There is no difference in this feature specifically from Pro to Community or Enterprise.  It is the same core platform feature.  However, the most obvious question is, are you sure the date(s) you entered are within the range of the expected behavior?

As an example, I just tried this from a clean install of DNN 6.0, and it worked.  If the "Start Date" is in the future, then you should see something like this example.

That being said, this is something that would be best addressed via your DotNetNuke Support Center since you're a customer.  You should enter a ticket there, or simply email them at customercare@dnncorp.com.

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Will Strohl

Upendo Ventures DNN experts since 2003 Official provider of the Hotcakes Commerce Cloud and SLA support

I just chose a random date.  This time, I chose tomorrow and tried again, it worked as expected.  Perhaps the Site Settings have a different date/time zone that is around 8-12 hours ahead, or your web server sits in or has a setting for a similarly disparate time zone.

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Will Strohl

Upendo Ventures DNN experts since 2003 Official provider of the Hotcakes Commerce Cloud and SLA support