# RE: Date transform

**URL:** <https://www.ruby-forum.com/t/re-date-transform/94877>\
**Category:** Rails\
**Created:** [May 17, 2006, 12:32am UTC](https://www.ruby-forum.com/t/re-date-transform/94877 "2006-05-17T00:32:03Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 17, 2006, 12:32am UTC](https://www.ruby-forum.com/t/re-date-transform/94877/1 "2006-05-17T00:32:03Z")

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> i want my users to enter a date in “ddmmyyyy” format, do someone know  
> how may i transform it in “yyyy-mm-dd” in the controler  
> before i add it  
> to the base please?

See Time#strftime.

Regards,

Dan

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**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 17, 2006, 2:59am UTC](https://www.ruby-forum.com/t/re-date-transform/94877/2 "2006-05-17T02:59:08Z")

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Or have a look at my validates\_date\_time plugin

[http://svn.viney.net.nz/things/rails/plugins/validates\_date\_time](http://svn.viney.net.nz/things/rails/plugins/validates_date_time)

You’d need to add an extra regex to match ddmmyyy.

-Jonathan.

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**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 17, 2006, 12:13pm UTC](https://www.ruby-forum.com/t/re-date-transform/94877/3 "2006-05-17T12:13:31Z")

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Thks Dan and jonathan, i look your solution.

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<div class="post-metadata">

**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 17, 2006, 12:47pm UTC](https://www.ruby-forum.com/t/re-date-transform/94877/4 "2006-05-17T12:47:37Z")

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> > > > > “irong” == irong [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> In fact, i just want to transform the format : ‘ddmmyyyy’ in  
> ‘yyyy-mm-dd’ in php i create a fonction :

> Is there a command in ruby to do such things please?

irb(main):001:0\> str = “ddmmyyyy”  
=\> “ddmmyyyy”  
irb(main):002:0\> str.sub(/(…)(…)(…)/) {“#{$3}-#{$2}-#{$1}”}  
=\> “yyyy-mm-dd”  
irb(main):003:0\>

–  
Calle D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
[http://www.livejournal.com/users/cdybedahl/](http://www.livejournal.com/users/cdybedahl/)  
“Facts are for people with weak opinions.” – Lars Willför, I]M

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<div class="post-metadata">

**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 17, 2006, 2:39pm UTC](https://www.ruby-forum.com/t/re-date-transform/94877/5 "2006-05-17T14:39:19Z")

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string = ‘18052006’  
Date.new(\*string.scan(/(\d{2})(\d{2})(\d{4})/).flatten.reverse.map(&:to\_i))

-Jonathan.

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<div class="post-metadata">

**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 17, 2006, 12:33pm UTC](https://www.ruby-forum.com/t/re-date-transform/94877/6 "2006-05-17T12:33:58Z")

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In fact, i just want to transform the format : ‘ddmmyyyy’ in  
‘yyyy-mm-dd’ in php i create a fonction :

$variable = “12052006” ;

function datesql($variable)  
{  
$d1 = substr($variable, 4, 4);  
$d2 = substr($variable, 2, 2);  
$d3 = substr($variable, 0, 2);  
$variable = “$d1-$d2-$d3”;  
return $variable;  
}

it then return :

$variable = “2006-05-12” ;

Is there a command in ruby to do such things please?  
thks for your help

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<div class="post-metadata">

**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 18, 2006, 1:17am UTC](https://www.ruby-forum.com/t/re-date-transform/94877/7 "2006-05-18T01:17:30Z")

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Jonathan V. wrote:

> string = ‘18052006’  
> Date.new(\*string.scan(/(\d{2})(\d{2})(\d{4})/).flatten.reverse.map(&:to\_i))
> 
> -Jonathan.

The situation is when i create a person, in the form the user enter his  
date of birth in “ddmmyyyy” format and name, adress etc… Then i call  
in my controler an action called “create\_stagiaire”

which is :

def create\_stagiaire  
@stagiaire = Stagiaire.new(params[:stagiaire])  
if @stagiaire.save  
flash[:notice] = ‘Stagiaire was successfully created.’  
redirect\_to :action =\> ‘list’  
else  
render :action =\> ‘new’  
end  
end

By using ur code is the final code supposed to be something like that? (  
the column name for the date of birth is : dob )

def create\_person

```
string = params[:dob]
Ddn.new(*string.scan(/(\d{2})(\d{2})(\d{4})/).flatten.reverse.map(&:to_i))
@stagiaire = Stagiaire.new(params[:stagiaire],ddn)
if @stagiaire.save
  flash[:notice] = 'Stagiaire was successfully created.'
  redirect_to :action => 'list'
else
  render :action => 'new'
end

```

end

? sorry me soo noob in ror :(. I bought the book and done several tuto,  
but never done such things.