Decodable Property Wrapper

UnixTimeCodedDate.swift

import Foundation

@propertyWrapper
struct UnixTimeCodedDate {
    var wrappedValue: Date?

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

extension UnixTimeCodedDate: Decodable {
    init(from decoder: Decoder) {
        do {
            let unixTime = try TimeInterval(from: decoder)
            wrappedValue = Date(timeIntervalSince1970: unixTime)
        } catch {
            wrappedValue = nil
        }
    }
}

extension KeyedDecodingContainer {
    func decode(_ type: UnixTimeCodedDate.Type, forKey key: Key) throws -> UnixTimeCodedDate {
        try decodeIfPresent(type, forKey: key) ?? .init(wrappedValue: nil)
    }
}