Javascript Add Date Problem

Question

I've this snippet:

var d1 = parseInt( document.getElementById('day1').value );
var m1 = parseInt( document.getElementById('month1').value );
var y1 = parseInt( document.getElementById('year1').value );

var dt = new Date();
dt.setYear(y1);
dt.setMonth(m1);
dt.setDate(d1 + 1);

document.getElementById('day2').value = dt.getDate();
document.getElementById('month2').value = dt.getMonth();
document.getElementById('year2').value = dt.getYear();

My goal is, to automatically init value of date2 by adding 1 day from date1. However, when I fill :

 day1 = 32
 month1 = 1
 year1 = 2009

I got :

 day1 = 5
 month1 = 2
 year1 = 2009

I don't know what is going on. Do you guys know the solutions?

Community · Accepted Answer · 2017-05-23 12:01:12Z

2

The JavaScript Date object handles months as zero-based numbers (0-Jan,1-Feb,...,11-Dec).

Also you can have problems with the set methods, I would recommend you to use the Date constructor:

var d1 = +document.getElementById('day1').value;
var m1 = +document.getElementById('month1').value - 1; // zero based!!
var y1 = +document.getElementById('year1').value;

var dt = new Date(y1, m1, d1);

edited May 23, 2017 at 12:01

CommunityBot

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answered Dec 3, 2009 at 6:36

Christian C. Salvadó

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1 Comment

ariefbayu Over a year ago

can you tell me more, what problem would that be?

rdivilbiss · Accepted Answer · 2009-12-05 23:51:25Z

1

See The Add Days To A JavaScript Date example.

answered Dec 5, 2009 at 23:51

rdivilbiss

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1 Comment

CleverPatrick Over a year ago

Sadly this does not work. It does not account correctly for days which are longer or shorter than 24 hours (the leap year days). For example, on the script at this site, try this date: 7/11/2010 (November, 7 2010) while in the eastern time zone.

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