From: Kevin Olbrich <devlists-ruby-talk@...>
Date: 2006-09-06T14:57:44+09:00
Subject: Re: [ANN] timeunits-0.0.0


On Wednesday, September 06, 2006, at 10:04 AM,  wrote:
>On Wed, 6 Sep 2006, Logan Capaldo wrote:
>
>>
>> On Sep 5, 2006, at 6:36 PM, ara.t.howard@noaa.gov wrote:
>>
>>> On Wed, 6 Sep 2006, Kevin Olbrich wrote:
>>>
>>>> FWIW,
>>>>
>>>> Rails already does this, as does Facets, the conversions gem, and the
>>>> ruby-units gem.
>>>>

>> I'm not exactly sure what delta.days means in this case, but rails
>>does the
>> following with your example:
>>
>> % script/console
>> Loading development environment.
>>>> a = Time.now
>> => Tue Sep 05 19:50:11 -0400 2006
>>>> b = a + 42.seconds
>> => Tue Sep 05 19:50:53 -0400 2006
>>>> delta = b - a
>> => 42.0
>>>> p delta.days
>> 3628800.0
>> => nil
>
>i just realized this might explain it better
>
>   harp:~ > cat a.rb
>   require 'yaml'
>   require 'rubygems'
>   require 'timeunits'
>
>   a = Time.now.utc
>   b = a + 42.seconds
>
>   delta = b - a
>
>   y 'delta.days' => delta.days
>
>   pct_day = delta.days
>   y 'seconds' => (pct_day * 1.day).seconds
>
>
>   harp:~ > ruby a.rb
>   delta.days: 0.000486111111111111
>   seconds: 42.0
>
>-a
>--
>what science finds to be nonexistent, we must accept as nonexistent;
>but what
>science merely does not find is a completely different matter... it
>is quite
>clear that there are many, many mysterious things.
>- h.h. the 14th dalai lama
>

Hmm, yeah looks like rails has some issues there, although you can do..

(42.seconds / 1.day).to_f
#=>  0.000486111111111111

in rails.

I like this better...

require 'rubygems'
require 'ruby-units'

a = "#{Time.now.to_i} s".unit
b = a + '42 s'
delta = b-a
#=> 42 s

delta.to("days")
#=> 0.000486111 d

delta.to("fortnight")
#=>3.47222e-05 fortnight

delta.to("ms")
#=>42000 ms

delta.to('century')
#=> 1.33093e-08 century

I'm sure you can do something similar with Facets.
You can also do just about any other unit you can think of with Facets  
and ruby-units.

Disclaimer:  there are still a few bugs in ruby-units, mostly related to  
properly parsing some ambiguous units.


_Kevin
www.sciwerks.com

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