\documentclass[oneside]{book} \usepackage{ifthen}\title{\Huge An unremarkable Diary\\\Large of unremarkable things\\ \small By an unremarkable person} \date{} \author{Mattia Mascarello} \usepackage{titlesec} \usepackage{blindtext} \titleformat{\chapter} {\Large\bfseries} % format {} % label {0pt} % sep {\huge} \newcommand*{\dayOrdinalSuffix}[1] { \ifthenelse{\equal{#1}{1}}{st}{ \ifthenelse{\equal{#1}{2}}{nd}{ \ifthenelse{\equal{#1}{3}}{rd}{ \ifthenelse{\equal{#1}{21}}{st}{ \ifthenelse{\equal{#1}{22}}{nd}{ \ifthenelse{\equal{#1}{23}}{rd}{th} } } } } } } \newcommand*{\justifyheading}{\raggedleft} \renewcommand{\sectionmark}[1]{\markboth{#1}{}} % set the \leftmark \titleformat{\section}{\normalfont\Large\bfseries}{}{0pt}{} \titleformat{\subsection}{\normalfont\small\bfseries\justifyheading}{}{0pt}{}[{\titlerule[0.8pt]}] \newcommand{\dayH}[3]{ \subsection{#1 $#2^{\protect\dayOrdinalSuffix{#2}}$} \begin{flushright}#3\end{flushright}} \newcommand{\yearH}[1]{\chapter{$#1$}} \newcommand{\monthH}[1]{\section{#1}} \begin{document} \maketitle \tableofcontents \chapter{Preamble} o \newpage REPLACETHIS \end{document}