Methods to implement flash sale countdown with C# combined with JavaScript

private string Dtime() 
{ 
 byte tempB = (byte); 
 byte dayByte = (byte); 
 DateTime wednesdayNow = (dayByte - tempB);
 //This Wednesday DateTime returnTime = new DateTime (); 
 if ( < ) 
 { 
  //The current week is less than this Wednesday Get this Wednesday  returnTime = new DateTime(,,,10,0,0);
 } 
 else 
 { 
  //The current week is greater than this Wednesday Get next Wednesday  DateTime nextWednesday = (7);//Next Wednesday  returnTime = new DateTime(,,,10,0,0);
 } 
 return () 
}

$(document).ready(function() {
 $('body').everyTime('1s', function() {
 var nowDate = new Date();
 var endDate = new Date($("#sp_next").html().replace(//-/g, "//"));
 //This time is the time returned by the previous method var timeold = () - ();
 var sectimeold = timeold / 1000
 var secondsold = (sectimeold);
 var msPerDay = 24 * 60 * 60 * 1000
 var e_daysold = timeold / msPerDay
 var daysold = (e_daysold);
 var e_hrsold = (e_daysold - daysold) * 24 + (daysold * 24);
 var hrsold = (e_hrsold);
 var e_minsold = (e_hrsold - hrsold) * 60;
 var minsold = ((e_hrsold - hrsold) * 60);
 var seconds = ((e_minsold - minsold) * 60);
 if (hrsold > 0 && hrsold < 10) { hrsold = "0" + hrsold; }
 if (minsold < 10) { minsold = "0" + minsold; }
 if (seconds < 10) { seconds = "0" + seconds; }
 if (hrsold < 0) {
  $(".seckill_time").html("0");
  $(".seckill_minute").html("0");
  $(".seckill_second").html("0");
 } else {
  $(".seckill_time").html("").html(hrsold);
  $(".seckill_minute").html("").html(minsold);
  $(".seckill_second").html("").html(seconds);
 }
 });
});