DataGridView,Json,DeserializeObject and change values

i am getting a json and Deserialize it.

i have classes :

class RootObject
    {
        public EventInfo eventInfo { get; set; }
        public ItemID itemID { get; set; }
        public string customerId { get; set; }
        public object actualStartTime { get; set; }
    }

 class EventInfo
    {
        public string name { get; set; }
        public string sDate { get; set; }
        public string sTime { get; set; }
        public string country { get; set; }

    }

1. when i Deserialize the Json, the key : actualStartTime  is long (unix time),

can i in this step to convert it to time?

2. when i bind the json to the dataGridView can i choose what to bind and what not to bind , current code :

 var input = Tools.JsonGet(url);
            var result = JsonConvert.DeserializeObject<List<RootObject>>(input);
            dataGrid1.DataSource = resu

3. the EventInfo class, appears as class name in the data grid, can i select column from this class and display them as columns in the data grid as well?

Thanks!