Naar datum aftellen

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<script type="text/javascript">
var today=new Date()

//Invullen van de  datum van het evenement. MAAND (1-12) en DAGEN (1-31) - staat nu op 4 , 1 = 1 april
var theoccasion=new Date(today.getFullYear(), 4, 1)

//Hier kan je aanpassingen aanbregen:
var beforeOccasionText="tot 1 april"
var onOccasiontext="Vandaag is het zover!"

var monthtext=new Array("Januari","Februari","Maart","April","Mei","Juni","Juli","Augustus","September","Oktober","November","December")
theoccasion.setMonth(theoccasion.getMonth()-1) //change to 0-11 month format
var showdate="("+monthtext[theoccasion.getMonth()]+" "+theoccasion.getDate()+")" //toon datum van het evenement

var one_day=1000*60*60*24
var calculatediff=""

calculatediff=Math.ceil((theoccasion.getTime()-today.getTime())/(one_day))
if (calculatediff<0){ //if bday already passed
var nextyeartoday=new Date()
nextyeartoday.setFullYear(today.getFullYear()+1)
calculatediff=Math.ceil((nextyeartoday.getTime()-today.getTime())/(one_day)+calculatediff)
}

//Display message accordingly
var pluraldayornot=(calculatediff==1)? "dag" : "dagen"
if (calculatediff>0)
	document.write("<b>Nog "+calculatediff+" "+pluraldayornot+" "+beforeOccasionText+"</b>")
else if (calculatediff==0)
	document.write("<b>Nog "+onOccasiontext+"</b>")
</script>

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<html>
<head>
	<title> Pagina </title>
	<script type="text/javascript">
		function startTime()
		{
			var datum = new Date(2010, 03, 01, 12, 00, 00, 00);

			var huidigedatum = new Date();

			var verschil = new Date(datum.getTime() - huidigedatum.getTime());


			tijdsverschil = verschil.getTime();

			var week = Math.floor(tijdsverschil / (1000 * 60 * 60 * 24 * 7));
			tijdsverschil -= week * (1000 * 60 * 60 * 24 * 7);

			var dag = Math.floor(tijdsverschil / (1000 * 60 * 60 * 24)); 
			tijdsverschil -= dag * (1000 * 60 * 60 * 24);

			var uur = Math.floor(tijdsverschil / (1000 * 60 * 60));
			tijdsverschil -= uur * (1000 * 60 * 60);

			var minuut = Math.floor(tijdsverschil / (1000 * 60)); 
			tijdsverschil -= minuut * (1000 * 60);

			var seconde = Math.floor(tijdsverschil / 1000); 
			tijdsverschil -= seconde * 1000;

			document.getElementById('klok').innerHTML = "Nog " + week + " weken " + dag + " dagen " + uur + " uren " + minuut + " minuten " + 

seconde + " seconden tot " + datum.toLocaleDateString() + " " + datum.toLocaleTimeString();
			t=setTimeout('startTime()',500);
		}

	</script> 
</head>
<body onload="startTime()">
	<div id="klok"></div>
</body>
</html>

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<body onload="startTime()">
	<div id="klok"></div>
</body>

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var datum = new Date(2010, 03, 01, 12, 00, 00, 00);

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setcountdown(2010,4,1,17,00,00);

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<script type="text/javascript">

function setcountdown(theyear,themonth,theday,thehour,themin,thesec)
{
	yr=theyear;mo=themonth;da=theday;hr=thehour;min=themin;sec=thesec;
}

//////////Bewerk  het aftelscript hier//////////////////

//STEP 1: verander hier het aftel - script, in het formaat  jaar, maand, dag, uur(0=middernacht,23=11pm), minuten, seconden:
setcountdown(2010,4,1,17,00,00);

//STEP 2: verander hieronder de tekst die na het aftellen moet komen, en de boodschap op de dag van het tijdstip, respectively
var occasion="<div style=font-size:20px;>Zettingen beginnen over</div><br />";
var message_on_occasion="Zettingen zijn reeds voorbij";

//STEP 3: verander de 5 variabelen hieronder , te weten  de width (= breedte), height (= hoogte), background color (= achtergrondkleur), en tekst style van de countdown area
var countdownwidth='400px';
var countdownheight='35px';
var countdownbgcolor='yellow';
var opentags='<div style="font-family:Verdana; font-size:16px; color:black; text-align:center">';
var closetags='</div>';

