2.1.1154 Part 1 Section 20.226, presentation:display-date-time
a. The standard defines the attribute presentation:display-date-time, contained within the element <style:drawing-page-properties>
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This attribute is supported in PowerPoint 2013, PowerPoint 2016, and PowerPoint 2019.
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On load, this attribute is read to determine whether to display the date and time. It is not written on save.