gistfile1.txt

     let centeredIndexPath = IndexPath.init(item: selectedDate, section: 0)
        collectionView.scrollToItem(at: centeredIndexPath, at: .centeredHorizontally, animated: true)
            if indexPath == centeredIndexPath {
            collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true)
            }