From: Justin Collins <collinsj@...>
Date: 2005-09-28T06:17:53+09:00
Subject: Re: Time interval

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Daniel Berger wrote:

> Hi all,
>
> I was just wondering if anyone has implemented an "Interval" class of 
> some sort out there, i.e. something that would give you the years, 
> months, days, hours, minutes and seconds between two fixed DateTime 
> objects, rather than an absolute date.
>
> I see that Gavin Sinclair brought this issue up a couple times last 
> year (ruby-talk:95236, ruby-talk:103601), but I didn't see any sort of 
> package on the RAA.
>
> I had something of my own with "fixed-time" but it doesn't handle 
> Date, Time or DateTime objects (i.e. it needs a major makeover).  
> Before I do that, though, I wanted to see if anyone out there (Gavin?) 
> already had something out there, sitting on their hard drive, but 
> unreleased.
>
> Regards,
>
> Dan
>
> PS - I'm very confused by the current implementation of "-" (minus) 
> for Date and DateTime, where the returned value is a Rational.  Can 
> someone elaborate on how this is used?
>

You may wish to look into Runt - http://raa.ruby-lang.org/project/runt/

 From the description:

    Runt is an implementation of select temporal patterns by Martin
    Fowler in the super-fantastic Ruby language. Runt provides:

    * recurring events defined using simple, set-like expressions
    * an API for creating schedules for arbitrary events/objects
    * precisioned date types using Time Points
    * date Ranges
    * everlasting peace and/or eternal life


-Justin

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