Rails - Jun 2008 - how to parse a "dd/mm/yyyy" formatted date string???

Hi,

I''m stuck.  How do you parse a "dd/mm/yyyy" formatted date
string???

I get a date format error.

Thanks in advance
Greg

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s = "06/07/2008"

d = Date.parse(s)


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funny, this isn''t working for me...

On 6/8/08, alberto
<buildoutmanager-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> s = "06/07/2008"
>
> d = Date.parse(s)
>
>
> >
>
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I get an ArgumentError: Invalid Date?

I''m on:
Ruby 1.8.6
Rails 2.0.2

Any ideas?

On 6/8/08, Greg Hauptmann
<greg.hauptmann.ruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> funny, this isn''t working for me...
>
> On 6/8/08, alberto
<buildoutmanager-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>> s = "06/07/2008"
>>
>> d = Date.parse(s)
>>
>>
>> >>
>>
>
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It''s supposed to be strptime, to match Time.strftime to _output_ a date
in a
given format. Googling for that seems to yield either people using strptime or 
complaining about it.


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I found on the Ruby forum the following:
Date.strptime(''28/03/2008'', ''%d/%m/%Y'')



On Sun, Jun 8, 2008 at 3:37 PM, Phlip
<phlip2005-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> It''s supposed to be strptime, to match Time.strftime to _output_ a
date in
> a
> given format. Googling for that seems to yield either people using strptime
> or
> complaining about it.
>
>
> >
>
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Greg Hauptmann wrote:
> Hi,
> 
> I''m stuck.  How do you parse a "dd/mm/yyyy" formatted
date string???
>> ''12/14/1981''.to_date
=> Mon, 14 Dec 1981
>> ''12/14/1981''.to_time
=> Mon Dec 14 00:00:00 UTC 1981

Easy things should be easy.
-- 
Posted via http://www.ruby-forum.com/.

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#to_date or #to_time will throw an ArgumentError for the format Greg  
is working with, dd/mm/yyyy,

best.
mike

On Jun 8, 2008, at 5:21 AM, Daniel Waite wrote:
>
> Greg Hauptmann wrote:
>> Hi,
>>
>> I''m stuck.  How do you parse a "dd/mm/yyyy"
formatted date string???
>
>>> ''12/14/1981''.to_date
> => Mon, 14 Dec 1981
>
>>> ''12/14/1981''.to_time
> => Mon Dec 14 00:00:00 UTC 1981
>
> Easy things should be easy.
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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>> I''m stuck.  How do you parse a "dd/mm/yyyy"
formatted date string???
>
>>> ''12/14/1981''.to_date
> => Mon, 14 Dec 1981
>
>>> ''12/14/1981''.to_time
> => Mon Dec 14 00:00:00 UTC 1981
>
> Easy things should be easy.
In what locale? (-: 




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If the date helpers aren''t being kind:
if date_string =~ %r{(\d+)/(\d+)/(\d+)}
  Date::civil($3.to_i, $2.to_i, $1.to_i)
end

Fred
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Phlip wrote:
>>> I''m stuck.  How do you parse a "dd/mm/yyyy"
formatted date string???
>>
>>>> ''12/14/1981''.to_date
>> => Mon, 14 Dec 1981
>>
>>>> ''12/14/1981''.to_time
>> => Mon Dec 14 00:00:00 UTC 1981
>>
>> Easy things should be easy.
> 
> In what locale? (-:
http://mad.ly/2008/04/09/rails-21-time-zone-support-an-overview/

Difficult things should be possible. :)
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Michael Breen wrote:
> #to_date or #to_time will throw an ArgumentError for the format Greg
> is working with, dd/mm/yyyy,
> 
> best.
> mike
Did you run the code in console? Try it.
-- 
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That''s really odd... you might want to try doing a Time.parse(s)
also...

Thanks for the tip about #to_date and #to_time. You gotta love Rails
ActiveSupport!

On Jun 8, 2:10 pm, Daniel Waite
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Michael Breen wrote:
> > #to_date or #to_time will throw an ArgumentError for the format Greg
> > is working with, dd/mm/yyyy,
>
> > best.
> > mike
>
> Did you run the code in console? Try it.
> --
> Posted viahttp://www.ruby-forum.com/.
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yeah, I tried in the console using the format that Greg is working  
with (dd/mm/yyyy). Your example works fine (mm/dd/yyyy).

