Display ' apostrophe

It's a rather unusual convention, but if you want it then:

\documentclass{article}
\usepackage{textcomp}
\begin{document}
    `It\textquotesingle s a nice day!'
\end{document}

David's answer is preferable, but here's another option if you don't want to load any package to take care of it.

\documentclass{article}
\begin{document}
`It\textsc{\char13}s a nice day!'
\end{document}