Updating a field in a presentation each time it is opened

[Guest]

I have what seems like a simple requirement, but I can't find how to do it. I
need a field to recalculate or update, each time I open a powerpoint. However
I don't want to link to an excel sheet as I don't want the user to be asked
to update links. I need it to be completely seemless to the user. Simply
everytime they open the presentation the difference in days, between a fixed
date and the current date is recalculated.

Can this be done?

 

[Steve Rindsberg]

I have what seems like a simple requirement, but I can't find how to do it. I
need a field to recalculate or update, each time I open a powerpoint. However
I don't want to link to an excel sheet as I don't want the user to be asked
to update links. I need it to be completely seemless to the user. Simply
everytime they open the presentation the difference in days, between a fixed
date and the current date is recalculated.

Can this be done?

Not w/o VBA and then only if you can ensure that the user has installed an
add-in. Presentations themselves can't automatically execute code.