| re: Date Interval Functions
JRS: In article <1d9192b3.0402160906.7d58b979@posting.google.com >, seen
in news:comp.lang.javascript, Lynn <runningwiththewolves@hotmail.com>
posted at Mon, 16 Feb 2004 09:06:17 :-[color=blue]
>On a form I have
>
>Date_Start Date_End
>
>I have a new
>Date_Start1 Date_End1 which the use
>inputs.
>
>I need to validate that Date_Start1 and Date_End1 are a date range
>entirely separate from Date_Start and Date_End i.e. no overlapping
>whatsoever. In effect checking a date interval.[/color]
Firstly validate the dates and convert them to Date Objects.
Check that Start < End and Start1 < End1.
Check that End < Start1 or End1 < Start.
That can be done by direct comparison of Objects.
If your dates are in the sensible International Standard form, then it
is not necessary to use Date Objects; just compare strings in YYYYMMDD
YYYY-MM-DD or YYYY/MM/DD forms.
If your dates are in numeric form without leading zero, e.g. 23/4/1564
or 23/4/1616, you can use a RegExp to remedy that.
If your dates lack, or may lack, the upper two digits of the year, you
can use a RegExp to remedy that.
If your dates are in a known non-standard order, you can use a RegExp to
remedy that.
[color=blue]
>Are there any functions out there already written that can do this? It
>seems to basic to start comparing and contracting dates! Would like to
>do it in Javascript, but happy in vbscript also.[/color]
See below.
--
© 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/vb-dates.htm> VB maths, dates, sources.
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