If you insert a date on your slide master or on a slide, PowerPoint updates the data during the slide show, not even if you tick the “Automatic Update”.
To view the presentation during a dynamic time there is a free add-in for Microsoft PowerPoint, the “date-time auto” add-in.
Auto datetime update keeps the inserted date / time during the presentation using the system time of the computer. You can also configure it appears the time that has elapsed since the start of the presentation. Autodate time you can also customize how the date and time in different formats.
Current time is during the PowerPoint presentation
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