// ToLocalTime() UTC时间转换为本地时间public static DateTime UtcToDateTime(long number){              return new DateTime(1970, 1, 1, 0, 0, 0, 0).AddSeconds(number).ToLocalTime();}//本地时间转换成UTC时间 C#和Unix时间戳的转换private static long DateTimeToUtc( DateTime dt){   return ( long)(dt.ToUniversalTime() - ( new DateTime(1970, 1, 1, 0, 0, 0, 0))).TotalSeconds;}