如何将ZF2 DateSelect“ day”元素格式化为2位？

Question

I am wanting to do a date of birth composite drop-down for date of birth (ie three drop-downs - one for day, one for month, one for year). Helpfully, ZF2 comes with this element built in, called DateSelect

Here is how I am adding it to the form:

    $this->add([
        'name' => 'date_of_birth',
        'type' => 'DateSelect',
        'attributes' => [
            'required' => true,
            'value' => date('Y-m-d', strtotime('18 years ago')),
        ],
        'options' => [
            'label' => 'Date of Birth',
            'max_year' => date('Y', strtotime('18 years ago')),
        ],
    ]);

To render the form I am doing:

echo $this->form($form);

Anyway, the day element is being rendered in j format (ie day of the month without leading zeros 1 to 31 ).

How do I tell the element to render the day in d format (ie day of the month, 2 digits with leading zeros 01 to 31 )?

Answer 1

I have check source code from Zend\\Form\\Element\\DateSelect and it's view helper Zend\\Form\\View\\Helper\\FormDateSelect . The rendering date is on view helper, but it didn't use date('j') . It use IntlDateFormatter to format date, and it will output date format based on locale date format pattern given.

https://github.com/zendframework/zend-form/blob/release-2.2.0/src/View/Helper/FormDateSelect.php#L90

So, the solution we should pass the locale date format that use two digits day ( dd ). For country date format list, can be check here

https://en.wikipedia.org/wiki/Date_format_by_country

Based on the date format on list above, India use DD-MM-YY as date format. we can use this locale to get two digit day format,.

So, please use this on your view helper

echo $this->formDateSelect($form->get('date_of_birth'), IntlDateFormatter::MEDIUM, 'en_IN');

Answer 2

The view helper Zend\\Form\\View\\Helper\\FormDateSelect has a function getPattern that generates the patten by using the IntlDateFormatter class:

$intl           = new IntlDateFormatter($this->getLocale(), $this->dateType, IntlDateFormatter::NONE);
$this->pattern  = $intl->getPattern();

There did not appear to be any method of setting a pattern at element level, so I have extended this view helper allowing me to specify my own pattern:

<?php
namespace RPK\Form\View\Helper;

use Zend\Form\View\Helper\FormDateSelect as ZendFormDateSelect;

class FormDateSelect extends ZendFormDateSelect
{
    /**
     * Parse the pattern
     *
     * @param  bool $renderDelimiters
     * @return array
     */
    protected function parsePattern($renderDelimiters = true)
    {
        //Replace `day` value of "d" with "dd"
        $pattern = parent::parsePattern($renderDelimiters);
        if($pattern['day'] === 'd') {
            $pattern['day'] = 'dd';
        }
        return $pattern;
    }
}

Very basically, this takes the returned pattern array ( ['day'=>'d', 'month' => 'MMMM', 'year' => 'yyyy'] ), checks if the value of day is a single letter "d" and, if so, replaces it with a double-d.