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Thank You, Luiz
Now everything is OK:-)

I read about strfind function in "Programing in
Lua",Roberto Ierusalimschy but it is about Lua 4.0...
In my opinion, reading "Lua 5.0 Reference Manual",
gfind is the nearest by strfind...but I don't know why
it does not work as well I suppose:-(

--- Luiz Henrique de Figueiredo
<lhf@tecgraf.puc-rio.br> wrote:
> >d1.day, d1.month, d1.year = string.gfind( date1,
> "(%d+).(%d+).(%d+)");
> >...but gfind do not work for me:-(
> 
> You need to ignore the first 2 return values. Try
> the code below.
> --lhf
> 
> function str2time(s)
>  local d={}
>  local a,b
>  a, b, d.day, d.month, d.year = string.find(s,
> "(%d+).(%d+).(%d+)");
>  return os.time(d)
> end
> 
> function diff(a,b)
>  return
> os.difftime(str2time(b),str2time(a))/(60*60*24)
> end


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