Calculate date difference in YMD format "20081008"

Posted on 2008-10-30
Last Modified: 2012-05-05
On a submit page, I have 2 Select's - startdate, enddate.
Each holds a calculated value and allows the user to select a startdate and a enddate, submit the form and retrieve data.

Now I need to verify the form before submitting it, that startdate < enddate AND the difference between the dates are <= 4 weeks/31 days.

The function I've made so far is below - but I need osme help on how to verify the max. date difference.


function valiDates(){

		var maxtime = 60*60*24*31;

		var btn = document.getElementById("submit");

		var strSd = document.getElementById("startdate").value;

		var strEd = document.getElementById("enddate").value;

		var sd = new Date( strSd.substring(0,3) +"/"+ strSd.substring(4,5) +"/"+ strSd.substring(6,7) );

		var ed = new Date( strEd.substring(0,3) +"/"+ strEd.substring(4,5) +"/"+ strEd.substring(6,7) );

		if (sd > ed ){

			btn.disabled = true;

			btn.value = 'Slut dato skal være senere end start dato, max 4 uger statistik kan dannes !';

			document.getElementById("alert1").style.visibility = 'visible';

			} else {

			btn.disabled = false;

			btn.value = 'Hent data';

			document.getElementById("alert1").style.visibility = 'hidden';



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Question by:trg_dk

Accepted Solution

1eEurope earned 500 total points
Comment Utility
just add this at the bottom of your function and your good to go
//Set 1 day in milliseconds

var one_day=1000*60*60*24;

//Calculate difference btw the two dates, and convert to days

var dif = Math.ceil((ed.getTime()-sd.getTime())/one_day);

if(dif > 31) {

     btn.disabled = true;

     btn.value = '...!';

     document.getElementById("alert1").style.visibility = 'visible';


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Author Closing Comment

Comment Utility
YOU da' man :-)

Thanks for your quick solution - works perfectly !!!

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