I am using \usetheme{Warsaw}. It seems that it doesn't depend on the theme. Does anyone know how to remove the date in the title page?
[Tex/LaTex] Is it possible to remove date in the title page of Beamer
beamertitles
Related Solutions
The »plain« option for the frame environment is probably what you are looking for.
\begin{frame}[plain]
\titlepage
\end{frame}
Details about that in the beamer manual.
You can redefine the title page template and introduce the necessary modifications for the layout; this redefinition is needed since both the title and the subtitle are, by deafult, inside the same beamercolorbox so simply redefining the title beamer color would produce a box around both title and subtitle (which is not wanted here):
\documentclass{beamer}
\title{TITLE}
\titlegraphic{\includegraphics[height=4cm]{cat}}
\subtitle{\textbf{Subtitle}}
\author{Author}
\setbeamercolor{title}{bg=orange,fg=white}
\makeatletter
\setbeamertemplate{title page}
{
\vbox{}
\vfill
\begin{centering}
\begin{beamercolorbox}[sep=8pt,center]{title}
\usebeamerfont{title}\inserttitle
\end{beamercolorbox}
\setbeamercolor{title}{bg=white,fg=structure}
\begin{beamercolorbox}[sep=8pt,center]{title}
{\usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par}
\ifx\insertsubtitle\@empty%
\else%
\vskip0.25em%
{\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
\fi%
\end{beamercolorbox}%
\vskip1em\par
\begin{beamercolorbox}[sep=8pt,center]{author}
\usebeamerfont{author}\insertauthor
\end{beamercolorbox}
\vskip-1em\par % change here
\begin{beamercolorbox}[sep=8pt,center]{institute}
\usebeamerfont{institute}\insertinstitute
\end{beamercolorbox}
\begin{beamercolorbox}[sep=8pt,center]{date}
\usebeamerfont{date}\insertdate
\end{beamercolorbox}\vskip0.5em
\end{centering}
\vfill
}
\makeatother
\begin{document}
\maketitle
\end{document}
Notice that now there's no need to use \title[TITLE]{TITLE\includegraphics{...}} but now you can simply use \title{TITLE} and \titlegraphic{\includegraphics[]{}}`. Of course, feel free to make the necessary adjutments according to your particular needs (yo can play with the lengths in the \vskip commands to adjust vertical spacing).
As requested in a comment, to have a colored box around only the subtitle, the necessary modifications are the following:
\documentclass{beamer}
\title{TITLE}
\titlegraphic{\includegraphics[height=4cm]{cat}}
\subtitle{\textbf{Subtitle}}
\author{Author}
\makeatletter
\setbeamertemplate{title page}
{
\vbox{}
\vfill
\begin{centering}
\begin{beamercolorbox}[sep=8pt,center]{title}
\usebeamerfont{title}\inserttitle
\end{beamercolorbox}
{\usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par}
\ifx\insertsubtitle\@empty%
\else%
\vskip0.25em%
\setbeamercolor{title}{bg=orange,fg=white}
\begin{beamercolorbox}[sep=8pt,center]{title}
{\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
\fi%
\end{beamercolorbox}%
\vskip1em\par
\begin{beamercolorbox}[sep=8pt,center]{author}
\usebeamerfont{author}\insertauthor
\end{beamercolorbox}
\vskip-1em\par % change here
\begin{beamercolorbox}[sep=8pt,center]{institute}
\usebeamerfont{institute}\insertinstitute
\end{beamercolorbox}
\begin{beamercolorbox}[sep=8pt,center]{date}
\usebeamerfont{date}\insertdate
\end{beamercolorbox}\vskip0.5em
\end{centering}
\vfill
}
\makeatother
\begin{document}
\maketitle
\end{document}
With a new request, here's the code to change at will the width of the box used for the subtitle; change the length used for \subtitwd (initially set to 4cm) according to your needs:
\documentclass{beamer}
\newlength\subtitwd
\setlength\subtitwd{4cm}% change the width here
\makeatletter
\setbeamertemplate{title page}
{
\vbox{}
\vfill
\begin{centering}
\begin{beamercolorbox}[sep=8pt,center]{title}
\usebeamerfont{title}\inserttitle
\end{beamercolorbox}
{\usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par}
\ifx\insertsubtitle\@empty%
\else%
\vskip0.25em%
\setbeamercolor{title}{bg=orange,fg=white}
\vbox{%
\hfill\begin{beamercolorbox}[wd=\subtitwd,sep=8pt,center]{title}
{\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
\end{beamercolorbox}\hfill\null%
}%
\fi%
\vskip1em\par
\begin{beamercolorbox}[sep=8pt,center]{author}
\usebeamerfont{author}\insertauthor
\end{beamercolorbox}
\vskip-1em\par % change here
\begin{beamercolorbox}[sep=8pt,center]{institute}
\usebeamerfont{institute}\insertinstitute
\end{beamercolorbox}
\begin{beamercolorbox}[sep=8pt,center]{date}
\usebeamerfont{date}\insertdate
\end{beamercolorbox}\vskip0.5em
\end{centering}
\vfill
}
\makeatother
\title{TITLE}
\titlegraphic{\includegraphics[height=4cm]{cat}}
\subtitle{\textbf{Subtitle}}
\author{Author}
\begin{document}
\maketitle
\end{document}
Best Answer
\date{}should work in Beamer, too.