Gold Challenge: Pushing More View Controllers
Right now, instances of BNRItem cannot have their dateCreated property changed. Change BNRItem so that they can, and then add a button underneath the dateLabel in BNRDetailViewController with the title Change Date. When this button is tapped, push another view controller instance onto the navigation stack. This view controller should have a UIDatePicker instance that modifies the dateCreated property of the selected BNRItem.
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