Girilen tarihe göre geri sayım sayacı

Merhaba,

İnternet sitesine HTML kodları ile ekleyebileceğim basit bir geri sayım sayacı kodu paylaşabilir misiniz?
Mesela 30 Haziran 2025 tarihini girdiğimizi varsayıp ona göre çalışan bir geri sayım sayacı.

Yardım edene şimdiden teşekkürler.

<style style="text/css">
.lcdstyle{ /*Example CSS to create LCD countdown look*/ background-color:black; color:yellow; font: bold 18px MS Sans Serif; padding: 3px; }
.lcdstyle sup{ /*Example CSS to create LCD countdown look*/ font-size: 80% }
</style>
<script type="text/javascript">
/*********************************************** * Dynamic Countdown script- © Dynamic Drive (http://www.dynamicdrive.com) * This notice MUST stay intact for legal use * Visit http://www.dynamicdrive.com/ for this script and 100s more. ***********************************************/
function cdtime(container, targetdate){ if (!document.getElementById || !document.getElementById(container)) return this.container=document.getElementById(container) this.currentTime=new Date() this.targetdate=new Date(targetdate) this.timesup=false this.updateTime() }
cdtime.prototype.updateTime=function(){ var thisobj=this this.currentTime.setSeconds(this.currentTime.getSeconds()+1) setTimeout(function(){thisobj.updateTime()}, 1000) //update time every second }
cdtime.prototype.displaycountdown=function(baseunit, functionref){ this.baseunit=baseunit this.formatresults=functionref this.showresults() }
cdtime.prototype.showresults=function(){ var thisobj=this

var timediff=(this.targetdate-this.currentTime)/1000 //difference btw target date and current date, in seconds if (timediff<0){ //if time is up this.timesup=true this.container.innerHTML=this.formatresults() return }
var oneMinute=60 //minute unit in seconds var oneHour=60*60 //hour unit in seconds var oneDay=60*60*24 //day unit in seconds var dayfield=Math.floor(timediff/oneDay) var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour) var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute) var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute)) if (this.baseunit=="hours"){ //if base unit is hours, set "hourfield" to be topmost level hourfield=dayfield*24+hourfield dayfield="n/a" }
else if (this.baseunit=="minutes"){ //if base unit is minutes, set "minutefield" to be topmost level minutefield=dayfield*24*60+hourfield*60+minutefield dayfield=hourfield="n/a" }
else if (this.baseunit=="seconds"){ //if base unit is seconds, set "secondfield" to be topmost level var secondfield=timediff dayfield=hourfield=minutefield="n/a" }
this.container.innerHTML=this.formatresults(dayfield, hourfield, minutefield, secondfield) setTimeout(function(){thisobj.showresults()}, 1000) //update results every second }
/////CUSTOM FORMAT OUTPUT FUNCTIONS BELOW//////////////////////////////
//Create your own custom format function to pass into cdtime.displaycountdown() //Use arguments[0] to access "Days" left //Use arguments[1] to access "Hours" left //Use arguments[2] to access "Minutes" left //Use arguments[3] to access "Seconds" left
//The values of these arguments may change depending on the "baseunit" parameter of cdtime.displaycountdown() //For example, if "baseunit" is set to "hours", arguments[0] becomes meaningless and contains "n/a" //For example, if "baseunit" is set to "minutes", arguments[0] and arguments[1] become meaningless etc

function formatresults(){ if (this.timesup==false){//if target date/time not yet met var displaystring=arguments[0]+" days "+arguments[1]+" hours "+arguments[2]+" minutes "+arguments[3]+" seconds left until March 23, 2009 18:25:00" }
else{ //else if target date/time met var displaystring="Future date is here!" }
return displaystring }
function formatresults2(){ if (this.timesup==false){ //if target date/time not yet met var displaystring="<span class='lcdstyle'>"+arguments[0]+" <sup>days</sup> "+arguments[1]+" <sup>hours</sup> "+arguments[2]+" <sup>minutes</sup> "+arguments[3]+" <sup>seconds</sup></span> left until this Christmas" }
else{ //else if target date/time met var displaystring="" //Don't display any text alert("Christmas is here!") //Instead, perform a custom alert }
return displaystring }
</script>
<div id="countdowncontainer"></div> <br /> <div id="countdowncontainer2"></div>
<script type="text/javascript">
var futuredate=new cdtime("countdowncontainer", "March 23, 2009 18:25:00") futuredate.displaycountdown("days", formatresults)
var currentyear=new Date().getFullYear() //dynamically get this Christmas' year value. If Christmas already passed, then year=current year+1 var thischristmasyear=(new Date().getMonth()>=11 && new Date().getDate()>25)? currentyear+1 : currentyear var christmas=new cdtime("countdowncontainer2", "December 25, "+thischristmasyear+" 0:0:00") christmas.displaycountdown("days", formatresults2)
</script>

https://codepen.io/tag3r/pen/wYKwRq

Yukarıdaki bağlantıda oldukça basit bir versiyonunu bulabilirsiniz

Not: bunu sadece html ile yapmak mümkün değil bildiğim kadarıyla.