From: Lloyd Linklater <lloyd@2live4.com>
Date: 2007-09-27T01:29:07+09:00
Subject: Re: Finding the last Sunday of a month

caveat time!

If the first of the month is Sunday, my code does not work.  Here is a 
working version:

one_day = 86400
t = Time.gm(2008, 'jun', 1, 1, 1, 1)
if t.wday == 0
  t -= one_day
end
p (t - (one_day * t.wday)).day

Someone else can golf it.
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