C# utc datetime 互相转化

public double   ConvertDateTimeInt(System.DateTime time)
        {
            double   intResult = 0;
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            intResult =  (time - startTime).TotalSeconds ;
            return intResult;
        }
        public DateTime  ConvertIntDatetime(double   utc)
        {         
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            startTime = startTime.AddSeconds(utc);     
           startTime = startTime.AddHours(8);//转化为北京时间(北京时间=UTC时间+8小时 )
            return startTime;
        }
      

 

调用方法

 DateTime utcNow = DateTime.Now.ToUniversalTime();
 double utc= ConvertDateTimeInt(utcNow);
 DateTime dtime = ConvertIntDatetime(utc);