Maithili
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This page offers basic guidance on typesetting a LaTeX document in the Maithili language using the Devanagari script.
Support with ini locale file
Here is a minimal sample file with maithili as the main language
(assuming luatex, which is the recommended engine, and babel ≥25.14,
although it may work with previous versions).
\documentclass[maithili]{article}
\usepackage{babel}
\babelfont{rm}{Shobhika}
\begin{document}
Local name $=$ मैथिली
Today $=$ \today
Digits $=$ \localenumeral{digits}{0123456789}
\end{document}

Calendar
The Indian National Calendar, named indian, is supported (luatex and
xetex). Here is an example setting indian as the default
calendar for \today.
\documentclass{article}
% Set a fixed day for this example
\year=2026 \month=8 \day=15
\usepackage[maithili, provide={calendar=indian}]{babel}
\babelfont{rm}{Shobhika}
\begin{document}
\today
\end{document}
Contribute
If you are a native speaker or have expertise in this language, you can contribute, make suggestion or request an enhancement by submitting a pull request, opening an issue, or contacting the Babel maintainer with the link above.