Re: [xslt] Troubles with the EXSLT date extensions

[Igor Zlatkovic <igor stud fh-frankfurt de>]

Hi there,

> seems some people are using them and are hitting a few bugs:
>    http://bugzilla.gnome.org/show_bug.cgi?id=93444
>    http://bugzilla.gnome.org/show_bug.cgi?id=92818

The one thing I believe is wrong is the reversed substraction. Exslt.org
says, that in
  d = date:difference(x, y):
    d is positive if x < y (means if x occurs before y),
    d is negative if x > y.
Folowing this, the basic guide would be to compute the difference as
  d = y - x
The relevant function inn libexslt computes it as
  d = x - y
which results in the wrong sign. Can it be, that I am right there? :-)

That should however produce the wrong result dw, which is nothing else than
  dw = d * -1
but it should not produce anything different to that, which it does for
certain combinations of x and y.

I'll now check where the wrong numbers, that is those which differ from the
correct result by more than d * -1, come from. I suspect the problem to be
some odd double->long conversion, or similar.

Ciao
Igor