%%
%% creating ONLY slide/frame number
%%
\makeatletter
\setbeamertemplate{footline}{  \hfill{
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}
    \insertframenumber\hspace*{2ex}
  \end{beamercolorbox}}
}
\makeatother