time intervals

[Marco Alting]

Can anyone tell me how to write a routine that uses time-intervals, I would
like to dynamically create an array of times like this:

9:00
9:30
10:00
10:30

This has an interval of half an hour, but I want to be flexible for future
use, so a variable called interval should be set to define the intervals.

[Dr John Stockton]

Re: time intervals

JRS: In article <tOs0b.21482$X7 3.2866381@amsne ws02.chello.com >, seen in
news:comp.lang. javascript, Marco Alting <marco@alting-multimedia.nl>
posted at Tue, 19 Aug 2003 17:06:33 :-[color=blue]
>Can anyone tell me how to write a routine that uses time-intervals, I would
>like to dynamically create an array of times like this:
>
>9:00
>9:30
>10:00
>10:30
>
>This has an interval of half an hour, but I want to be flexible for future
>use, so a variable called interval should be set to define the intervals.[/color]


See reference in FAQ, and below.

Assuming that you do not need times between 23:59 and when-the-clocks-
go-back, you can use D = new Date("1/1/1 9:30") or with (D = new
Date()) setHours(9,30,0 ,0) or D = new Date(36000000-1800000) or
D = new Date(0,0,1,9,30 ,0) to initialise D ;
D.setMinutes(D. getMinutes()+30 ) to increment it; and pick out the
result with X = D.toGMTString() .match(/\d+:\d\d/).

OTOH, you could do it as you would with pencil and paper. Start with
HH=9 and MM=30, then
MM += interval ; HH += Math.floor(MM/60) ; MM %= 60

Incrementing by fractional minutes should now be obvious.

D.setTime(D.get Time()+1800000) // alternative.

Then assign the resulting strings to successive array elements,
remembering to add some way of stopping.

--
© 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.