1、当前时间转换为时间戳:

public static int ConvertDatetimeToInt(System.DateTime now) {    System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970,1,1));    return (int)(now - startTime).TotalSeconds;}

2、时间戳转换为当前时间：

public DateTime getDatetime(String timeStamp){   System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));   long lTime = long.Parse(timeStamp + "0000000");   TimeSpan toNow = new TimeSpan(lTime);   return startTime.Add(toNow); }