I'm working with `report`and I'd like to change title format without `titlesec`, because my headers and footers are implemented using fancy style, and it produces errors.

By default, `\chapter`command gets:

```
Chapter 1

Chapter Title

```

I'd like to have:

```
1 Chapter title

```

Can someone please help me to get this result?

Thank you.

**EDIT :**

I tried with your code, and I almost get what i'm looking for, but it appears an error that place symbol @ before word chapter. I let my code in order to find the solution easier. Thank you again.

```
\documentclass[a4paper,openright,12pt]{report}
\usepackage[spanish]{babel}
\usepackage[utf8]{inputenc} 
\usepackage{fancyhdr}%Temas de numeración de páginas
\usepackage{titling}
\usepackage{graphicx}%Introducir encabezados LaTex
\usepackage{hyperref}%Hiperlinks índices
\usepackage{vmargin}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[mathscr]{eucal}
\setlength{\parindent}{0pt}
\graphicspath{{../Figuras/}}
\date{date}
%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Modify chapter format
\makeatletter
\def\@makechapterhead#1{%
\vspace*{50\p@}%
{\parindent \z@ \raggedright \normalfont
    \ifnum \c@secnumdepth >\m@ne
    \huge\bfseries
    % \@chapapp\space % removed
    \thechapter
    ~% \par\nobreak\vskip 20\p@ % replaced
    \fi
    \interlinepenalty\@M
    \huge % \Huge % replaced
    \bfseries #1\par\nobreak
    \vskip 40\p@
}}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%Eliminar visualización hipervínculos índices
\hypersetup{
colorlinks,
citecolor=black,
filecolor=black,
linkcolor=black,
urlcolor=black
}

%%%%%%%%%%%%%

%Definición de formato de hoja

\setmargins{2.5cm}        % margen izquierdo
{1.25cm}                  % margen superior
{16.5cm}                  % anchura del texto
{23.3cm}                  % altura del texto
{5pt}                     % altura de los encabezados
{1.5cm}                   % espacio entre el texto y los encabezados
{20pt}                    % altura del pie de página
{1.5cm}                   % espacio entre el texto y el pie de página

%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\headheight 40pt 
\headsep 30pt

% aqui definimos el encabezado de las paginas pares e impares.

\chead[\thedate \\ Título de Proyecto]{\thedate \\ title}
\rhead[\leftmark]{\leftmark}
\renewcommand{\headrulewidth}{0.5pt}

% aqui definimos el pie de pagina de las paginas pares e impares.
\cfoot[\thepage]{\thepage}
\renewcommand{\footrulewidth}{0.5pt}

\fancypagestyle{capitulo}{      
\fancyhead[C]{\thedate \\ title}
\fancyhead[R]{\leftmark}
\fancyfoot[C]{\thepage}
\renewcommand{\headrulewidth}{0.5pt}
}

%Encabezado especial índices
\fancypagestyle{especial}{
\fancyhead[R]{\nouppercase{\leftmark}}
}
\pagestyle{fancy}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%COMIENZO DOCUMENTO

\begin{document}

%%%%%%%%%%%%%

%CREACIÖN DE LOS ÍNDICES

\tableofcontents 
\thispagestyle{especial}

%%%%%%%%%%%%%

\chapter{Chapter}\label{capitulo}
\thispagestyle{capitulo}
bla bla bla

\section{Section}\label{seccion}
ble ble ble 

\end{document}

```

This is the way that currently is shown:

[![enter image description here](https://i.stack.imgur.com/jZmbj.png)](https://i.stack.imgur.com/jZmbj.png)