我在 Symfony 2.4 项目中使用 Twig Intl Extension 来本地化日期：
{{ post.published_at|localizeddate('short', 'none', locale) }}
这很好用，但不会以yyyy 格式显示全年，而是使用yy 格式。
这样，2013 年 12 月 31 日将根据区域设置显示为 31/12/2013 或 12/31/2013，而不是 31/12/13 或 31/12/13。
有没有办法在本地化日期中使用 4 位数年份？
【问题讨论】：
我终于成功了！
我以这种方式扩展了默认的 Twig Intl Extension：
<?php
namespace Acme\DemoBundle\Twig;
class AcmeIntlExtension extends \Twig_Extensions_Extension_Intl
{
public function getFilters()
{
return array(
new \Twig_SimpleFilter('localizeddate', array($this, 'twigLocalizedDateFilter'), array('needs_environment' => true)),
);
}
public function twigLocalizedDateFilter($env, $date, $dateFormat = 'medium', $timeFormat = 'medium', $locale = null, $timezone = null, $format = null)
{
$date = twig_date_converter($env, $date, $timezone);
$formatValues = array(
'none' => \IntlDateFormatter::NONE,
'short' => \IntlDateFormatter::SHORT,
'medium' => \IntlDateFormatter::MEDIUM,
'long' => \IntlDateFormatter::LONG,
'full' => \IntlDateFormatter::FULL,
);
$formatter = \IntlDateFormatter::create(
$locale,
$formatValues[$dateFormat],
$formatValues[$timeFormat],
$date->getTimezone()->getName(),
\IntlDateFormatter::GREGORIAN,
$format
);
if ($format === null) {
// Replace yy to y (but yyy should be kept yyy, and yyyy kept as yyyy)
// This way, years are NEVER shown as "yy" (eg. 14), but always like "yyyy" (eg. 2014)
$pattern = preg_replace(':(^|[^y])y{2,2}([^y]|$):', '$1y$2', $formatter->getPattern());
$formatter->setPattern($pattern);
}
return $formatter->format($date->getTimestamp());
}
}
它在我的 Symfony 的 app/config.yml 文件中声明：
services:
acme.twig.extension.intl:
class: Acme\DemoBundle\Twig\AcmeIntlExtension
tags:
- { name: twig.extension }
我将默认模式更改为将“yy”替换为“y”（这是 4 位数年份的格式，如下所述：http://userguide.icu-project.org/formatparse/datetime）。
这样，它适用于所有格式和所有语言环境。
【讨论】：
您扩展 intl 扩展的解决方案很好，但您可以更轻松地做到这一点。如果您深入查看文档，您会发现该扩展有一个 format 参数。所以你可以这样做：
{{ post.published_at|localizeddate('short', 'none', locale, null, 'd/m/y HH:mm') }}
格式遵循 ICU 格式指南。对于 4 位数年份，您可以使用 y 或 yyyy。完整文档：http://userguide.icu-project.org/formatparse/datetime
希望对你有帮助。
【讨论】：
对 Michaël Perrin 的回答进行了更改，以便能够通过将 _year 添加到日期格式来使用新旧方式。
使用以下命令创建文件 app/src/Myproject/MyBundle/Twig/Extension/IntlExtension.php：
<?php
namespace Myproject\MyBundle\Twig\Extension;
/**
* Extension of Twig Intl Extension to add support fo showing 4-digit year. Add
* '_year' to the date format for it to work, i.e. short_year instead of short.
*/
class IntlExtension extends \Twig_Extensions_Extension_Intl
{
/**
* A new filter must be added for this extension to work. Since this extension
* extends an existing one, the filter should be loaded after the original one.
*
* @return array
*/
public function getFilters()
{
$filters = [];
// Add all filters but the localizeddate created by the parent.
foreach (parent::getFilters() as $filter) {
if ('localizeddate' !== $filter->getName()) {
$filters[] = $filter;
}
}
// Add custom version of 'localizeddate' which adds support showing 4-digit years.
$filters[] = new \Twig_SimpleFilter('localizeddate', array($this, 'twigLocalizedDateFilter'), array('needs_environment' => true));
return $filters;
}
/**
* If the date format has _year in it, the format returned by Intl, will be
* changed to show a 4-digit year.
*
* @param \Twig_Environment $env
* @param \DateTime $date
* @param string $dateFormat
* @param string $timeFormat
* @param string $locale
* @param string $timezone
* @param string $format
* @return string
*/
public function twigLocalizedDateFilter(\Twig_Environment $env, $date, $dateFormat = 'medium', $timeFormat = 'medium', $locale = null, $timezone = null, $format = null, $calendar = 'gregorian')
{
$date = twig_date_converter($env, $date, $timezone);
$formatValues = array(
'none' => \IntlDateFormatter::NONE,
'short' => \IntlDateFormatter::SHORT,
'medium' => \IntlDateFormatter::MEDIUM,
'long' => \IntlDateFormatter::LONG,
'full' => \IntlDateFormatter::FULL,
);
$formatter = \IntlDateFormatter::create(
$locale,
$formatValues[$this->getDateFormat($dateFormat)],
$formatValues[$timeFormat],
PHP_VERSION_ID >= 50500 ? $date->getTimezone() : $date->getTimezone()->getName(),
'gregorian' === $calendar ? \IntlDateFormatter::GREGORIAN : \IntlDateFormatter::TRADITIONAL,
$format
);
if ($format === null && $this->showFullYear($dateFormat)) {
// Replace yy to y (but yyy should be kept yyy, and yyyy kept as yyyy)
// This way, years are NEVER shown as "yy" (eg. 14), but always like "yyyy" (eg. 2014)
$pattern = preg_replace(':(^|[^y])y{2,2}([^y]|$):', '$1y$2', $formatter->getPattern());
$formatter->setPattern($pattern);
}
return $formatter->format($date->getTimestamp());
}
/**
* If the given date format has _year in it, true is returned, otherwise false.
*
* @param string $dateFormat
* @return boolean
*/
protected function showFullYear($dateFormat)
{
return (strpos($dateFormat, '_year') !== false);
}
/**
* The date format will be returned without the part '_year' if it contains it.
* @param string $dateFormat
* @return string
*/
protected function getDateFormat($dateFormat)
{
return str_replace('_year', '', $dateFormat);
}
}
当然还有 app/config/config.yml 中的添加
services:
myproject.twig.extension.intl:
class: Myproject\MyBundle\Twig\Extension\IntlExtension
tags:
- { name: twig.extension }
【讨论】：
试试这个：
{{ post.published_at|localizeddate('d/m/Y', 'none', locale) }}
您可以使用自己的格式和特殊的 pkaceholders，例如 Y 表示 YYYY 日期格式，查看有关 localizeddate 过滤器的文档。
【讨论】：