Forum: Ruby relative dates

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73606b1d1042de19056f3d59492b652f?d=identicon&s=25 Charlie Bowman (beachguy82)
on 2006-01-30 01:15
today = Time.now

how can I do this? "last_week = 7.days.ago"

I know the above won't work, but how can I get the date of last week?
6076c22b65b36f5d75c30bdcfb2fda85?d=identicon&s=25 Ezra Zygmuntowicz (Guest)
on 2006-01-30 03:07
(Received via mailing list)
On Jan 29, 2006, at 4:15 PM, charlie bowman wrote:

> today = Time.now
>
> how can I do this? "last_week = 7.days.ago"
>
> I know the above won't work, but how can I get the date of last week?
>
> --
> Posted via http://www.ruby-forum.com/.
>

Charlie-

	In rails actionpack supplies that method for you. Look here:

 >> require 'rubygems'
=> false
 >> require_gem 'actionpack'
=> true
 >> 7.days.ago
=> Sun Jan 22 18:04:05 PST 2006
 >>



Cheers-
-Ezra Zygmuntowicz
WebMaster
Yakima Herald-Republic Newspaper
http://yakimaherald.com
ezra@yakima-herald.com
blog: http://brainspl.at
A4a4095ff08bd0fced3c3fddbeac743a?d=identicon&s=25 Cameron McBride (Guest)
on 2006-01-30 04:22
(Received via mailing list)
> how can I do this? "last_week = 7.days.ago"

or subtract in seconds:
  last_week = today - 7*24*60*60

Cameron
05e48e632fdd0b2c25d27042f52c11d5?d=identicon&s=25 A LeDonne (Guest)
on 2006-01-30 05:29
(Received via mailing list)
On 1/29/06, Cameron McBride <cameron.mcbride@gmail.com> wrote:
> > how can I do this? "last_week = 7.days.ago"
>
> or subtract in seconds:
>   last_week = today - 7*24*60*60
>
> Cameron
>

This is probably going to be easier with Date than with Time...

irb(main):001:0> require 'date'
=> true
irb(main):002:0> now = Date.today; now.strftime()
=> "2006-01-29"
irb(main):003:0> last_week = now - 7; last_week.strftime()
=> "2006-01-22"

If you are concerned about times, you can use DateTime in place of Date
above.

-A
73606b1d1042de19056f3d59492b652f?d=identicon&s=25 Charlie Bowman (beachguy82)
on 2006-01-30 05:55
Thanks, I had no idea that it was so simple in Ruby!


today = Time.now
puts (today - 7)


I thought I would have to write the method myself!






A LeDonne wrote:
> On 1/29/06, Cameron McBride <cameron.mcbride@gmail.com> wrote:
>> > how can I do this? "last_week = 7.days.ago"
>>
>> or subtract in seconds:
>>   last_week = today - 7*24*60*60
>>
>> Cameron
>>
>
> This is probably going to be easier with Date than with Time...
>
> irb(main):001:0> require 'date'
> => true
> irb(main):002:0> now = Date.today; now.strftime()
> => "2006-01-29"
> irb(main):003:0> last_week = now - 7; last_week.strftime()
> => "2006-01-22"
>
> If you are concerned about times, you can use DateTime in place of Date
> above.
>
> -A
05e48e632fdd0b2c25d27042f52c11d5?d=identicon&s=25 A LeDonne (Guest)
on 2006-01-30 06:17
(Received via mailing list)
On 1/29/06, charlie bowman <cbowmanschool@yahoo.com> wrote:
> Thanks, I had no idea that it was so simple in Ruby!
>
>
> today = Time.now
> puts (today - 7)

Careful!

If you're using Time, you're subtracting SECONDS:
irb(main):001:0> today = Time.now
=> Mon Jan 30 00:11:51 EST 2006
irb(main):002:0> puts( today - 7 )
Mon Jan 30 00:11:44 EST 2006
=> nil

That's why I included the " require 'date' " in my example, and
suggested that you could use DateTime if you needed times.
00e3a96684ab390a350b0271e98741d3?d=identicon&s=25 Nshbrown Nshbrown (nshb)
on 2006-01-30 06:33
(Received via mailing list)
You might want to check out RUNT:

http://runt.rubyforge.org/

DateBox might also be worth a gander:

http://datebox.inimit.com

-Nb

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Nathaniel S. H. Brown                           http://nshb.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6076c22b65b36f5d75c30bdcfb2fda85?d=identicon&s=25 Ezra Zygmuntowicz (Guest)
on 2006-01-30 08:01
(Received via mailing list)
On Jan 29, 2006, at 8:28 PM, A LeDonne wrote:

> On 1/29/06, Cameron McBride <cameron.mcbride@gmail.com> wrote:
>>> how can I do this? "last_week = 7.days.ago"

