Live Clock in Powerpoint for Mac 2016

Please reply with links if you know of a product that will display a real time digital clock on every 2016 Powerpoint for Mac slide while in presentation mode.

There are several options for this on PC, most notably: www.presentationpoint.com and www.officeoneonline.com but have yet to find a product for a Mac; perhaps because these PC products are flash based?

Thank you in advance for your time and experience.

Darrell