Swift Codable + Date

CodableDate.swift

// Fix for error: "Expected to decode Double but found a string/data instead"

public struct CodableEntity: Codable {
    public let myBool: Bool
    public let myDate: Date
    public let myInt: Int
}


let jsonData = Data("""
    {
      "myBool": true,
      "myDate": "2018-12-12",
      "myInt": 4
    }
""".utf8)

// This bitch here.
let dateFormatter = DateFormatter()
dateFormatter.calendar = Calendar(identifier: .iso8601)
dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
dateFormatter.dateFormat = "yyyy-MM-dd"

let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .formatted(dateFormatter)

let myCodableEntity = try! decoder.decode(CodableEntity.self, from: jsonData)


// GMT Example

extension Date {

    /// Returns a `Date` in `GMT` format, that is: "yyyy-MM-dd HH:mm:ss VV" and `TimeZone(secondsFromGMT: 0)`.
    ///
    /// - Parameter givenDate: If informed and in the expected format ("yyyy-MM-dd HH:mm:ss VV"), tries to initialize
    /// a `Date` object with it and then return as GMT.
    /// - Returns: `Date` object in `GMT` format
    func asGMT(fromDate givenDate: String = "") -> Date? {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss VV"
        formatter.timeZone = TimeZone(secondsFromGMT: 0)
        let dateString = givenDate.isEmpty ? formatter.string(from: self) : givenDate
        return formatter.date(from: dateString)
    }
}

//This bitch here

Maybe one of the greatest comments I've ever seen