You will need to use vba

The code itself is fairly easy and would be based on

Sub days2go()
Dim daysleft As Long
Dim targetDate As Date
targetDate = "20 April,2013"
daysleft = DateDiff("d", Now, targetDate)
ActivePresentation.Slides(1).Shapes(2).TextFrame.T extRange = "There are " & daysleft & " days to go."
End Sub

The problem is that it will be difficult to make it run automatically and therefore change. How does the information change? Can someone click a button once a day to run the code?

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