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Posted by Jochem Maas on 10/20/97 11:14
Mario de Frutos Dieguez wrote:
> Hi!
>
> I'm back hahaha :D
>
> I'm making functions to calculate the duration (only laboral days)
> between 2 dates and the initial and final date between a duration give
> me in laboral days.
>
> I use the following function to make the diference between 2 dates:
>
> function fecDiferenciaFechas($fecFechaInicio,$fecFechaFin)
> {
> $fecFechaInicio=strtotime($fecFechaInicio);
> $fecFechaFin=strtotime($fecFechaFin);
> if ($fecFechaFin == -1 || $fecFechaInicio == -1)
> {
> return false;
> }
> $iDiferencia = $fecFechaFin - $fecFechaInicio;
> //Inicializamos la variable
> $iDias = 0;
> //Devolvemos la diferencia en dias
> return ($iDiferencia/86400);
> }
>
> The problem is that with a duration of 220 the return is 219.958333,
> where im losing precision?
computers can't stores floats precisely, precision errors are. Rasmus gave a good explaination
of this on this list not so long ago - that said there is lots of info on this on the web,
here is one good article to get you started:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
on a more practical note take a look at the following php functions:
round(), ceil(), floor()
one of those should provide you with a 'fix' to the precision error(s) you are
seeing.
>
> (Sorry for my home english :P)
Don't worry about it! my spanish begins and ends at 'Hasta la vista' ;-)
actually that's not strictly true - I managed to have a whole conversation
in Spanish once only using the word 'bale' (I think there is supposed to be an accent on
the 'e' of 'bale')
(btw. I couldn't quite figure out what 'home english' is)
>
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