Rails - Nov 2010 - Todays month first day and previous month first day

Hello everyone.

Please advice how to get todays month first day and previous month first
day.

If go on by this post date, it will need to  give me now
01-11-2010
and
01-10-2010

or if today was like 3 Jan 2010 it would be
01-01-2010
and
01-12-2009

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

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Something like:

Date.today.beginning_of_month

Date.today.ago(1.month).beginning_of_month

Probably an easier way, just off the top of my head.

Jamey


On Wed, Nov 3, 2010 at 9:43 AM, Vitaliy Yanchuk
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> Hello everyone.
>
> Please advice how to get todays month first day and previous month first
> day.
>
> If go on by this post date, it will need to  give me now
> 01-11-2010
> and
> 01-10-2010
>
> or if today was like 3 Jan 2010 it would be
> 01-01-2010
> and
> 01-12-2009
>
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To unsubscribe from this group, send email to
>
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org<rubyonrails-talk%2Bunsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Vitaliy Yanchuk wrote in post #958983:
> Hello everyone.
>
> Please advice how to get todays month first day and previous month first
> day.
>
> If go on by this post date, it will need to  give me now
> 01-11-2010
> and
> 01-10-2010
>
> or if today was like 3 Jan 2010 it would be
> 01-01-2010
> and
> 01-12-2009
ruby-1.9.2-p0 > today = Time.now
 => 2010-11-03 10:02:46 -0400
ruby-1.9.2-p0 > today.at_beginning_of_month
 => 2010-11-01 00:00:00 -0400
ruby-1.9.2-p0 > today.beginning_of_month
 => 2010-11-01 00:00:00 -0400
ruby-1.9.2-p0 > today.beginning_of_month - 1.month
 => 2010-10-01 00:00:00 -0400

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

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Robert Walker wrote in post #958994:
> ruby-1.9.2-p0 > today = Time.now
>  => 2010-11-03 10:02:46 -0400
> ruby-1.9.2-p0 > today.at_beginning_of_month
>  => 2010-11-01 00:00:00 -0400
> ruby-1.9.2-p0 > today.beginning_of_month
>  => 2010-11-01 00:00:00 -0400
> ruby-1.9.2-p0 > today.beginning_of_month - 1.month
>  => 2010-10-01 00:00:00 -0400
Jamey Cribbs wrote
> Date.today.beginning_of_month
Or yes, using Date rather than Time as Jamie showed.

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

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

On Nov 3, 2010, at 10:09 AM, Robert Walker wrote:
> Robert Walker wrote in post #958994:
>> ruby-1.9.2-p0 > today = Time.now
>> => 2010-11-03 10:02:46 -0400
>> ruby-1.9.2-p0 > today.at_beginning_of_month
>> => 2010-11-01 00:00:00 -0400
>> ruby-1.9.2-p0 > today.beginning_of_month
>> => 2010-11-01 00:00:00 -0400
>> ruby-1.9.2-p0 > today.beginning_of_month - 1.month
>> => 2010-10-01 00:00:00 -0400
>
> Jamey Cribbs wrote
>> Date.today.beginning_of_month
>
> Or yes, using Date rather than Time as Jamie showed.
Current versions of ActiveSupport handle this properly, but older  
versions that treat 1.month simply as 30 days of seconds would fail to  
do the expected thing for dates in March (or any dates in months that  
follow a 31 day month -- yeah, it''s not looking too good).

However, you can get what you want with nothing more than the standard  
Ruby Date class:

[ruby-1.9.2-p0] :Users/rab $ irb
irb> require ''date''
=> true
irb> t = Date.today
=> #<Date: 2010-11-03 (4911007/2,0,2299161)>
irb> puts t
2010-11-03
=> nil
irb> bom = t - t.mday + 1
=> #<Date: 2010-11-01 (4911003/2,0,2299161)>
irb> puts bom
2010-11-01
=> nil
irb> prev = bom << 1
=> #<Date: 2010-10-01 (4910941/2,0,2299161)>
irb> puts prev
2010-10-01
=> nil

-Rob

Rob Biedenharn		
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
http://AgileConsultingLLC.com/
rab-/VpnD74mH8+00s0LW7PaslaTQe2KTcn/@public.gmane.org	
http://GaslightSoftware.com/

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Thanks all, the method beginning_of_month is just what I was looking 
for.

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

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

On 3 November 2010 14:56, Rob Biedenharn
<Rob-GBZH0y1GwQfnZcttdmLDtcI/UQi/AW5J@public.gmane.org>
wrote:
> Current versions of ActiveSupport handle this properly, but older versions
> that treat 1.month simply as 30 days of seconds would fail to do the
> expected thing for dates in March (or any dates in months that follow a 31
> day month -- yeah, it''s not looking too good).
ah... the old parsing "31st Feb" giving no error, but instead
returning "3rd March" :-)

You can also avoid errors given by "Date.today.beginning_of_month -
1.month" or "Date.today.beginning_of_month.ago(1.month)" by using
"Date.today.beginning_of_month.ago(1.day).beginning_of_month" as
another alternative option.

Dates and times are horrible...

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

OT The problem is very old. TSO, Time Sharing Option, was IBM''s first
commercial timesharing product. Its interactivity offered the first way for
most enterprise customers off punched cards. When the date first went from
February 28 to February 29 in 1972, the date on the session startup message
read "March 0".

On Sat, Nov 6, 2010 at 9:30 AM, Michael Pavling
<pavling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On 3 November 2010 14:56, Rob Biedenharn
<Rob-GBZH0y1GwQfnZcttdmLDtcI/UQi/AW5J@public.gmane.org>
> wrote:
> > Current versions of ActiveSupport handle this properly, but older
> versions
> > that treat 1.month simply as 30 days of seconds would fail to do the
> > expected thing for dates in March (or any dates in months that follow
a
> 31
> > day month -- yeah, it''s not looking too good).
>
> ah... the old parsing "31st Feb" giving no error, but instead
> returning "3rd March" :-)
>
> You can also avoid errors given by "Date.today.beginning_of_month -
> 1.month" or "Date.today.beginning_of_month.ago(1.month)" by
using
> "Date.today.beginning_of_month.ago(1.day).beginning_of_month" as
> another alternative.
>
> Dates and times are horrible...
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To unsubscribe from this group, send email to
>
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org<rubyonrails-talk%2Bunsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.