 >> ''14/12/1981''.to_date
ArgumentError: invalid date
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ 
ruby/1.8/date.rb:727:in `new''
	from /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/ 
active_support/core_ext/string/conversions.rb:19:in `to_date''
	from (irb):1
 >> ''14/12/1981''.to_time
ArgumentError: invalid date
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ 
ruby/1.8/date.rb:1482:in `civil''
	from /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/ 
active_support/core_ext/time/calculations.rb:39:in  
`time_with_datetime_fallback''
	from /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/ 
active_support/core_ext/time/calculations.rb:44:in `utc_time''
	from /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/ 
active_support/core_ext/string/conversions.rb:15:in `send''
	from /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/ 
active_support/core_ext/string/conversions.rb:15:in `to_time''
	from (irb):2


On Jun 8, 2008, at 5:10 PM, Daniel Waite wrote:
>
> Michael Breen wrote:
>> #to_date or #to_time will throw an ArgumentError for the format Greg
>> is working with, dd/mm/yyyy,
>>
>> best.
>> mike
>
> Did you run the code in console? Try it.
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Greg,
This is the hard part of following this forum...where is the oyster
that has the pearl?
I see you excellent bit of information in;
Date.strptime(''28/03/2008'', ''%d/%m/%Y'')
Obviously, this code is in your controller. It the field on the left
of the parens supposed to be the params[] that was passed from the
form.
Dates are so screwy in Ruby. I''ve never been able to figure out or see
anyone take a date from a user in a form_tag (non model input) and
process it into the controller.
I''ve recently take the ridiculous ''long way around the
barn'' and
instaniated a DATE field object in a placebo table to accept the
value;
example;
        y = Badboy.new
        y.playdate = row[1]
        if @asset.mtxes.find(:first, :conditions => {:mdate =>
y.playdate })
          @asset.mtxes.find(:first, :conditions => {:mdate =>
y.playdate }).destroy
        end
Badboy is a table that''s simply being instantiated for the brief time
that I need to borrow a WORKING datefield object.
Pretty crazy, huh?
Kathleen
On Jun 8, 12:39 am, "Greg Hauptmann"
<greg.hauptmann.r...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I found on the Ruby forum the following:
> Date.strptime(''28/03/2008'', ''%d/%m/%Y'')
>
>
>
> On Sun, Jun 8, 2008 at 3:37 PM, Phlip
<phlip2...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > It''s supposed to be strptime, to match Time.strftime to
_output_ a date in
> > a
> > given format. Googling for that seems to yield either people using
strptime
> > or
> > complaining about it.- Hide quoted text -
>
> - Show quoted text -
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On 9 Jun 2008, at 16:21, KathysKode-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
>
> Greg,
> This is the hard part of following this forum...where is the oyster
> that has the pearl?
> I see you excellent bit of information in;
> Date.strptime(''28/03/2008'', ''%d/%m/%Y'')
> Obviously, this code is in your controller. It the field on the left
> of the parens supposed to be the params[] that was passed from the
> form.
> Dates are so screwy in Ruby. I''ve never been able to figure out or
see
> anyone take a date from a user in a form_tag (non model input) and
> process it into the controller.
if you''re doing that then you don''t need to be messing around
with
parsing strings. As part of the params you get a hash, so (by default)  
the respective components of the date are params[:date][:year],  
params[:date][:month] and params[:date][:day]. Just call to_i on these  
and pass them to Time.mktime or Date::civil

Fred

>
> I''ve recently take the ridiculous ''long way around the
barn'' and
> instaniated a DATE field object in a placebo table to accept the
> value;
> example;
>        y = Badboy.new
>        y.playdate = row[1]
>        if @asset.mtxes.find(:first, :conditions => {:mdate =>
> y.playdate })
>          @asset.mtxes.find(:first, :conditions => {:mdate =>
> y.playdate }).destroy
>        end
> Badboy is a table that''s simply being instantiated for the brief
time
> that I need to borrow a WORKING datefield object.
> Pretty crazy, huh?
> Kathleen
> On Jun 8, 12:39 am, "Greg Hauptmann"
<greg.hauptmann.r...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>> I found on the Ruby forum the following:
>> Date.strptime(''28/03/2008'',
''%d/%m/%Y'')
>>
>>
>>
>> On Sun, Jun 8, 2008 at 3:37 PM, Phlip
<phlip2...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>>> It''s supposed to be strptime, to match Time.strftime to
_output_ a
>>> date in
>>> a
>>> given format. Googling for that seems to yield either people using
>>> strptime
>>> or
>>> complaining about it.- Hide quoted text -
>>
>> - Show quoted text -
> >

