Updates Values on Excel and PPT - excel

I wanted to create an excel file that calculates the days diference between a fixed date and today's date and display that value in a PPT.
1st Problem: If I change my date on the computer, the Today Cell does not change by itself; I tried to make a Vba code for Update but it didn't work
2nd Problem: the PPt value change automatically But If I put the PPt in Presentation Mode I lose the connection, and I have to update the connection again.
Note: If there is a way to do all the calculation in the PPt it will be Correct
Thank you

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