\iffieldbibstring{#1}
{\bibstring{\thefield{#1}}}
{\dateeraprintpre{#1}\bibdatenumformat{\mkyearzeros{\thefield{#1}}}}}%
\protected\def\mkbibseasondateshort#1#2{%
\mkbibseason{\thefield{#2}}%
\iffieldundef{#1}{}{\space}%
\dateeraprintpre{#1}\bibdatenumformat{\mkyearzeros{\thefield{#1}}}}%
\protected\def\mkbibseasondatelong#1#2{%
\mkbibseason{\thefield{#2}}%
\iffieldundef{#1}{}{\space}%
\dateeraprintpre{#1}\bibdatenumformat{\mkyearzeros{\thefield{#1}}}}%
}
答案2
\DeclareFieldFormat{oldstyle}{\oldstylenums{#1}}
\renewbibmacro*{cite:labeldate+extradate}{%
\iffieldundef{labelyear}
{}
{\printtext[oldstyle]{\printlabeldateextra}}}
或者，如果你需要hyperref
\DeclareFieldFormat{oldstyle}{\bibhyperref{\oldstylenums{#1}}}
答案3
date您应该通过例如调整字段格式等
\DeclareFieldFormat{date}{\oldstylenums{#1}}
文档中说，对各个字段的字体进行更改属于此处biblatex。不幸的是，要正确设置多个字段。如果遗漏了一些，请告诉我。
\begin{filecontents}{\jobname.bib}
@article{Thor2009,
author = {Thor, Alice Ursula and Smith, John},
journal = {Some Journal},
number = {8},
pages = {123--456},
title = {A Very Important Paper},
volume = {79},
year = {2009}
}
@article{Thor2009b,
author = {Thor, Alice Ursula and Smith, John},
journal = {Some Different Journal},
number = {8},
pages = {123--456},
title = {Another Very Important Paper},
volume = {79},
year = {2009}
}
\end{filecontents}
\documentclass{article}
\usepackage[backend=biber,style=authoryear-comp]{biblatex}
\addbibresource{\jobname.bib}
\DeclareFieldFormat{date}{\oldstylenums{#1}}
\DeclareFieldFormat{dateextra}{\oldstylenums{#1}}
\DeclareFieldFormat{extradate}{\oldstylenums{\mknumalph{#1}}}
\DeclareFieldFormat{labeldate}{\oldstylenums{#1}}
\DeclareFieldFormat{labeldateextra}{\oldstylenums{#1}}
\begin{document}
Hello \textcite{Thor2009,Thor2009b}.
\printbibliography
\end{document}