How to find all DateTime properties of anonymous object?

Question

I want to convert all dates received from client into UTC before processing them in server side code. I am thinking to use ActionFilter where I want to find all the date fields from Request payload and convert those into UTC dates. I know Reflection helps in finding properties by it's type but it doesn't work in case of Anonymous objects.

Below is my code sample

        //convert body to object
        var result = JsonConvert.DeserializeObject<object>(rawRequest);
        var type = result.GetType();

        //get collection of properties from object
        var properties = result.GetType().GetProperties();
        foreach (var property in properties)
        {
            //if data type is DateTime then convert into UTC
            if (property.PropertyType == typeof(DateTime?) || property.PropertyType == typeof(DateTime))
            {
                string TimeZoneId = "India Standard Time";
                if (HttpContext.Current.Request.Headers["TimeZoneId"] != null)
                {
                    TimeZoneId = HttpContext.Current.Request.Headers.GetValues("TimeZoneId").FirstOrDefault();
                }
                var localTimeZone = TimeZoneInfo.FindSystemTimeZoneById(TimeZoneId);
                var Date = DateTime.SpecifyKind(((DateTime?)property.GetValue(result, null)) ?? DateTime.Now, DateTimeKind.Unspecified);
                var localTime = TimeZoneInfo.ConvertTimeToUtc(Date, localTimeZone);
            }
        }