NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part1/415

Internet Message Format | 1996-08-05 | 1.7 KB

Path: mail2news.demon.co.uk!genesis.demon.co.uk
From: Lawrence Kirby <[e-mail]>
Newsgroups: comp.lang.c
Subject: Re: time/date algorithms
Date: Fri, 05 Jan 96 02:23:43 GMT
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In article <[e-mail]>
           [e-mail] "Mark Thomas" writes:

>A co-worker of mine is looking for an algorithm what
>works something like this:  given a week number 1-52
>(or 0-51 I suppose) and a year, the month and day of the
>sunday in that week is output.  He swears he's seen
>it in a book, and doesn't want to have to re-create it.

First you have to define what you mean by a week number. There are many
definitions to choose from. For example there are 2 defined by the ANSI
strftime %U and %W conversion specifiers, there are ISO 8601 week numbers
and there might also be simpler definitions such at the first 7 days of
the year being in week 1, and so on. It is probably simplest if your
co-worker defines what he understands by week number.

Incidentally 52 weeks only accounts for 364 days so there are more than 52
weeks in a year.

>Anyone have this [bizarre] algorithm laying around somewhere,
>or know where it can be found?  Please reply by email
>if you do -- thanks alot.

No I don't! :-) However it should be very easy to write once we know
what precisely your co-worker needs.

--
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Lawrence Kirby | [e-mail]
Wilts, England | [e-mail]
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