From: Rob Redmon <rob.webinator@...>
Date: 2008-04-05T00:20:17+09:00
Subject: Re: Convert day of year to month, day

James Gray wrote:
> On Apr 4, 2008, at 9:38 AM, Rob Redmon wrote:
> 
>> What's the "ruby way" to go from a date/time format that is "Year
>> Day_of_Year time" to "Year Month Day".  E.g. I want to convert
>> year=2008, day_of_year=095, frequently represented as "2008-095" to  
>> it's
>> more usual format "2008-04-04".  I've been playing with the Time class
>> and it's methods and found nifty ways to get yday, e.g.
>> Time.now.utc.yday, but how do I easily go backwards w/o writing my own
>> simple converter?
> 
> How's this?
> 
>  >> require "date"
> => true
>  >> Date.strptime("2008-095", "%Y-%j").to_s
> => "2008-04-04"
> 
> James Edward Gray II

Good idea, but doesn't work for me:
irb(main):065:0> Date.strptime("2008-095", "%Y-%J").to_s
ArgumentError: invalid date
        from /usr/lib/ruby/1.8/date.rb:650:in `new_with_hash'
        from /usr/lib/ruby/1.8/date.rb:675:in `strptime'
        from (irb):65
        from :0

Maybe my version of Ruby (1.8.1) is too old.  The computer in question 
is managed by the network pirates and unlikely to be upgraded.  This is 
a noob thought, but is there a way for me to locally upgrade the Date 
class, ala a Ruby Gem?

R
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