From: Brian Candler <b.candler@...>
Date: 2008-10-28T19:18:52+09:00
Subject: Re: Days in a year

P奪l Bergstr旦m wrote:
> A stupid question in the first place. I've done like this; I check if 
> Feb in a particular year has 29 days or not, so it gives 365 or 366 
> days. Simple. :-)

And notice how days_in_month is implemented in activesupport:

          def days_in_month(month, year = now.year)
            return 29 if month == 2 && ::Date.gregorian_leap?(year)
            COMMON_YEAR_DAYS_IN_MONTH[month]
          end

So all you need is:

irb(main):001:0> require 'date'
=> true
irb(main):002:0> Date.gregorian_leap?(2008) ? 366 : 365
=> 366
irb(main):003:0> Date.gregorian_leap?(2009) ? 366 : 365
=> 365
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