Can Java Script allow me to calculate a future date?

rohayre · Aug 13, 2006

Im a long time java developer and actually have never done anything
with java scripting. I'd like to write a short simple script for
calculating a date in the future based on today's date and a letter.
Can I use javascripting to create a webpage to allow a user to enter a
letter and then click a button to find a future calendar date? I'm just
not sure how much user interaction scripting allows. Does java
scripting allow buttons, textfields and the ability to put enough
smarts in to calculate a future date?

Georgi Naumov · Aug 13, 2006

(e-mail address removed) Ð½Ð°Ð¿Ð¸ÑÐ°:

Im a long time java developer and actually have never done anything
with java scripting. I'd like to write a short simple script for
calculating a date in the future based on today's date and a letter.

You can make this easily. See the reference for JavaScript Date object.
http://www.w3schools.com/jsref/jsref_obj_date.asp
This is smal example how to add one day to current date:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title></title>
<script type="text/javascript">
var today=new Date();
today.setDate(today.getDate()+1);
document.write("Tomorrow is:"+ today.toLocaleString());
</script>
</head>
<body>
</body>

Can I use javascripting to create a webpage to allow a user to enter a
letter and then click a button to find a future calendar date? I'm just
not sure how much user interaction scripting allows. Does java
scripting allow buttons, textfields and the ability to put enough
smarts in to calculate a future date?

Yes JavaScript is very usefull for this tasks. Tell me your idea and I
will help you with a
pleasure.
Best Regardss

Dr John Stockton · Aug 13, 2006

JRS: In article <[email protected]>
, dated Sun, 13 Aug 2006 01:00:36 remote, seen in

Im a long time java developer and actually have never done anything
with java scripting.

There is no space in "Javascript".

I'd like to write a short simple script for
calculating a date in the future based on today's date and a letter.
Can I use javascripting to create a webpage to allow a user to enter a
letter and then click a button to find a future calendar date?

Yes, and if you had read the newsgroup FAQ ... See sig.

I'm just
not sure how much user interaction scripting allows. Does java
scripting allow buttons, textfields and the ability to put enough
smarts in to calculate a future date?

See for example <URL:http://www.merlyn.demon.co.uk/js-clndr.htm>.

Javascript goes only up to AD 275760-09-13 with the built-in capability;
but can do up to about AD 3E12 if you code your own.

Dr John Stockton · Aug 13, 2006

JRS: In article <[email protected]>, dated
Sun, 13 Aug 2006 12:55:45 remote, seen in Jim

Davis said:
As far as adding to the current date (getting the future date) JavaScript's
Date object is very rich. There are "set" and "get" methods for all data
parts and several abstractions.

Actually, there is only one data part, an IEEE Double of milliseconds
from 1970.0 GMT. There are "get" methods for most derivable components
of conventional forms of the UTC/local date/time (but not Week Number,
although ISO 8601 defines it). For most of those, but not all, there is
a "set" method.

Dr John Stockton · Aug 14, 2006

JRS: In article <[email protected]>, dated
Mon, 14 Aug 2006 01:20:53 remote, seen in Jim

Davis said:
Sorry - typo. I meant "date part".

Although (since you got me thinking) "data part" is, I think, applicable -
not physically as in the memory storage of the implementation but rather (as
you imply) as information derivable from that implementation. It's
applicable since I was talking about the interface to the Date object rather
than the implementation.

...

There is a test, ISTM : The Date Object is required to behave as if it
stores just an IEEE Double of milliseconds from 1970.0 GMT, limit 10^8
days-worth; but it is neither required to store only that, not to store
exactly that.

Using only UTC functions, set a date from year, month, day and then read
out year, month, day in that order. We know that converting YMD to
milliseconds and milliseconds to YMD are tasks of similar complexity.
If setting YMD and reading Y take similar times but then reading M & D
is much faster, then there must be some sort of cache for M & D and
presumably Y; if each of the four take a similar time, then probably
only milliseconds are stored. That could be browser-dependent.

I've now put the code for function setDay in my js-date8.htm; also a
proposed method for setting the Week. Corresponding setUTC... functions
are then obvious. But function setTimezoneOffset is probably
impossible.

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Can Java Script allow me to calculate a future date?

rohayre

Georgi Naumov

Dr John Stockton

Dr John Stockton

Dr John Stockton

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