C#时间戳和DateTime转换

时间戳:格林威治时间1970年01月01日00时00分00秒(北京时间1970年01月01日08时00分00秒)起至现在的总时间。(中国为东8区 )

Unix时间戳转DateTime：

        /// <summary>
        /// Unix时间戳转DateTime
        /// </summary>
        /// <param name="timestamp">时间戳</param>
        /// <returns></returns>
        public static DateTime ConvertToDateTime(string timestamp)
        {
            DateTime time = DateTime.MinValue;
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970,1,1));
            if (timestamp.Length==10)        //精确到秒
            {
                time=startTime.AddSeconds(double.Parse(timestamp));
            }
            else if (timestamp.Length ==13)   //精确到毫秒
            {
                time = startTime.AddMilliseconds(double.Parse(timestamp));
            }
            return time;
        }

DateTime转时间戳:

        /// <summary>
        /// DateTime转时间戳
        /// </summary>
        /// <param name="time">DateTime时间</param>
        /// <param name="type">0为毫秒,1为秒</param>
        /// <returns></returns>
        public static string ConvertTimestamp(DateTime time,int type=0)
        {
            double intResult = 0;
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            if (type==0)
            {
                intResult = (time - startTime).TotalMilliseconds;
            }
            else if (type == 1)
            {
                intResult = (time - startTime).TotalSeconds;
            }
            else
            {
                Console.WriteLine("参数错误!");
            }
            return Math.Round(intResult, 0).ToString();
        }

 Tips:注意北京时间和格林威治时间