Re: Get Start Date of a Week Number

John,

Can you give me a date when week_iso should return 54?

Rob Berendt
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From: John Yeung <gallium.arsenide@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 12/01/2014 12:19 PM
Subject: Re: Get Start Date of a Week Number
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



On Mon, Dec 1, 2014 at 11:27 AM, Roger Harman <roger.harman@xxxxxxxxxxx>
wrote:

Fiscal weeks could be 52, 53, or even 54 (once every 28
years - 2000 was one of them). I remember having to
tweak things to deal with that 54 week year.

In my last post, I said I would recommend using the ISO definition, if
for no other reason than specifically to avoid the 54-week year. But
you bring up a good point, which is that sometimes it's not a choice
you can make.

Since I gave Rob a bit of grief for his 365.4 days, I'll be "fair" and
point out the nit here as well: The 54-week year happens *at most*
every 28 years. Across most century boundaries, occurrences are
separated by 40 years instead of 28 (because most century years are
NOT leap years; 2000 was an oddball because it's divisible by 400).
Using the week system which allows 54-week years, a 54-week year
occurs 13 times in every 400-year period.

John Y.
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