Rails - May 2006 - How to get difference between two dates in days???

Hi,

I want to calculate difference between Current date & previous date 
(stored in database). The difference should be in days. Hhow to do 
that??
PLs tell me.

Thanx in advance.
Prash

-- 
Posted via http://www.ruby-forum.com/.

Prashant Tiwari <tiwari_p_k@...> writes:
> I want to calculate difference between Current date & previous date 
> (stored in database). The difference should be in days. Hhow to do 
> that??
What about:

$ irb
> require ''date''
> ( Date.new(2006, 01, 02) - Date.new(2006, 01, 01) ).to_i
=> 1

?

Regards,
Marco

HI,
but when I am trying following into my view it giving me error:-
==========( Date.new(2006, 01, 02) - Date.new(2006, 01, 01) ).to_i
===========
& error is:-
===========compile error
./script/../config/../app/views/comments/show.rhtml:74: syntax error
Date.new(2006, 01, 02) - Date.new(2006, 01, 01) ); _erbout.concat "\n"
                                                ^
============Why I am getting this error?>
Thanx,
Prash

-- 
Posted via http://www.ruby-forum.com/.

On 08/05/06, Prashant Tiwari <tiwari_p_k@yahoo.com>
wrote:
> HI,
> but when I am trying following into my view it giving me error:-
> ==========> ( Date.new(2006, 01, 02) - Date.new(2006, 01, 01) ).to_i
> ===========>
> & error is:-
> ===========> compile error
> ./script/../config/../app/views/comments/show.rhtml:74: syntax error
> Date.new(2006, 01, 02) - Date.new(2006, 01, 01) ); _erbout.concat
"\n"
>                                                 ^
> ============> Why I am getting this error?>
That was a pure Ruby snippet of code.

If you wish to calculate the difference between two dates in a View,
you have to write something like:

  <%= ( @my_model.previous_date - Date.today() ).to_i %>

(assuming you''ve your model in an instance variable called
''my_model'').

Marco

Marco Lazzeri wrote:
> That was a pure Ruby snippet of code.
> 
> If you wish to calculate the difference between two dates in a View,
> you have to write something like:
> 
>  <%= ( @my_model.previous_date - Date.today() ).to_i %>
> 
> (assuming you''ve your model in an instance variable called
''my_model'').
I''m a little rusty, but doesn''t erb want strings? Seems like I
had to put a .to_s on the
end of stuff like the above.

b

On 5/8/06, Ben Munat <bent@munat.com> wrote:
> Marco Lazzeri wrote:
> I''m a little rusty, but doesn''t erb want strings? Seems
like I had to put a .to_s on the
> end of stuff like the above.
Well, my Rails doesn''t complain when I do <%= "50".to_i
%> at least.
(I just tried it). :)

Mathias.

Prashant Tiwari wrote:
> Hi,
> 
> I want to calculate difference between Current date & previous date 
> (stored in database). The difference should be in days. Hhow to do 
> that??
> PLs tell me.
> 
> Thanx in advance.
> Prash
Have a look at the Rails API for the method distance_of_time_in_words

example: -

<%= distance_of_time_in_words(Time.now, record.created_on) %>


-- 
Posted via http://www.ruby-forum.com/.

Huh. I don''t know what I was thinking of then... sorry for the noise.

b

Mathias Wittlock wrote:
> On 5/8/06, Ben Munat <bent@munat.com> wrote:
> 
>> Marco Lazzeri wrote:
>> I''m a little rusty, but doesn''t erb want strings?
Seems like I had to
>> put a .to_s on the
>> end of stuff like the above.
> 
> 
> Well, my Rails doesn''t complain when I do <%=
"50".to_i %> at least.
> (I just tried it). :)
> 
> Mathias.
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