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thanks guys but, the issue in my use case is that I''m actually
uploading a
CSV file and then parsing it - so it''s actually the CSV parsing
routines
that I''m using directly.  So my questions was more around Ruby data
handling
I guess than Rails (as in my use case I''m not really using Rails
directly)

Cheers
Greg

On Tue, Jun 10, 2008 at 1:26 AM, Frederick Cheung <
frederick.cheung-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
> On 9 Jun 2008, at 16:21, KathysKode-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
>
> >
> > Greg,
> > This is the hard part of following this forum...where is the oyster
> > that has the pearl?
> > I see you excellent bit of information in;
> > Date.strptime(''28/03/2008'',
''%d/%m/%Y'')
> > Obviously, this code is in your controller. It the field on the left
> > of the parens supposed to be the params[] that was passed from the
> > form.
> > Dates are so screwy in Ruby. I''ve never been able to figure
out or see
> > anyone take a date from a user in a form_tag (non model input) and
> > process it into the controller.
> if you''re doing that then you don''t need to be messing
around with
> parsing strings. As part of the params you get a hash, so (by default)
> the respective components of the date are params[:date][:year],
> params[:date][:month] and params[:date][:day]. Just call to_i on these
> and pass them to Time.mktime or Date::civil
>
> Fred
>
>
> >
> > I''ve recently take the ridiculous ''long way around
the barn'' and
> > instaniated a DATE field object in a placebo table to accept the
> > value;
> > example;
> >        y = Badboy.new
> >        y.playdate = row[1]
> >        if @asset.mtxes.find(:first, :conditions => {:mdate =>
> > y.playdate })
> >          @asset.mtxes.find(:first, :conditions => {:mdate =>
> > y.playdate }).destroy
> >        end
> > Badboy is a table that''s simply being instantiated for the
brief time
> > that I need to borrow a WORKING datefield object.
> > Pretty crazy, huh?
> > Kathleen
> > On Jun 8, 12:39 am, "Greg Hauptmann"
<greg.hauptmann.r...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
> >> I found on the Ruby forum the following:
> >> Date.strptime(''28/03/2008'',
''%d/%m/%Y'')
> >>
> >>
> >>
> >> On Sun, Jun 8, 2008 at 3:37 PM, Phlip
<phlip2...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >>
> >>> It''s supposed to be strptime, to match Time.strftime
to _output_ a
> >>> date in
> >>> a
> >>> given format. Googling for that seems to yield either people
using
> >>> strptime
> >>> or
> >>> complaining about it.- Hide quoted text -
> >>
> >> - Show quoted text -
> > >
>
>
> >
>
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Michael Breen wrote:
> yeah, I tried in the console using the format that Greg is working
> with (dd/mm/yyyy). Your example works fine (mm/dd/yyyy).
Oi. Yay me for not paying closer attention. You''re right, mm/dd/yyyy 
does not get parsed by #to_date or #to_time. My apologies.

To the OT, because you know the format is mm/dd, flip them around first?

If I could get to my array#fold method we could do it in one, short 
line, but alas... my site is down. So temporary variable here we go...

components = ''14/12/1981''.split(''/'')
good_date = components[1] + ''/'' + # you get the idea...
good_date.to_date

I''m sure someone else has a nicer solution.
-- 
Posted via http://www.ruby-forum.com/.

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Hello,

I have been facing the same problem as Greg, but unfortunately neither
of these worked for me :(

dateStr = params[:startdate].to_s
logger.info "date - " + dateStr
startdate =Date.strptime(dateStr, ''%m/%d/%Y'').to_s

gives me -

date - 05/16/2008
ArgumentError: invalid date

Quite surprisingly, the dateStr being printed seems to be quite
correct yet the invalid date exception is thrown !!  The same thing
happens with the Date.parse too.. I have been trying to resolve this
for quite some time now and any help in this would be great !

