changing date format

[Chris]

Hello,

i'm using a form with 2 dates in the format mm/dd/yyyy in it. I wanna
calculate the days between the two dates.
I tried it like this:

<script language="JavaS cript">
var date1 = new date("10/22/2003");
var date2 = new date("10/25/2003");
var diff = date2.gettime() - date1.gettime() ;
</script>

only it seems that the date format like this won't work is there anything i
can do to convert the format or convience it to use the date like that?

Thanks for the help
chris

[Thomas 'PointedEars' Lahn]

Re: changing date format

Chris wrote:
[color=blue]
> i'm using a form with 2 dates in the format mm/dd/yyyy in it. I wanna
> calculate the days between the two dates. I tried it like this:
>
> <script language="JavaS cript">[/color]

That's invalid HTML 4, the `type' attribute is missing:

http://validator.w3.org/
[color=blue]
> var date1 = new date("10/22/2003"); var date2 = new date("10/25/2003");[/color]

This won't work anyway or if it does, it works most certainly only for you:
JavaScript is case-sensitive, the constructor function for Date objects is
Date(...), not date(...).
[color=blue]
> var diff = date2.gettime() - date1.gettime() ;
> </script>
>
> only it seems that the date format like this won't work[/color]

Of course not, see

http://devedge.netscape.com/library/manuals/2000/javascript/1.5/reference/date.html#1193137

[color=blue]
> is there anything i can do to convert the format or convience it to use
> the date like that?[/color]

See the discussion with the subject `Date datatype' one week ago.


PointedEars

[Dr John Stockton]

Re: changing date format

JRS: In article <vpc9a692abn805 @corp.supernews .com>, seen in
news:comp.lang. javascript, Chris <cmohn@gmx.de > posted at Wed, 22 Oct
2003 02:35:49 :-
[color=blue]
>i'm using a form with 2 dates in the format mm/dd/yyyy in it. I wanna
>calculate the days between the two dates.[/color]
[color=blue]
>var date1 = new date("10/22/2003");
>var date2 = new date("10/25/2003");
>var diff = date2.gettime() - date1.gettime() ;[/color]


Date differencing is covered in <URL:http://www.merlyn.demon.co.uk/js-
date2.htm>; read the rest of the Javascript material there too.

The 'word' "wanna" is not good English; if you can, please use proper
English, out of courtesy to those who are trying to learn it. Much the
same goes for "i'm"; case is important in proper English, as it is for
Javascript. For example, "new Date(...)".

You seem to be German; you should not therefore want to give dates in
DDF. While (AIUI) currently most browsers interpret 10/22/2002 as Oct
22, 2003, one should not rely on that, since it can readily be avoided
by using the proper form "2003/10/22" with ISO-8601 field order, or by
using "2003 Oct 22". I have not heard of any browser that does not
accept those. Note that while 04/07/2003 will be interpreted as April
7th by present browsers, a European reader may think that it means 4th
July.

Method gettime does not exist; getTime() returns milliseconds. The
number of milliseconds in a Javascript day is not always 864E5; you
should test for, say the cases of 2003/03/31 - 2003/03/28 and 2003/10/27
- 2003/10/24 (still assuming that you are in the EU).

Just date2 - date1 would suffice.

If the input is from a user, then you should consider validating the
dates. Code like you give would accept "13/13/2003" as meaning
2004-01-13.

--
© 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.demo n.co.uk/js-index.htm> JS maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/JS/&c., FAQ topics, links.