I create a new Doc Type and enable List View and add 1 property. (DatePicker with time or just DatePicker) All the matching template does is display this date field value.

Then I create a content item using this DocType. Using the same Doc Type, I add 3-4 items child items into the list, with each getting a random date value. Save and Publish everything. When I go out to the page, I can see that the date field is showing up correctly. 

Then I click on 1 of the child items, and click on the Copy action.I copy it into the same list. Next, right click on the list and click Publish. Select option to publish all subpages and include unpublished child pages. Now when I go to each page, the date values don't show up correctly. They show up as a default value:

1/1/0001 12:00:00 AM

However, when I go into the back office, I can clearly see that those date values are correct. It isn't until I hit save&publish from the back office that the date will show up on the page correctly. 

Any help would be appreciated.