Thanks to duodecimal page number I don't have to ask how to get duodecimal page numbers and I managed to get duodecimal chapter numbers with that method too. But how do I change the sections, subsections, … to be also shown in duodecimal values?

  { \duodec_convert:n { #1 } }

\tl_new:N \l_duodec_string_tl
\cs_new_protected:Npn \duodec_convert:n #1
   \tl_set:Nx \l_duodec_string_tl { \int_to_base:nn { #1 } { 12 } }
   \tl_replace_all:Nnn \l_duodec_string_tl { a } { ↊ } %I use XeLaTex, so these sings are no problem at all ;)
   \tl_replace_all:Nnn \l_duodec_string_tl { b } { ↋ }
   \tl_use:N \l_duodec_string_tl


This leads to sections numbered without the chapter number (1,2,3 instead of 5.1,5.2,5.3...). How do I get the standard numbering just with duodecimal values? I tried it with


to maintain parenting but with no results.

To be clear, I want all automatic numbering (pages, chapters etc, pictures, tables…) to be in duodecimal values in the end, without changing the format. Thank you!

  • 3
    \renewcommand{\thesection}{\thechapter.\basetwelve{\arabic{section}}} Dec 23, 2018 at 9:51
  • Wow! That was too easy, thank you! I kind of tried the same but because the "." turned blue like it combined with \thechapter, I inserted a space (\thechapter .) which seemed to corrupt everything and a huge load of errors appeared. Now that I deleted the space it works! Thanks a lot!!!
    – DonMeles
    Dec 23, 2018 at 10:56
  • \thechapter. and \thechapter . are identical input to TeX (the space is not tokenised so the definitions would be identical whether or not there is a space, not just act the same way Dec 23, 2018 at 11:09
  • Per haps for future readers - For the sub- and subsubsection it is NOT \renewcommand{\thesubsection}{\thechapter.\thesection.\basetwelve{\arabic{subsection}}} But just \renewcommand{\thesubsection}{\thesection.\basetwelve{\arabic{subsection}}} otherwise the number of the chapter will appear twice because it is in the section AND subsectioncode wich results in a very long and redundant numbering xD
    – DonMeles
    Dec 23, 2018 at 11:10
  • 1
    feel free to post a full working answer:-) Dec 23, 2018 at 11:11

1 Answer 1


Thank you, David, for your Help! The solution is way easier than I thought.

To get the solution I was looking for you need the following code:

\usepackage{graphicx} % I need this to rotate my numbers...
\usepackage{xparse} % this is the magic package...
\ExplSyntaxOn % for the missing numbers after 9 the package uses "a" and "b",
              % but I want to use "↊" and "↋" as defined by the Dozenal
              % Society of Great Britain. The following lines do that for me:

  { \duodec_convert:n { #1 } }

\tl_new:N \l_duodec_string_tl
\cs_new_protected:Npn \duodec_convert:n #1
   \tl_set:Nx \l_duodec_string_tl { \int_to_base:nn { #1 } { 12 } }
   \tl_replace_all:Nnn \l_duodec_string_tl { a } { \rotatebox[origin=c]{180}{2} }
    % I rotate the numbers, because standard fonts don't contain ↊ and ↋.
   \tl_replace_all:Nnn \l_duodec_string_tl { b } { \rotatebox[origin=c]{180}{3} }
   \tl_use:N \l_duodec_string_tl
\ExplSyntaxOff % I got this code from the related question linked above.

 % No problems so far...
 % This is how you get numbering formatted as chapter.section:
 % Dont put \thechapter here, it is already contained in \thesection!!!
 % As I told you, I wanted to change the figcaptions too. 
 % But I don't need the chapter's number here.
 % And this is my first dozenal enumeration with a dot behind the number.

 %let's see, if it works:
\part{Quick demonstration}
\chapter{Here we go!}
Just scroll down...
Whoops, nearly there...
On this and on the following page you see the dozenal page numbers!
See? It works!
This is the dozenal number  \rotatebox[origin=c]{180}{2}, equal to $ 10_{(10)} $.
This is the second dozenal number: \rotatebox[origin=c]{180}{3}, it is just a turned 3 and equal to $ 11_{(10)} $.
\section{What are these symbols?!}
I use fonts like Times New Roman, they have symbols like \rotatebox[origin=c]{180}{2} and \rotatebox[origin=c]{180}{3} integrated as Unicode glyphs U+218A and U+218B. They are just rotated numbers too, basicly. These numbers are defined by the Dozenal Society of Great Britain and I like them. If you complie with XeLaTeX you can just copy and paste these signs: ↊ and ↋ (in this font they will probably be invisible).

\section{Why so many chapters?}
I need more than 12 pages and chapters for the numbers  \rotatebox[origin=c]{180}{2} and \rotatebox[origin=c]{180}{3} to appear.

\item Just
\item a
\item very
\item short
\item demonstration
\item of
\item a
\item dozenal
\item enumeration
\item for
\item you
\item to
\item admire.
\section{Just a random section}
\subsection{with a subsection}
\subsubsection{and a subsubsection}
These all work just finde with dozenal numbers aswell but I think the code is already long enough. And as you see, subsubsections usually don't have numbers at all.

Now my entire document uses the duodecimal system and I feel like it's already Christmas. Thanks!!!


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