C# UTC转换成时间

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public class DateTimeUtil    {        private static DateTime utcStartTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);        /// <summary>        /// 转换为DateTime        /// </summary>        /// <param name="timeStamp">10位时间戳（单位：毫秒）</param>        /// <returns>DateTime</returns>        public static DateTime TimeStampToDateTime(long timeStamp)        {            return utcStartTime.AddMilliseconds(timeStamp).ToLocalTime();        }          /// <summary>        /// DateTime转换为时间戳        /// </summary>        /// <param name="dateTime"> DateTime</param>        /// <returns>10位时间戳（单位：毫秒）</returns>        public static long DateTimeToTimeStamp(DateTime dateTime)        {            return (long)(dateTime.ToUniversalTime() - utcStartTime).TotalMilliseconds;        }    }