How can I decode date string to Date object from JSON? - json

Question

How can I decode timestamp to Date from JSON?
I get my date from the server as Json like this:
{
"date": "2610-02-16T03:16:15.143Z"
}
and im trying to build a Date class from it:
class Message : Decodable {
var date: Date
}
its not working as Expected I am getting this error:
Failed to fetch messages: typeMismatch(Swift.Double, Swift.DecodingError.Context(codingPath: [_JSONKey(stringValue: "Index 0", intValue: 0), CodingKeys(stringValue: "date", intValue: nil)], debugDescription: "Expected to decode Double but found a string/data instead.", underlyingError: nil))

Answer 1

When decoding date info like this, you need to use a custom dateDecodingStrategy, and set the date parser's timezone and locale:
let data = """
{
"date": "2610-02-16T03:16:15.143Z"
}
""".data(using: .utf8)!
struct Message: Codable {
let date: Date
}
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.timeZone = TimeZone(identifier: "GMT")
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .formatted(formatter)
do {
let message = try decoder.decode(Message.self, from: data)
print(message.date)
} catch {
print(erroor)
}