时间戳与时间相互转换(php .net精确到毫秒)

/** 获取当前时间戳，精确到毫秒 */function microtime_float(){  list($usec, $sec) = explode(" ", microtime());  return ((float)$usec + (float)$sec);}/** 格式化时间戳，精确到毫秒，x代表毫秒 */function microtime_format($tag, $time){  list($usec, $sec) = explode(".", $time);  $date = date($tag,$usec);  return str_replace('x', $sec, $date);}

 /// <summary>     /// Unix时间戳转换为DateTime     /// </summary>     private DateTime ConvertToDateTime(string timestamp)     {       System.DateTime time = System.DateTime.MinValue;       //精确到毫秒       //时间戳转成时间       DateTime start = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , ));       try       {         time = timestamp.Length == ? start.AddSeconds(long.Parse(timestamp)) : start.AddMilliseconds(long.Parse(timestamp));       }       catch (Exception ex)       {         return start;//转换失败       }       return time;     }     /// <summary>     /// DateTime转换为Unix时间戳     /// </summary>     /// <param name="time"></param>     /// <returns></returns>     private string ConvertTimestamp(DateTime time)     {       double intResult = ;       System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , ));       intResult = (time - startTime).TotalMilliseconds;       return Math.Round(intResult,).ToString();     }