//////////verander hieronder niets//////////////////

var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
var crosscount='';

function start_countdown()
{
	if (document.layers)
		document.countdownnsmain.visibility="show";
	else
		if (document.all||document.getElementById)
			crosscount=document.getElementById&&!document.all?document.getElementById("countdownie") : countdownie;
			countdown();
}

if (document.all||document.getElementById)
	document.write('<span id="countdownie" style="width:'+countdownwidth+'; background-color:'+countdownbgcolor+'"></span>');

window.onload=start_countdown;


function countdown()
{
	var today=new Date();
	var todayy=today.getYear();
	if (todayy < 1000)
		todayy+=1900;
	var todaym=today.getMonth();
	var todayd=today.getDate();
	var todayh=today.getHours();
	var todaymin=today.getMinutes();
	var todaysec=today.getSeconds();
	var todaystring=montharray[todaym]+" "+todayd+", "+todayy+" "+todayh+":"+todaymin+":"+todaysec;
	futurestring=montharray[mo-1]+" "+da+", "+yr+" "+hr+":"+min+":"+sec;
	dd=Date.parse(futurestring)-Date.parse(todaystring);
	dday=Math.floor(dd/(60*60*1000*24)*1);
	dhour=Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1);
	dmin=Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
	dsec=Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);
		//if on day of occasion
	if(dday<=0&&dhour<=0&&dmin<=0&&dsec<=1&&todayd==da)
	{
		if (document.layers)
		{
			document.countdownnsmain.document.countdownnssub.document.write(opentags+message_on_occasion+closetags);
			document.countdownnsmain.document.countdownnssub.document.close();
		}
		else
			if (document.all||document.getElementById)
				crosscount.innerHTML=opentags+message_on_occasion+closetags;
		return;
	}
		//if passed day of occasion
	else
		if(dday<=-1)
		{
			if (document.layers)
			{
				document.countdownnsmain.document.countdownnssub.document.write(opentags+"Zettingen zijn reeds voorbij! "+closetags);
				document.countdownnsmain.document.countdownnssub.document.close();
			}
			else if (document.all||document.getElementById)
				crosscount.innerHTML=opentags+"Zettingen zijn reeds voorbij! "+closetags;
			return;
		}
			//else, if not yet
		else
		{
			if(document.layers)
			{
				document.countdownnsmain.document.countdownnssub.document.write(opentags+occasion+dday+ " dagen, "+dhours+" uren, "+dmin+" minuten, en "+dsec+" seconden tot "+closetags);
				document.countdownnsmain.document.countdownnssub.document.close();
			}
			else if (document.all||document.getElementById)
				crosscount.innerHTML=opentags+occasion+dday+ " dagen, "+dhour+" uren, "+dmin+" minuten, "+dsec+" seconden "+closetags;
		}
		setTimeout("countdown()",1000);
}
</script>

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var today=new Date(); 
   var todayy=today.getYear(); 
   if (todayy < 1000) 
      todayy+=1900; 
   var todaym=today.getMonth(); 
   var todayd=today.getDate(); 
   var todayh=today.getHours(); 
   var todaymin=today.getMinutes(); 
   var todaysec=today.getSeconds(); 
   var todaystring=montharray[todaym]+" "+todayd+", "+todayy+" "+todayh+":"+todaymin+":"+todaysec; 
   futurestring=montharray[mo-1]+" "+da+", "+yr+" "+hr+":"+min+":"+sec; 
   dd=Date.parse(futurestring)-Date.parse(todaystring);

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var today = new Date(); 

futurestring.setMonth(futurestring.getMonth-1); 

dd = futurestring.getTime() - today.getTime();

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...
...
function countdown() 
{ 
var today = new Date(); 
futurestring.setMonth(futurestring.getMonth-1); 
dd = futurestring.getTime() - today.getTime();

   dday = Math.floor(dd/(60*60*1000*24)*1); 
   dhour = Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1); 
   dmin = Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1); 
   dsec = Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1); 
      //if on day of occasion 
   if(dday<=0 && dhour<=0 && dmin<=0 && dsec<=1 && today.getDate()==da) 
   { 
...
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