C#時間戳轉日期 互轉

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PubsLibrary
{

    /// 
  
    /// C#时间格式转换为时间戳（互转）  
    /// 时间戳定义为从格林威治时间 1970年01月01日00时00分00秒（北京时间1970年01月01日08时00分00秒）起至现在的总秒数。   
    ///   
    public class DateTime_TimeStamp 
    {
        protected int m_timestamp;

        /// 
  
        /// 获取时间戳Timestamp    
        ///   
        ///   
        ///   
        public static int GetTimeStamp(DateTime dt)
        {
            DateTime dateStart = new DateTime(1970, 1, 1, 8, 0, 0);
            int timeStamp = Convert.ToInt32((dt - dateStart).TotalSeconds);
            return timeStamp;
        }

        /// 
  
        /// 时间戳Timestamp转换成日期  
        ///   
        ///   
        ///   
        public static 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;
        }

        /// 
  
        /// 时间戳Timestamp转换成日期  
        ///   
        ///   
        ///   
        public static 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);
        }
    }  
}