~Titan

On Jun 11, 5:34 am, Daniel Waite
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Michael Breen wrote:
> > yeah, I tried in the console using the format that Greg is working
> > with (dd/mm/yyyy). Your example works fine (mm/dd/yyyy).
>
> Oi. Yay me for not paying closer attention. You''re right,
mm/dd/yyyy
> does not get parsed by #to_date or #to_time. My apologies.
>
> To the OT, because you know the format is mm/dd, flip them around first?
>
> If I could get to my array#fold method we could do it in one, short
> line, but alas... my site is down. So temporary variable here we go...
>
> components = ''14/12/1981''.split(''/'')
> good_date = components[1] + ''/'' + # you get the idea...
> good_date.to_date
>
> I''m sure someone else has a nicer solution.
> --
> Posted viahttp://www.ruby-forum.com/.
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On Jun 25, 2008, at 5:29 AM, Titan wrote:
>
> Hello,
>
> I have been facing the same problem as Greg, but unfortunately neither
> of these worked for me :(
>
> dateStr = params[:startdate].to_s
> logger.info "date - " + dateStr
> startdate =Date.strptime(dateStr, ''%m/%d/%Y'').to_s
Daniel''s tip to convert a string to a date should work for you:

startdate = dateStr.to_date
=> Fri, 16 May 2008

or

startdate = dateStr.to_time
=> Fri May 16 00:00:00 UTC 2008

Best.
Mike

>
>
> gives me -
>
> date - 05/16/2008
> ArgumentError: invalid date
>
> Quite surprisingly, the dateStr being printed seems to be quite
> correct yet the invalid date exception is thrown !!  The same thing
> happens with the Date.parse too.. I have been trying to resolve this
> for quite some time now and any help in this would be great !
>
> ~Titan
>
> On Jun 11, 5:34 am, Daniel Waite
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
>> Michael Breen wrote:
>>> yeah, I tried in the console using the format that Greg is working
>>> with (dd/mm/yyyy). Your example works fine (mm/dd/yyyy).
>>
>> Oi. Yay me for not paying closer attention. You''re right,
mm/dd/yyyy
>> does not get parsed by #to_date or #to_time. My apologies.
>>
>> To the OT, because you know the format is mm/dd, flip them around  
>> first?
>>
>> If I could get to my array#fold method we could do it in one, short
>> line, but alas... my site is down. So temporary variable here we  
>> go...
>>
>> components =
''14/12/1981''.split(''/'')
>> good_date = components[1] + ''/'' + # you get the
idea...
>> good_date.to_date
>>
>> I''m sure someone else has a nicer solution.
>> --
>> Posted viahttp://www.ruby-forum.com/.
>
> >

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Thanks, Mike. the to_time did work for me :). However to_date still
keeps throwing out the same error.

Just in case this is version specific, I''m using rails 1.1.6  and ruby
1.8.4.

~Titan



On Jun 25, 4:18 pm, Michael Breen
<hard...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Jun 25, 2008, at 5:29 AM, Titan wrote:
>
>
>
> > Hello,
>
> > I have been facing the same problem as Greg, but unfortunately neither
> > of these worked for me :(
>
> > dateStr = params[:startdate].to_s
> > logger.info "date - " + dateStr
> > startdate =Date.strptime(dateStr, ''%m/%d/%Y'').to_s
>
> Daniel''s tip to convert a string to a date should work for you:
>
> startdate = dateStr.to_date
> => Fri, 16 May 2008
>
> or
>
> startdate = dateStr.to_time
> => Fri May 16 00:00:00 UTC 2008
>
> Best.
> Mike
>
>
>
> > gives me -
>
> > date - 05/16/2008
> > ArgumentError: invalid date
>
> > Quite surprisingly, the dateStr being printed seems to be quite
> > correct yet the invalid date exception is thrown !!  The same thing
> > happens with the Date.parse too.. I have been trying to resolve this
> > for quite some time now and any help in this would be great !
>
> > ~Titan
>
> > On Jun 11, 5:34 am, Daniel Waite
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> > wrote:
> >> Michael Breen wrote:
> >>> yeah, I tried in the console using the format that Greg is
working
> >>> with (dd/mm/yyyy). Your example works fine (mm/dd/yyyy).
>
> >> Oi. Yay me for not paying closer attention. You''re right,
mm/dd/yyyy
> >> does not get parsed by #to_date or #to_time. My apologies.
>
> >> To the OT, because you know the format is mm/dd, flip them around
 
> >> first?
>
> >> If I could get to my array#fold method we could do it in one,
short
> >> line, but alas... my site is down. So temporary variable here we  
> >> go...
>
> >> components =
''14/12/1981''.split(''/'')
> >> good_date = components[1] + ''/'' + # you get the
idea...
> >> good_date.to_date
>
> >> I''m sure someone else has a nicer solution.
> >> --
> >> Posted viahttp://www.ruby-forum.com/.
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