C#时间转换1443801600000解决思路

C#时间转换1443801600000
 {
                "pubTime":1443801600000,
                "value":54
            },
            {
                "pubTime":1443888000000,
                "value":137
            },
            {
                "pubTime":1443974400000,
                "value":262
            },
            {
                "pubTime":1444060800000,
                "value":334
            },

这种1443801600000 的值 怎么转换为对应的时间？？


------解决思路----------------------

new DateTime(1443801600000 * 10000L + 621355968000000000L);

------解决思路----------------------
DateTime dt=new Date(1970,1,1);
DateTime t=dt.Add(1443801600000);