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Bug with object Date 1

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majg2002

majg2002

Programmer
Jul 11, 2000
8
0
0
ES
Look October
---------------

Award who fix the bug!!!!!!!!!!!!!!!!!!!!

This is the code. It's short, but difficult

Run it and change to October.


<html>

<head>
<title>Días de un mes</title>
<script>
var msPerDay = 24*60*60*1000; // Miliseconds 1 día (=86400000 ms);
function WriteDays()
{
yyyy=document.frm.year.options[document.frm.year.selectedIndex].value;
mm=document.frm.moth.options[document.frm.moth.selectedIndex].value;
var initialDate = new Date(yyyy,mm,1);
var contenido=&quot;&quot;;
var i=0;
while (mm==initialDate.getMonth())
{
i++;
contenido+= i + &quot;.&quot; + initialDate.toString() + &quot;<br>&quot;;
initialDate.setTime(initialDate.getTime() + msPerDay);
}
if (document.all)
{
document.all[&quot;capa&quot;].innerHTML=contenido;
}
else
{
document.layers[&quot;capa&quot;].document.open()
document.layers[&quot;capa&quot;].document.write(contenido)
document.layers[&quot;capa&quot;].document.close()
}
}
</script>
</head>

<body>
<form name=&quot;frm&quot;>
<table>
<tr>
<td>Year</td>
<td>
<select name=&quot;year&quot; onchange=&quot;WriteDays();&quot;>
<option value=&quot;2002&quot;>2002
<option value=&quot;2003&quot;>2003
<option value=&quot;2004&quot;>2004
<option value=&quot;2005&quot;>2005
<option value=&quot;2006&quot;>2006
<option value=&quot;2007&quot;>2007
</select>
</td>
</tr>
<tr>
<td>Month</td>
<td>
<select name=&quot;moth&quot; onchange=&quot;WriteDays();&quot;>
<option value=&quot;0&quot;>January
<option value=&quot;1&quot;>February
<option value=&quot;2&quot;>March
<option value=&quot;3&quot;>April
<option value=&quot;4&quot;>May
<option value=&quot;5&quot;>June
<option value=&quot;6&quot;>July
<option value=&quot;7&quot;>August
<option value=&quot;8&quot;>September
<option value=&quot;9&quot;>October
<option value=&quot;10&quot;>November
<option value=&quot;11&quot;>December
</select>
</td>
</tr>
</table>
</form>
<div id=&quot;capa&quot; style=&quot;position:absolute;left:225px; top:10px;height:10px; width:300px;&quot;>
</div>
</body>

</html>
 
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How screwy! [shocked] You think that the js developers would have caught that one. Anyway, without knowing why you are using [tt]setTime()[/tt], here's one possible answer (changes to [tt]WriteDays()[/tt] in bold)

[tt]var i=1;
while (mm==initialDate.getMonth())
{
contenido+= i + &quot;.&quot; + initialDate.toString() + &quot;<br>&quot;;
i++;
initialDate.setDate(i);
}[/tt] Paul Ellis
[hammer] I've been programming since you had to punch holes in cards to code. (Always remember, number your cards!)
 
Upvote 0 Downvote

I already had several solutions. I didn't need a alternative algorithm, but to understand why the last Sunday of October is repeated when adding 86400000 ms (= 1 day) to the date with setTime() method.

It's due to 'Daylight Savings Time' of my Time Zone.

Really there isn't any bug, SORRY, the next example explains why the day is repeated:

Example
-------

........

(Fri Oct 25 00:00:00 UTC+0200 2002) + 86400000ms = Sat Oct 26 00:00:00 UTC+0200 2002. Day 26.

(Sat Oct 26 00:00:00 UTC+0200 2002) + 86400000ms = Sun Oct 27 00:00:00 UTC+0200 2002. Day 27.

(Sun Oct 27 00:00:00 UTC+0200 2002) + 86400000ms = Sun Oct 27 23:00:00 UTC+0100 2002. Day 27 (Daylight Savings Time applied and the day is repeated).

(Sun Oct 27 23:00:00 UTC+0100 2002)) + 86400000ms = Mon Oct 28 23:00:00 UTC+0100 2002. Day 28.

........





 
Upvote 0 Downvote
another attack of the day light savings bug I may not get it the 1st or 2nd time,
but how sweet that 15th time can be.
 
Upvote 0 Downvote
Why is it that the simplest solutions are always the last considered?

Does this effect happen when you &quot;spring forward&quot;, too? Paul Ellis
[hammer] I've been programming since you had to punch holes in cards to code. (Always remember, number your cards!)
 
Upvote 0 Downvote
Yes it does. I remember when April came around a lot of people where complaining about their scripts not working correctly. I may not get it the 1st or 2nd time,
but how sweet that 15th time can be.
 
Upvote 0 Downvote
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