Strong reference in Date extension Swift

Question

I tried to check my app for memory leaks using Leaks from Instrument. It turns out that the Leaks points out that the memory leak is in on of my extension: Date. The extension function is used inside a View struct in swiftUI to a @Published date: Date property from my viewModel. Am I doing something wrong? What do I have to do to not have a strong reference inside the extension? here is my extension:

extension Date {
    func toString(withFormat customFormat: String = "dd MMM YYYY") -> String {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = customFormat
        return dateFormatter.string(from: self)
    }
}

This is the struct that has a date as a property:

struct Article: Codable, Hashable {
    let source: Source?
    let title: String?
    let author: String?
    let description: String?
    let url: String?
    let urlToImage: String?
    let publishedAt: Date?
    let content: String?
}

My ViewModel that has arrays of Articles:

    class NewsListViewModel: ObservableObject {
        @Published var searchedArticles = [Article]()
        @Published var tabsArticles = [Tabs : [Article]] ()
        @Published var isSearching = false
        @Published var searchText = ""
        @Published var selectedTab = Tabs.general
        @Published var error: Error?
    }

And the My main list view:

struct NewsList: View {
    @ObservedObject var viewModel: NewsListViewModel
    
    var body: some View {
        NavigationView {
            //.....//
            ScrollableNewsListView(articles: articles, category: viewModel.selectedTab.rawValue, checkLastCellAction: checkActionForLastCell)
            //.....//
            
        }
    }
}

StrollableView:

private struct ScrollableNewsListView: View {
    var articles: [Article]

    var body: some View {
         //.....//
         ForEach(articles.indices, id: \.self) { index in
                 NewsCell(article: articles[index])
                     .onAppear {
                         checkLastCellAction(index)
                         //checkActionForLastCell(index: index)
                     }                        
         }
         //.....//
    }
}

The cellView that I user inside a LazyVStack:

private struct NewsCell: View {
    var article: Article
    
    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            HStack {
                URLImage(url: imageURL)
                    .frame(width: 50, height: 50)
                    .cornerRadius(25)
                VStack(alignment: .leading) {
                    Text(article.author ?? "news_details_unknown_author".localized)
                    Text(dateString)// <-------- HERE I USE MY DateString that calls .toString() from Date extension
                        .font(.SFDisplayRegularFont(with: 12))
                        .foregroundColor(.gray)
                }
                Spacer()
            }

        }.padding(.all, 15)
        .background(Color.newsCellBackground)
        .cornerRadius(10)
    }
    var dateString: String {
        guard let date = article.publishedAt else { return ""}
        return date.toString()//<------------ Date.toString()
    }
    
    var title: String {
        article.title ?? ""
    }
}

Picture of Leaks from Instruments: