尝试专门使用IsoDateTimeConverter指定DateTime格式，并将其传递给JsonConvert.DeserializeObject<>()方法.

Try specifying the DateTime format specifically using an IsoDateTimeConverter, and pass it into the JsonConvert.DeserializeObject<>() method.

...
var json = Request.RequestContext.HttpContext.Request.Params["EoiDraftModel"];

var format = "dd/MM/yyyy"; // your datetime format
var dateTimeConverter = new IsoDateTimeConverter { DateTimeFormat = format };

var ld = JsonConvert.DeserializeObject<EoiDraftViewModel>(json, dateTimeConverter);
...