From: Siep Korteling <s.korteling@...>
Date: 2008-07-19T07:04:08+09:00
Subject: Re: Finding the date of an event based on related events.

Kaldrenon wrote:
> Hi all,
> 
> I'm doing some planning to write a simple utility program for
> maintaining my schedule. The basic scenario is that, in my job, I have
> a series of multi-stage procedures to perform, and for each instance
> of the procedure, the stages need to happen a fixed number of business
> days apart (i.e, if step one happens on Monday, step two is Friday,
> but if step one is Tuesday, step two will be the following Monday). As
> one of the first steps of the program, I'm going to write a script to
> quickly spit out the calendar dates of all steps given the date of the
> first and the relative date (in business days) of all the others.
> 
> My question is, can you help me drum up a 'smart' way to take weekends
> and holidays into account? 
(...)
> 
> -Andrew Fallows

To exclude just the weekends you could do

class Date
   def add_workdays(n)
      days_to_add =((self.cwday+n-1)/5)*2 +n
      self + days_to_add
   end
 end

Which returns a new Date and seems to work with negative n's. (Just 
wrote this code, don't know if it's bullet proof).

Holidays are a complication.Ideally the solution would allow for 
different holidays for different countries. Working hours could be 
specified, to enable  calculating exactly when a 14 hour job starting on 
friday 24 december 15:15 in the US would finish.

Two applications I work with have these features. I'm not aware of a 
ruby solution/gem.

Regards,

Siep
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