C#实现时间戳的简单方法

 /// <summary>
  /// 时间工具类
  /// </summary>
  public static class DateTimeUtil
  {
    /// <summary>
    /// 时间戳计时开始时间
    /// </summary>
    private static DateTime timeStampStartTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
    /// <summary>
    /// DateTime转换为10位时间戳（单位：秒）
    /// </summary>
    /// <param name="dateTime"> DateTime</param>
    /// <returns>10位时间戳（单位：秒）</returns>
    public static long DateTimeToTimeStamp(DateTime dateTime)
    {
      return (long)(dateTime.ToUniversalTime() - timeStampStartTime).TotalSeconds;
    }
    /// <summary>
    /// DateTime转换为13位时间戳（单位：毫秒）
    /// </summary>
    /// <param name="dateTime"> DateTime</param>
    /// <returns>13位时间戳（单位：毫秒）</returns>
    public static long DateTimeToLongTimeStamp(DateTime dateTime)
    {
      return (long)(dateTime.ToUniversalTime() - timeStampStartTime).TotalMilliseconds;
    }
    /// <summary>
    /// 10位时间戳（单位：秒）转换为DateTime
    /// </summary>
    /// <param name="timeStamp">10位时间戳（单位：秒）</param>
    /// <returns>DateTime</returns>
    public static DateTime TimeStampToDateTime(long timeStamp)
    {
      return timeStampStartTime.AddSeconds(timeStamp).ToLocalTime();
    }
    /// <summary>
    /// 13位时间戳（单位：毫秒）转换为DateTime
    /// </summary>
    /// <param name="longTimeStamp">13位时间戳（单位：毫秒）</param>
    /// <returns>DateTime</returns>
    public static DateTime LongTimeStampToDateTime(long longTimeStamp)
    {
      return timeStampStartTime.AddMilliseconds(longTimeStamp).ToLocalTime();
    }
  }