DateTimeFormatter.php

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<?php
namespace Magento\Framework\Stdlib\DateTime;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;

class DateTimeFormatter implements DateTimeFormatterInterface
{
    protected $useIntlFormatObject;

    private $localeResolver;

    public function __construct(
        $useIntlFormatObject = null
    ) {
        $this->useIntlFormatObject = (null === $useIntlFormatObject)
            ? !defined('HHVM_VERSION')
            : $useIntlFormatObject;
    }

    private function getLocaleResolver()
    {
        if ($this->localeResolver === null) {
            $this->localeResolver = \Magento\Framework\App\ObjectManager::getInstance()->get(
                \Magento\Framework\Locale\ResolverInterface::class
            );
        }
        return $this->localeResolver;
    }

    public function formatObject($object, $format = null, $locale = null)
    {
        $locale = (null === $locale) ? $this->getLocaleResolver()->getLocale() : $locale;
        if ($this->useIntlFormatObject) {
            return \IntlDateFormatter::formatObject($object, $format, $locale);
        }
        return $this->doFormatObject($object, $format, $locale);
    }

    protected function doFormatObject($object, $format = null, $locale = null)
    {
        $pattern = $dateFormat = $timeFormat = $calendar = null;

        if (is_array($format)) {
            list($dateFormat, $timeFormat) = $format;
        } elseif (is_numeric($format)) {
            $dateFormat = $format;
        } elseif (is_string($format) || null == $format) {
            $dateFormat = $timeFormat = \IntlDateFormatter::MEDIUM;
            $pattern = $format;
        } else {
            throw new LocalizedException(
                new Phrase('The format type is invalid. Verify the format type and try again.')
            );
        }

        $timezone = $object->getTimezone();
        if ($object instanceof \IntlCalendar) {
            $timezone = $timezone->toDateTimeZone();
        }
        $timezone = $timezone->getName();

        if ($timezone === '+00:00') {
            $timezone = 'UTC';
        } elseif ($timezone[0] === '+' || $timezone[0] === '-') { // $timezone[0] is first symbol of string
            $timezone = 'GMT' . $timezone;
        }

        return (new \IntlDateFormatter($locale, $dateFormat, $timeFormat, $timezone, $calendar, $pattern))
            ->format($object);
    }
}