String date property of object is deserialized to another format even though it should remain unchanged

Question

I am trying to deserialize Customer objects from a string representing a JArray. One of the properties is a Date as string:

public class Customer: ICustomer
{
    [JsonProperty(Order = 0)]
    public string CreationDate{ get; set; }
}

In the JSON, the CreationDate is set to "2015-12-31T00:00:00+01:00", which is the exact string I expect to find in my deserialized object.

I have written the following to deserialize the objects :

protected Collection<Customer> GetCustomers(string jsonText)
{
    var jobject = JArray.Parse(jsonText);
    var allClients = new Collection<Customer>()
    var jsonSerializer = new JsonSerializer
    { 
        DateParseHandling = Newtonsoft.Json.DateParseHandling.None;
    };

    foreach (var child in jobject.Children())
    {
        var customer= child.ToObject<Customer>(jsonSerializer);
        allClients.Add(customer);
    }
    return allClients;
}

However, the value of the CreationDate in my deserialized Customer is equal to "12/31/2015 00:00:00", as if the DateParseHandling attribute is ignored. Why?