Property wrappers to serialise date

CodableDate

extension Date {
    static let decodeFormats: [String] = ["yyyy-MM-dd'T'HH:mm:ss.SSSZ"]

    func encodedDateString() -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
        return formatter.string(from: self)
    }
}

extension String {
    func decodedDate() -> Date? {
        let formatter = DateFormatter()
        var value: Date?
        Date.decodeFormats.forEach {
            formatter.dateFormat = $0
            if let date = formatter.date(from: self) {
                value = date
                return
            }
        }
        return value
    }
}

@propertyWrapper
public struct OptionalCodableDate: Codable {
    public var wrappedValue: Date?

    public init(wrappedValue: Date?) {
        self.wrappedValue = wrappedValue
    }

    public init(from decoder: Decoder) throws {
        // String to date
        let container = try decoder.singleValueContainer()
        let dateString = try container.decode(String.self)

        if let value = dateString.decodedDate() {
            wrappedValue = value
        } else {
            throw DecodingError.dataCorruptedError(in: container, debugDescription: "Cannot decode date string \(dateString)")
        }
    }

    public func encode(to encoder: Encoder) throws {
        guard let wrappedValue = wrappedValue else {
            return
        }
        // Date to string
        var container = encoder.singleValueContainer()
        try container.encode(wrappedValue.encodedDateString())
    }
}

@propertyWrapper
public struct CodableDate: Codable {
    public var wrappedValue: Date

    public init(wrappedValue: Date) {
        self.wrappedValue = wrappedValue
    }

    public init(from decoder: Decoder) throws {
        // String to date
        let container = try decoder.singleValueContainer()
        let dateString = try container.decode(String.self)

        if let value = dateString.decodedDate() {
            wrappedValue = value
        } else {
            throw DecodingError.dataCorruptedError(in: container, debugDescription: "Cannot decode date string \(dateString)")
        }
    }

    public func encode(to encoder: Encoder) throws {
        // Date to string
        var container = encoder.singleValueContainer()
        try container.encode(wrappedValue.encodedDateString())
    }
}