Division by zero in innreport

Julien ÉLIE julien at trigofacile.com
Sat Jan 7 00:01:55 UTC 2012

Hi Russ,

>> There is an issue in how innreport translates these dates.  The
>> ConvDate() function assumes the dates are relative to the *current*
>> year.  So it thinks it has been passed Dec 31th 2012 and Jan 1st 2012
>> (whereas it was Dec 31th 2010 and Jan 1st 2011).  As 2012 is a leap
>> year, and Dec 31th is after Feb 28th, the translated date contains an
>> unexpected "+1 day".
> This bug has been around for a long time.  I think it may even be in Trac
> or TODO or somewhere, since I recall trying to fix it once and then
> getting too confused by the date parsing code and giving up.

I think you refer to:

The identified bug (counting the right number of days) was fixed but 
another trickier one was introduced.

It is true that the date parsing code is confusing!

In the patch I attached to my previous mail, I make use of Time::Local 
to convert dates to seconds since epoch, thus modifying the behaviour of 
ConvDate() which was converting dates to seconds since January, 1st.

I bet innreport now runs slower, but I think it is better to achieve 
robustness (the code using Time::Local seems easier to read and maintain).
In case you, Alexander or another reader here see improvements, do not 
hesitate to tell.

I hope not to have introduced another bug.
At least, this patched version currently runs fine and generate a normal 
HTML index page on my news server.

Julien ÉLIE

« Les ouvriers qui font la pause lentilles voient arriver un visiteur
   inattendu… » (Astérix)

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