From: Mohit Sindhwani <mo_mail@...>
Date: 2007-09-26T22:58:20+09:00
Subject: Re: Finding the last Sunday of a month

Peter Bailey wrote:
> Hello,
> I need to find the date for the last Sunday in January, for any year. I
> need this for a budgetary script I'm trying to write. Using the
> Date/Time module, I've done this so far.
>
> require 'date'
> now = DateTime.now
> year = now.year
> d = Date.new(now.year, 1, 31)
> puts d.wday
>
> yields: 3
>   

The last Sunday of that month can be got this way, I think:

require 'date'
now = DateTime.now
year = now.year
d = Date.new(now.year, 1, 31)
i = d.wday
last_sunday = Date.new(now.year, 1, (31-i))
puts last_sunday

The reference for dates is at:
http://corelib.rubyonrails.org/classes/Date.html

Cheers
mohit.