Is anybody able to show the clock in beamer?

Question

I wonder whether there is anyone who is able to show the clock in a beamer presentation. I have not come across any working example. Following the tdclock documentation, I compiled the MWE below. It shows only blank boxes where the date and time are supposed to appear, see pdf attached. I would appreciate any advice.

\documentclass[xcolor=dvipsnames]{beamer}
\usepackage{beamerthemeshadow}

\usepackage[font=Helv,timeinterval=60]{tdclock}
\setbeamertemplate{headline}{\initclock\large{\tdyear-\tdmonth-\tdday
\quad\tdhours:\tdminutes}}

\usepackage{xcolor}

\title[]{Main Title}
\author[]{Zilore Mumba}
\institute[]{Unza}

\usepackage[font=Helv,timeinterval=60]{tdclock}
\setbeamertemplate{headline}{\initclock\large{\tdyear-\tdmonth-\tdday\quad\tdhours:\tdminutes}}

\usepackage{xkeyval}
\usepackage{hyperref}

\begin{document}
 \initclock

\title{Beamer Presentation}
\author{Zilore Mumba}

\begin{frame}
\titlepage
\end{frame}

\begin{frame}\frametitle{first slide}
content
\end{frame}

\end{document}