countdown script problem (months remaining occasionally incorrect)

[Joseph S]

I am having problems with the following countdown script. For some reason,
the number of months is occasionally wrong. I can't quite put my finger on
the problem. Any assistance or recommendation from someone more knowlegable
than me would be appreciated. Thanks much.

<script>
ty=2005;to=08;td=31;th=24;tm=0;ts=0;
function e(){
ny=0;no=0;nd=0;nh=0;nm=0;ns=0;n=new Date();

if(n.getYear()>ty){t.s.value=0;t.m.value=0;t.h.val ue=0;t.d.value=0;t.o.value
=0;t.y.value=0;}
else{
ns=ns+ts-n.getSeconds();if(ns<0){ns=60+ns;nm=-1;}t.s.value=ns;
nm=nm+tm-n.getMinutes();if(nm<0){nm=60+nm;nh=-1;}t.m.value=nm;
nh=nh+th-n.getHours();if(nh<0){nh=24+nh;nd=-1;}t.h.value=nh;
nd=nd+td-n.getDate();if(nd<0){
x=n.getMonth();
if(x==0||x==2||x==4||x==6||x==7||x==9||x==11){nd=3 1+nd;}
if(x==3||x==5||x==8||x==10){nd=30+nd;}

if(x==1){if(n.getYear()/4-Math.floor(n.getYear()/4)==0){nd=29+nd;}else{nd=28
+nd;}}
}no=-1;t.d.value=nd;
no=no+to-n.getMonth();if(no<0){no=11+no;ny=-1;}t.o.value=no;

ny=ny+ty-n.getYear();if(ny<0){t.y.value=0;}else{t.y.value=n y;setTimeout("e()
",1000);}
}
}
</script>

Example:

http://members.cox.net/icystorm/retire

---------------
Joseph
ic************@hotnospammail.com

(Please remove both occurrences of "nospam" to reply via email, or simply
reply here in USENET instead.)

[Lasse Reichstein Nielsen]

"Joseph S" <no****@nospam.org> writes:

I am having problems with the following countdown script. For some reason,
the number of months is occasionally wrong. I can't quite put my finger on
the problem. Any assistance or recommendation from someone more knowlegable
than me would be appreciated. Thanks much.
Measuring difference in time in months is not well defined.
How many months and days are there between
2004-02-29 and 2004-05-31 (92 days)
or between
2004-03-01 and 2004-06-01 (also 92 days)
or even
2004-01-29 and 2004-02-29 (29 days)
and
2004-01-30 and 2004-03-01 (also 29 days)

If you can answer this in a way that you are satisfied with ... does your
program agree with you?
<script>

It's <script type="text/javascript">. The type attribute is required
in HTML 4.

/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html>
'Faith without judgement merely degrades the spirit divine.'

[Dr John Stockton]

JRS: In article <e2_Pb.12721$zy3.2450@okepread01>, seen in
news:comp.lang.javascript, Joseph S <no****@nospam.org> posted at Thu,
22 Jan 2004 18:37:49 :-

I am having problems with the following countdown script. For some reason,
the number of months is occasionally wrong. I can't quite put my finger on
the problem.

The code does what you have programmed it to do, but it is badly written
and your intent is concealed.

Obviously, though, you are not making effective use of the properties of
a date object. See sig at foot.

You have n.getYear()/4-Math.floor(n.getYear()/4)==0
which should probably be n.getYear()%4 == 0 except that you have no
need for that part of the code at all.
If this is course-work requiting you to use inefficient techniques in
order to exercise your programming skill, then you should say so.

If you have found the approach recommended in a book, except as above,
burn the book.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4 ©
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

[Joseph S]

"Dr John Stockton" <sp**@merlyn.demon.co.uk> wrote:

news:comp.lang.javascript, Joseph S <no****@nospam.org> posted at Thu,
22 Jan 2004 18:37:49 :-

I am having problems with the following countdown script. For some reason,the number of months is occasionally wrong. I can't quite put my finger onthe problem.
The code does what you have programmed it to do, but it is badly written
and your intent is concealed.

Obviously, though, you are not making effective use of the properties of
a date object. See sig at foot.

You have n.getYear()/4-Math.floor(n.getYear()/4)==0
which should probably be n.getYear()%4 == 0 except that you have no
need for that part of the code at all.
If this is course-work requiting you to use inefficient techniques in
order to exercise your programming skill, then you should say so.

Nah. I'm just wasn't sure what I was doing. That's why I posted.
If you have found the approach recommended in a book, except as above,
burn the book.

Thanks for the free advice.

Joseph