How I can eliminate the date on the top right in a slide?

I use Warsaw theme but the date appear on the top right of each slide. How I can eliminate this date?

PREAMBLE

\documentclass{beamer}
\usetheme{Warsaw}
\useinnertheme{default}
\usefonttheme{default}
\usefonttheme{structurebold}
\setbeamertemplate{footline}[frame number]
\setbeamercovered{transparent}
\setbeamercovered{invisible}

\usepackage{latexsym}
\usepackage{pgf}
\usepackage{mathrsfs}
\usepackage[english]{babel}
\usepackage{verbatim}
\usepackage{epsfig}
\usepackage{graphicx}
\usepackage{color}
\usepackage{import}
\usepackage{transparent}
\usepackage{bussproofs}
\usepackage{qtree}
\usepackage{tree-dvips}
\usepackage{lingmacros}
\usepackage{mathrsfs}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{latexsym}
\usepackage{amsthm}
\setbeamercovered{dynamic}
\usepackage{newlfont}
\usepackage{multirow}
\usepackage{array,cmll}
\usepackage{mathdots}
\usepackage{textcomp}
\usepackage{bbding}
\usepackage{accents}
\usepackage{rotating}
\usepackage{logreq}
\usepackage{biblatex}
\usepackage{biblist}
\usepackage{hyperref}

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Please complete your code snippet until it becomes a complete document showing a typical frame exhibiting the problem, and remove the information that is not essential to the problem mentioned (surely most of all those loaded packages are not relevant here). – Gonzalo Medina Oct 8 '12 at 16:45
I tried to delete the packages one by one, and I find that the – pippigreco Oct 8 '12 at 17:33
the problematic package is "biblist". – pippigreco Oct 8 '12 at 17:34
\documentclass{beamer} \usetheme{Warsaw} \usefonttheme{default} \usepackage[english]{babel} \usepackage{biblist} \begin{document} \title[Warsaw_Date]{Warsaw_Date} \author[]{} \institute[]{} \date[]{} \frame{ \titlepage } \frame{ \frametitle{Warsaw} The date is hidden under the title Warsaw'. } \frame{ Here the date is visible, like in the initial slide. } \end{document} – pippigreco Oct 8 '12 at 17:34
@pippigreco What isn't clear is why one should load biblist in a Beamer presentation: it's a package for "pretty printing" bibliography databases and has no use in a normal document. – egreg Oct 8 '12 at 18:08

biblist defines an even/odd header by default. To remove this, redefine it after loading biblist:
\usepackage{biblist}% http://ctan.org/pkg/biblist
`