Table of Contents not dynamically updating

Question

This is the code I am using (along with the datenumber package) to create subsection titles that include an increasing date.

\DeclareRobustCommand\mysubsectiontitle{Week of \StrLeft{\datemonthname}{3}. \thedateday, \thedateyear}
\newcommand{\mysubsection}[1]{\subsection{\mysubsectiontitle #1}}

The section titles do increase, but the table of contents display the same date across.

Subsections:

TOC:

I am also getting a lot of warnings in the form "Token not allowed in a PDF string (Unicode)."

How can I fix this?

EDIT:

\documentclass[12pt]{article}

\usepackage{xstring}
\usepackage{datenumber}
\setdatenumber{2024}{02}{26}

\newcommand{\mysectiontitle}{\datemonthname~\thedateyear}
\newcommand{\mysection}[1]{\section{\mysectiontitle #1}}

\DeclareRobustCommand\mysubsectiontitle{Week of \StrLeft{\datemonthname}{3}. \thedateday, \thedateyear}
\newcommand{\mysubsection}[1]{\subsection{\mysubsectiontitle #1}}

\begin{document}


\tableofcontents

\mysection{}

\mysubsection{}
\nextdate
\mysubsection{}
\nextdate
\mysubsection{}
\nextdate
\mysubsection{}
\nextdate
\mysubsection{}

\mysection{}

\end{document}

The above covers the relevant code. Output:

EDIT 2: I can get rid of the warnings mentioned above by surrounding the \StrLeft{\datemonthname}{3} with \texorpdfstring{}{}, but that does not fix the Table of Contents not updating correctly problem.

Answer 1

Not 100% sure why \StrLeft is so bad here. But I chose a different route. By doing the month list manually we can ensure that there are no abbreviation dot after May.

\documentclass[12pt]{article}
\usepackage{xstring}
\usepackage{datenumber}
\setdatenumber{2024}{02}{26}
\newcommand\AbrevMonth{%
  \ifcase\value{datemonth}%
  \or Jan.%
  \or Feb.%
  \or Mar.%
  \or Apr.%
  \or May%
  \or Jun.%
  \or Jul.%
  \or Aug.%
  \or Sep.%
  \or Oct.%
  \or Nov.%
  \or Dec.%
  \fi%
}
\newcommand{\mysectiontitle}{\datemonthname~\thedateyear}
\newcommand{\mysection}[1]{\section{\mysectiontitle #1}}

\newcommand\mysubsectiontitle{Week of \AbrevMonth\ \thedateday, \thedateyear}
\newcommand{\mysubsection}[1]{\subsection{\mysubsectiontitle}}

\begin{document}


\tableofcontents

\mysection{}

\mysubsection{}
\nextdate
\mysubsection{}
\nextdate
\mysubsection{}
\nextdate
\mysubsection{}
\nextdate
\mysubsection{}

\mysection{}

\end{document}