C#實現DateTime與Unix 時間戳（long）互轉

/// <summary>
/// 將 DateTime 轉換為 Unix 時間戳
/// </summary>
/// <param name="dateTime">需要轉換的時間</param>
/// <returns>Unix 時間戳</returns>
public static long DateTimeToUnixTime(DateTime dateTime)
{
    return (long)(dateTime - TimeZoneInfo.ConvertTime(new DateTime(1970, 1, 1, 0, 0, 0), TimeZoneInfo.Local)).TotalSeconds;
}

 

/// <summary>
/// 將 Unix 時間戳轉換為 DateTime
/// </summary>
/// <param name="timestamp">Unix 時間戳</param>
/// <returns>需要轉換的時間</returns>
public static DateTime UnixTimeToDateTime(long timestamp)
{
    if (timestamp < 0)
        throw new ArgumentOutOfRangeException("timestamp is out of range");

    return TimeZoneInfo.ConvertTime(new DateTime(1970, 1, 1, 0, 0, 0), TimeZoneInfo.Local).AddSeconds(timestamp);
}