From: Robert Klemme <shortcutter@...>
Date: 2007-03-20T21:30:04+09:00
Subject: Re: Sorting Dates and Times in an array

On 19.03.2007 20:57, Paul wrote:
> On Mar 19, 1:21 pm, Robert Klemme wrote:
>> I think this does not meet the OP's requirements (because of descending
>> date).
>>
>> epoch = Date.new(0)
>> @date_array.sort_by {|dt,tm| [epoch - Date.parse(dt), Time.parse(tm)]}
>>
>> Substraction with epoch will make date components negative and thus lead
>> to descending ordering.
>>
> 
> Hello Robert, I tried this but I get the following errors:
> 
> irb(main):003:0> epoch = Date.new(0)
> ArgumentError: wrong number of arguments (1 for 0)
>         from (irb):3:in `initialize'
>         from (irb):3
> 
> irb(main):005:0> @date_array.sort_by {|dt,tm| [epoch - Date.parse(dt),
> Time.parse(tm)]}
> NoMethodError: undefined method `parse' for Date:Class
>         from (irb):5
>         from (irb):5:in `sort_by'
>         from (irb):5
> 
> Am I missing a 'require' or something to make your lines work?

Maybe it's the version?

13:25:57 [~]: irb
irb(main):001:0> Date.new 0
NameError: uninitialized constant Date
         from (irb):1
         from :0
irb(main):002:0> require 'date'
=> true
irb(main):003:0> Date.new 0
=> #<Date: 3442115/2,0,2299161>
irb(main):004:0> RUBY_VERSION
=> "1.8.5"
irb(main):005:0>

Kind regards

	robert