Date Decoding Strategy

DateDecodingStrategy.swift

import Foundation

struct ISODateModel: Codable {
    let date: Date
}

var json = """
{
    "date": "2018-04-20T14:20:00-0700"
}
""".data(using: .utf8)!

let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .iso8601
let isoModel = try decoder.decode(ISODateModel.self, from: json)

print(isoModel.date) //2018-04-20 21:20:00 +0000


struct UnixDateModel: Codable {
    let date: Date
}

json = """
{
    "date": 1213213123
}
""".data(using: .utf8)!

decoder.dateDecodingStrategy = .secondsSince1970
let unixModel = try decoder.decode(UnixDateModel.self, from: json)

print(unixModel.date) //2008-06-11 19:38:43 +0000


decoder.dateDecodingStrategy = .custom { decoder -> Date in
    let container = try decoder.singleValueContainer()
    let unixTime = try container.decode(Double.self)
    let date = Date(timeIntervalSince1970: unixTime)
    return date.addingTimeInterval(120)
}

let customUnixModel = try decoder.decode(UnixDateModel.self, from: json)

print(customUnixModel.date) //2008-06-11 19:38:43 +0000


struct FormattedDateModel: Codable {
    let date: Date
}

json = """
{
    "date": "08-31-2018 18:49"
}
""".data(using: .utf8)!

let dateFormatted = DateFormatter()
dateFormatted.dateFormat = "MM-dd-yyyy HH:mm"
decoder.dateDecodingStrategy = .formatted(dateFormatted)
let formattedModel = try decoder.decode(FormattedDateModel.self, from: json)

print(formattedModel.date) //2018-08-31 15:49:00 +0000