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Re: Commercial Concalendar

From:Mark J. Reed <markjreed@...>
Date:Monday, September 27, 2004, 20:07
On Mon, Sep 27, 2004 at 03:31:16PM -0400, Jeffrey Henning wrote:
> Alas, when we customized our software for them, they neglected to inform us > that every four years they need to insert a leap week: Week 1E! Otherwise > their project year gets out of sync with their fiscal year. So we need to > modify our validation to handle this leap week.
Are you sure it's every four years? A leap week every four years is too often; to keep in synch with the tropical year leap weeks need to happen between 5 and 6 years apart. I would guess that under the covers they are using the ISO calendar, which just numbers the weeks 1-52 or 53 without breaking it up into any sort of "month". The leap-week schedule is somewhat uneven because it's actually based on the Gregorian calendar: week 1 is always the first week that contains at least 4 days in January (no more than 3 in December). There is a leap year (a year with a "week 53") whenever there are 53 instead of 52 weeks between consecutive "week 1"s. -Marcos