/// <summary>
        /// 獲取開停機的時間戳
        /// </summary>
        /// <param name="dtime"></param>
        /// <returns></returns>
        public int getTimeSpan(DateTime dtime)
        {
            //格林威治時間
            //var timeSpan_Greenwich = dtime - new DateTime(1970, 1, 1, 0, 0, 0);
            //標準北京時間
            var timeSpan = dtime - new DateTime(1970, 1, 1, 8, 0, 0);
            //或者這樣寫北京標準時間
            var timeSpan_beijing = dtime - TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1, 0, 0, 0));
           return (int)timeSpan.TotalSeconds;        }

/// <summary>  
        /// 時間戳Timestamp轉換成日期  
        /// </summary>  
        /// <param name="timeStamp"></param>  
        /// <returns></returns>  
        private DateTime GetDateTime(int timeStamp)
        {
            SaveCommand("timeStamp:" + timeStamp);

            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = ((long)timeStamp * 10000000);
            TimeSpan toNow = new TimeSpan(lTime);
            DateTime targetDt = dtStart.Add(toNow);

            if (string.IsNullOrEmpty(targetDt.ToString()))
            {
                targetDt = DateTime.Now;
            }

            SaveCommand("time:" + targetDt.ToString());

            return targetDt;
        }

</pre><pre name="code" class="csharp">using UnityEngine;  
using System.Collections;  
using System;  
  
/// <summary>  
/// C#時間格式轉換為時間戳（互轉）  
/// 時間戳定義為從格林威治時間 1970年01月01日00時00分00秒（北京時間1970年01月01日08時00分00秒）起至現(xiàn)在的總秒數(shù)。   
/// </summary>  
public class DateTime_TimeStamp : MonoBehaviour  
{  
    protected int m_timestamp;  
  
    /// <summary>  
    /// 獲取時間戳Timestamp    
    /// </summary>  
    /// <param name="dt"></param>  
    /// <returns></returns>  
    private int GetTimeStamp(DateTime dt)  
    {  
        DateTime dateStart = new DateTime(1970, 1, 1, 8, 0, 0);  
        int timeStamp = Convert.ToInt32((dt - dateStart).TotalSeconds);  
        return timeStamp;  
    }  
  
    /// <summary>  
    /// 時間戳Timestamp轉換成日期  
    /// </summary>  
    /// <param name="timeStamp"></param>  
    /// <returns></returns>  
    private DateTime GetDateTime(int timeStamp)  
    {  
        DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));  
        long lTime = ((long)timeStamp * 10000000);  
        TimeSpan toNow = new TimeSpan(lTime);  
        DateTime targetDt = dtStart.Add(toNow);  
        return targetDt;  
    }  
  
    /// <summary>  
    /// 時間戳Timestamp轉換成日期  
    /// </summary>  
    /// <param name="timeStamp"></param>  
    /// <returns></returns>  
    private DateTime GetDateTime(string timeStamp)  
    {  
        DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));  
        long lTime = long.Parse(timeStamp + "0000000");  
        TimeSpan toNow = new TimeSpan(lTime);  
        DateTime targetDt = dtStart.Add(toNow);  
        return dtStart.Add(toNow);  
    }  
  
    void OnGUI()  
    {  
        if (GUILayout.Button("獲取當前時間的時間戳"))  
        {  
            DateTime dtNow = DateTime.Now;  
            m_timestamp = GetTimeStamp(dtNow);  
            Debug.Log(string.Format("獲取當前時間的時間戳 = {0} -> {1}", dtNow.ToString("yyyy-MM-dd hh:mm:ss"), m_timestamp));  
        }  
  
        if (GUILayout.Button("將時間戳轉換成日期_1"))  
        {  
            DateTime dt = GetDateTime(m_timestamp);  
            Debug.Log(string.Format("將時間戳轉換成日期_1 = {0} -> {1}", m_timestamp, dt.ToString("yyyy-MM-dd hh:mm:ss")));  
        }  
  
        if (GUILayout.Button("將時間戳轉換成日期_2"))  
        {  
            DateTime dt = GetDateTime(m_timestamp.ToString());  
            Debug.Log(string.Format("將時間戳轉換成日期_2 = {0} -> {1}", m_timestamp, dt.ToString("yyyy-MM-dd hh:mm:ss")));  
        }  
    }  
}