There are some keys missing in the definition of the glossary entries, amongst other issues.
\documentclass{article}
\usepackage[colorlinks]{hyperref}
\usepackage[acronym]{glossaries}
\newglossaryentry{utc}{name=utc,description={Coordinated Universal Time}}
\newglossaryentry{adt}{name=adt,description={Atlantic Daylight Time}}
\newglossaryentry{est}{name=est,description={Eastern Standard Time}}
\makeglossaries
\begin{document}
The code is for testing the glossaries list.
%Adding the acronyms to the glossary without displaying them here:
\glsadd{utc}\glsadd{adt}\glsadd{est}
\printglossaries
\end{document}
Compile, for example, with this 'pipeline'
pdflatex foo
makeindex -s foo.ist -o foo.gls foo.glo
pdflatex foo
Edit See the comment by user cmhughes for other ways to generate the document with the glossary.
Edit Usage of the makeglossaries script is of course much easier in order to generate the glossaries.

For further usage, I refer to the documentation of the package, see for example http://mirrors.ctan.org/macros/latex/contrib/glossaries/glossariesbegin.pdf
\glsadd{utc}in your document. Defining a glossary entry via\newglossaryentrydoes not provide a glossary at all. – Jul 20 '14 at 13:27\newacronymrather than\newglossaryentry, given you have used theacronymoption. (In which case, you need an extra argument\newacronym{utc}{utc}{Coordinated Universal Time}.) Also, I recommend you move the definitions to the preamble as in @ChristianHupfer's answer (see Drawbacks With Defining Entries in the Document Environment) – Nicola Talbot Jul 20 '14 at 13:41acronymoption etc, but I did not want to change too much on the MWE – Jul 20 '14 at 13:45