Displaying Dates and Times (datetime2.sty)
This example requires the datetime2 package, but with the en-GB option it additionally requires the datetime2-english module.
\documentclass{article}
\usepackage[en-GB]{datetime2}
\newcommand*{\DateStamp}{2015-11-28T20:13:04Z}
\DTMsavetimestamp{mydate}{\DateStamp}
\DTMsavetimestamp{mydate2}{2014-06-01T09:01:58+01:00}
\begin{document}
Now: \DTMnow.
Saved: \DTMuse{mydate}; \DTMuse{mydate2}.
\end{document}
Download sample-datetime2.tex or sample-datetime2.pdf.