\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[margin=18mm]{geometry}
\usepackage[reference-date=2026-07-18]{kanban-board}

\pagestyle{empty}

\newcommand{\deadlineboard}[1]{%
  \begin{kanban}[columns={Overdue,Due now,Upcoming},mode=#1]
    % deadline and due are aliases. The chip color is determined by status.
    \kanbantask[author=Alice,deadline=01/01/2000]
      {Overdue}{Resolve the review comments}
    \kanbantask[author=Bob,due=07/18/2026]
      {Due now}{Complete the current milestone}
    % ISO input is normalized to the selected display format.
    \kanbantask[author=Carol,deadline=2099-12-31]
      {Upcoming}{Prepare the next milestone}
  \end{kanban}}

\begin{document}

\section*{Deadline and due chips}

The red chip is a past calendar date, the amber chip is the configured
reference date,
and the neutral chip is a future calendar date. The same status colors are
retained on light and dark cards. The example uses US input and unambiguous
ISO input; both are normalized to the board's selected display format.

\subsection*{Light mode}
\deadlineboard{light}

\bigskip

\subsection*{Dark mode}
\deadlineboard{dark}

\end{document}