"the date the work was created" – all fine and dandy as long as everyone creates new presentations from scratch, and either finishes work within the day or doesn't mind a visible discrepancy <vbg> Most of my colleagues, and often for good reasons, will start from an existing presentation and modify it to make something new that needs to be saved as a new item.

A bit of integration between Office components would help, with the SaveDate field from Word available in PowerPoint. I have found a reference to a macro https://answers.microsoft.com/en-us/...b-771119b9fd77 and may investigate farther next time the question arises.