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CHDataManagement/Model/DateItem.swift

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+import Foundation
+
+protocol DateItem {
+
+    var startDate: Date { get }
+
+    var hasEndDate: Bool { get }
+
+    var endDate: Date { get }
+}
+
+extension DateItem {
+
+    private func datePrefixString(in language: ContentLanguage) -> String {
+        guard Calendar.current.isDate(startDate, equalTo: endDate, toGranularity: .year) else {
+            // Different year, return full string
+            return startDate.formatted(date: .long, time: .omitted)
+        }
+        guard Calendar.current.isDate(startDate, equalTo: endDate, toGranularity: .month) else {
+            // Different month
+            return DateItemStorage.dayAndMonth(of: startDate, in: language)
+        }
+
+        return DateItemStorage.day.string(from: startDate)
+    }
+
+    func dateText(in language: ContentLanguage) -> String {
+        guard hasEndDate else {
+            return DateItemStorage.dateString(for: startDate, in: language)
+        }
+        let endText = DateItemStorage.dateString(for: endDate, in: language)
+        return "\(datePrefixString(in: language)) - \(endText)"
+    }
+}
+
+private enum DateItemStorage {
+
+    static let englishDate: DateFormatter = {
+        let df = DateFormatter()
+        df.locale = .init(identifier: "en")
+        df.dateFormat = "d. MMMM yyyy"
+        return df
+    }()
+
+    static let germanDate: DateFormatter = {
+        let df = DateFormatter()
+        df.locale = .init(identifier: "de")
+        df.dateFormat = "d. MMMM yyyy"
+        return df
+    }()
+
+    static let englishDayAndMonth: DateFormatter = {
+        let df = DateFormatter()
+        df.locale = .init(identifier: "en")
+        df.dateFormat = "d. MMMM"
+        return df
+    }()
+
+    static let germanDayAndMonth: DateFormatter = {
+        let df = DateFormatter()
+        df.locale = .init(identifier: "de")
+        df.dateFormat = "d. MMMM"
+        return df
+    }()
+
+    static let day: DateFormatter = {
+        let df = DateFormatter()
+        df.dateFormat = "d."
+        return df
+    }()
+
+    static func dayAndMonth(of date: Date, in language: ContentLanguage) -> String {
+        switch language {
+        case .english: return englishDayAndMonth.string(from: date)
+        case .german: return germanDayAndMonth.string(from: date)
+        }
+    }
+
+    static func dateString(for date: Date, in language: ContentLanguage) -> String {
+        switch language {
+        case .english: return englishDate.string(from: date)
+        case .german: return germanDate.string(from: date)
+        }
+    }
+}