The most challenging date math we've faced recently (a real project) is the
ISO 8601 week calculation.  Extremely easy to introduce an off-by-one error!

On Sat, Dec 14, 2013 at 11:13 AM, Wols Lists <>wrote:

> On 14/12/13 16:48, Dan Fitzgerald wrote:
> > Kevin: I'd take the month (verifying; gigo), then run it through a case
> statement to determine the number of days in that month (sounds like a
> handy subroutine to have in the toolbox). Then I'd convert to get the day
> of the week, another case statement to get the number of days past
> Thursday, do the math from the last DOM internal date, oconv the result,
> and grab a cup of dark roast. There are probably more efficient ways, but
> that's how I'd work it through my head in an interview.
> This is pretty much the same problem as "current week of the year" :-)
> Can't remember off the top of my head, but it's *extremely* easy to make
> an "off by one" error - I remember someone copying my Pickwiki code and
> getting it wrong, introducing the very error I'd fixed.
> Cheers,
> Wol
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