From: "Kroeger Simon (ext)" <simon.kroeger.ext@...>
Date: 2005-07-29T20:23:07+09:00
Subject: AW: add_weekdays method

 
> Thanks for the alternative implementation Todd.  I'm still 
> running with 
> my original but I've changed it ever so slightly, as it's now in the 
> Time class rather than Date, and therefore I'm first creating a new 
> DateTime and then adding days to it.
> 
> def add_weekdays(days)
>    new_date = DateTime.new(self.year, self.month, self.day, 
> self.hour, 
> self.min, self.sec)
>    while days > 0
>      new_date += 1
>      days -= 1 unless (new_date.wday == 6 || new_date.wday == 0)
>    end
>    new_date
> end
> 
> I'm pretty certain it doesn't, but, on the off chance it makes a 
> difference this is to be used in a Rails app.
> 
> Chris

Hi Chris,

i guess the iteration isn't necessary at all, perhaps this would
do the job (not so much tested):

class Date
   def add_weekdays(days)
     new_date = self
     
     new_date += (days / 5) * 7 
     new_date += 1 if (new_date.wday==6) 
     new_date += 1 if (new_date.wday==0) 
     
     new_date += 2 if (new_date.wday + (days % 5)) > 5
     
     new_date += (days % 5)
     new_date
   end
 end

(I'm sure this could be written even more compressed)

Simon