In rails you are already done:

 >> require_gem 'actionpack'
=> true
 >> last_week = 7.days.ago
=> Sun Jan 22 22:59:26 PST 2006
 >> p last_week
Sun Jan 22 22:59:26 PST 2006

-Ezra



> => true
> irb(main):002:0> now = Date.today; now.strftime()
> => "2006-01-29"
> irb(main):003:0> last_week = now - 7; last_week.strftime()
> => "2006-01-22"
>
> If you are concerned about times, you can use DateTime in place of
> Date above.
>
> -A
>

-Ezra Zygmuntowicz
WebMaster
Yakima Herald-Republic Newspaper
http://yakimaherald.com
ezra@yakima-herald.com
blog: http://brainspl.at
73606b1d1042de19056f3d59492b652f?d=identicon&s=25 Charlie Bowman (beachguy82)
on 2006-01-30 14:27
Your're right! as soon as I implemented it I noticed the seconds change.
I just came up with the number of seconds in a day and used that.  I
would be nice if it were as simple in ruby as it is in rails, but I know
speed is more important and ease of use.....usually.

A LeDonne wrote:
> On 1/29/06, charlie bowman <cbowmanschool@yahoo.com> wrote:
>> Thanks, I had no idea that it was so simple in Ruby!
>>
>>
>> today = Time.now
>> puts (today - 7)
>
> Careful!
>
> If you're using Time, you're subtracting SECONDS:
> irb(main):001:0> today = Time.now
> => Mon Jan 30 00:11:51 EST 2006
> irb(main):002:0> puts( today - 7 )
> Mon Jan 30 00:11:44 EST 2006
> => nil
>
> That's why I included the " require 'date' " in my example, and
> suggested that you could use DateTime if you needed times.
622fa8560c82dfaa59c91ec75efb0c19?d=identicon&s=25 Alex Combas (Guest)
on 2006-01-30 18:59
(Received via mailing list)
On 1/30/06, charlie bowman <cbowmanschool@yahoo.com> wrote:
> Your're right! as soon as I implemented it I noticed the seconds change.
> I just came up with the number of seconds in a day and used that.  I
> would be nice if it were as simple in ruby as it is in rails, but I know
> speed is more important and ease of use.....usually.
>

What?! Speed more important than ease of use in Ruby!? Surly you jest
sir!!

=)
E9aaf375ab80de48d8f51b28a43c3a5f?d=identicon&s=25 Antonio Cangiano (Guest)
on 2006-02-01 22:42
(Received via mailing list)
charlie bowman wrote:
> today = Time.now
>
> how can I do this? "last_week = 7.days.ago"
>
> I know the above won't work, but how can I get the date of last week?
>

Hi Charlie,
you could define something like this:

class Integer
   def weeks
     self * 7.days
   end

   def days
     self * 24.hours
   end

   def hours
     self * 60.minutes
   end

   def minutes
     self * 60
   end

   def ago(time = Time.now)
     time - self
   end
end

puts 7.days.ago  #=> Mon Jan 23 01:50:09 GMT 2006
puts 1.weeks.ago #=> Mon Jan 23 01:50:09 GMT 2006

Of course you can alias days with day, weeks with week, add months,
years and so on. You can also add extra methods like Rails does (until,
since, from_now, etc...)

Cheers,
Antonio
65bd9e4c5aebde25ebf16d599339d570?d=identicon&s=25 Adam Sanderson (Guest)
on 2006-02-01 23:15
(Received via mailing list)
Depending on if you need the time component, it may just be eaiser to
work with the Date object.

d = Date.today
lw = d - 7

'lw' will be 7 days ago.  In this case adding and subtracting seconds
will be fine, but be careful about it, days aren't always 24 hours long
(think about daylight savings time), and it can really catch up with
you sometimes.

  .adam
40823088cec28c3224ff4c46ced1beda?d=identicon&s=25 Seth Thomas Rasmussen (Guest)
on 2006-02-01 23:31
(Received via mailing list)
Haha... it appears like you got ignored doubly for having the exact,
ready-made solution for his problem.

Weird world...
40823088cec28c3224ff4c46ced1beda?d=identicon&s=25 Seth Thomas Rasmussen (Guest)
on 2006-02-01 23:31
(Received via mailing list)
Charlie,

"I would be nice if it were as simple in ruby as it is in rails"

First, Rails is Ruby. Second, Rails is a smart grouping of stand-alone
components, one of which already has the extensions to do EXACTLY what
you mentioned in your first post.

I'm curious to know why you and the rest of the group seem so focused
on other solutions, given that something so slick already exists. I may
have glanced over the replies too quickly, but it didn't seem like
their are requirements that rule out the ActionPack solution.
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