DateTime时间格式转换为Unix时间戳格式

 /// <summary>
/// 将DateTime时间格式转换为Unix时间戳格式
/// </summary>
/// <param name="dateTime">DateTime时间</param>
///  <param name="format">精度：Seconds-秒，Milliseconds-毫秒</param>
/// <returns></returns>
public static long ToUnixTimeStamp(this DateTime dateTime, string accuracy)
        {
long intResult = 0;
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
switch (accuracy)
            {
case "Seconds":
                    intResult = (long)(dateTime - startTime).TotalSeconds;
break;
case "Milliseconds":
                    intResult = (long)(dateTime - startTime).TotalMilliseconds;
break;
default:
                    intResult = (long)(dateTime - startTime).TotalSeconds;
break;
            }

return intResult;
        }