[mso] Powerpoint: Countdown time- Possible?

Is it possible to take two times, let's say the current time is 1500 
(3:00pm) and the time of the presentation is 1530 (3:30pm).

I know how to make a slide display the computer's clock, but does anyone 
know how to give PowerPoint a target time, let it determine the difference 
)in this case, 30 minutes), and display that? I thought it would be a neat 
way to alert people what time it starts.

I am envisioning just displaying the minutes and seconds in format MM:SS. 
That will allow me to start it 59 minutes 59 seconds before the 
presentation, but I don't expect to be let in the room that early.

Thank you.

Robert


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