From: List Recv <listrecv@...>
Date: 2006-10-27T06:35:10+09:00
Subject: Re: Time without Date

The problem with Time is that it tracks a date also.

Let me explain:

I have a scheduler, which, for example, can be set to do something at 3
PM.  I'd like to store that time in an object, and then take a Time,
chop off the date part, and see if the time matches.

Make sense?


Paul Lutus wrote:
> List Recv wrote:
>
> > Is there any class or lib to deal with Times without Date?  (Eg "3:30
> > PM" - but I don't want it associated with a date.)
> >
> > Ideally, I'd like to:
> > * Have clock arithmetic (1 AM minus 90 minutes is 11:30 PM)
> > * Convert from DateTime to dateless times (and, by adding a date, back)
> > * Store it with ActiveRecord
> >
> > Any ideas?
>
> Have you tried the Time class?
>
> #!/usr/bin/ruby -w
>
> is = Time.new
>
> h = 4 # hours
>
> was = is - (h * 60 * 60)
>
> puts "Time now: #{is}\nTime then: #{was}"
>
> Output:
>
> Time now: Thu Oct 26 14:10:41 PDT 2006
> Time then: Thu Oct 26 10:10:41 PDT 2006
>
> The Time object is expressed in seconds elapsed since 1/1/1970 00:00 GMT.
> Just add or subtract seconds to get what you want. And the 1970 limitation
> isn't actually much of a limitation:
>
> irb(main):008:0> t = Time.new - (100 * 60 * 60 * 24 * 365.25)
> => Fri Oct 26 13:16:52 PST 1906
> 
> -- 
> Paul Lutus
> http://www.arachnoid.com