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Adding months to entered date

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Apr 18.2011

Hi,
I’m getting a little lost here. I need to add 18 months to a date entered on a form and show the results to the user without the time. so a date like 1/1/2000 is entered and the results should be 06/30/2001. I am parsing the string and adding 18 months of milliseconds to the date. While I have gotten this to work, it is not correct because each month has a different # of days.

Can anyone show me an easier way to add 18 months to a date entered by a user?

Thanks.

[CODE]
var str = document.form1.startdate.value;
var d1 = Date.parse(document.form1.startdate.value);
var d7 = d1+86400000*30*18;

var lm = new Date(d7);
var dt = lm.getDate();
var mm = lm.getMonth()+1;
var yy = lm.getFullYear();
var lmDate = mm + “-” + dt + “-” + yy;

document.getElementById(‘results1’).innerHTML = lmDate;

[/CODE]

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JavaScript

4 Comments(s) ↴

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@mrhooApr 18.2011 — // I would consider 18 months added to January 1 to be July 1 of the next year, not June 30.
[CODE]
function plus18months(d){
var d2= new Date(d);
d2.setMonth(d2.getMonth()+18);
return d2;
}

var d=new Date(2000,0,1);

alert(plus18months(d).toLocaleDateString())[/CODE]

/* returned value: Sunday, July 01, 2001 */
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@coldfire421Apr 18.2011 — Try this...

[code=html]
<html>
<head>
<title>JavaScript Test</title>
<script type="text/javascript">
function init(){
var monthName = new Array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
var tmpDate = new Date();
var dateAfterEighteenMonths = null;

dateAfterEighteenMonths = tmpDate.getMonth() + 18;
if(dateAfterEighteenMonths > 11)
dateAfterEighteenMonths -= 12;

alert("Today is " + monthName[tmpDate.getMonth()] + ", 18 months from now its gonna be " + monthName[dateAfterEighteenMonths]);
}
window.onload = init;
</script>
</head>
<body>
</body>
</html>
[/code]
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@paulyauthorApr 18.2011 — While that is a nice idea, it is missing the day and year.

My results need to have the day, month and year.
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@paulyauthorApr 18.2011 — I've got it now.

var dz=new Date(document.form1.startdate.value);

Thanks mrhoo
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