From: ara.t.howard@...
Date: 2006-09-06T10:04:24+09:00
Subject: Re: [ANN] timeunits-0.0.0

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.
>>> 
>>> The API varies a little bit.
>> 
>> they do this?
>> 
>>   a = Time.now
>>   b = a + 42.seconds
>> 
>>   delta = b - a
>> 
>>   p delta.days #=> 0.000486111111111111
>> 
>> i didn't know they handled time differences too?  i'm sure rails does not 
>> do
>> this and the docs for facets seems to show it does not.  are you sure?
>
> 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