Convert UTC seconds in integer to DateTime property

Question

I get data from an API which looks like this:

{
    created_utc: 1442108087,
    body: "test"
}

And here is my Strongly-typed class that I use for deserialization:

public class Comment
{
    [JsonProperty("created_utc")]
    public DateTime CreatedUtc { get; set; }

    [JsonProperty("body")]
    public string Body { get; set; }
}

Using Json.Net how I can resolve this created_utc property, which is in JS Number format to DateTime in UTC in C#?

Answer 1

You can try this

[JsonProperty("created_utc")]
[JsonConverter(typeof(UTCDateTimeConverter))]
public DateTime CreatedUtc { get; set; }

---

public class UTCDateTimeConverter : JsonConverter
{
    public override object ReadJson(
        JsonReader reader,
        Type objectType,
        object existingValue,
        JsonSerializer serializer)
    {
        long ts = serializer.Deserialize<long>(reader);

        return TimeUtils.GetMbtaDateTime(ts);
    }

    public override  bool CanConvert(Type type)
    {
        return typeof(DateTime).IsAssignableFrom(type);
    }

    public override void WriteJson(
        JsonWriter writer,
        object value,
        JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }

    public override bool CanRead
    { 
        get { return true; } 
    }
}

Another Approach which might be more easier to me

[JsonProperty(ItemConverterType = typeof(UTCDateTimeConverter))]
public DateTime CreatedUtc { get; set; }

---

var AllComments = JsonConvert.DeserializeObject<Comment>(json, new UTCDateTimeConverter());

---

public class UTCDateTimeConverter : Newtonsoft.Json.JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(DateTime);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        return new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds((long)reader.Value);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}