Convert string to DateTime object for languages other than English

app/code/Magento/Newsletter/Model/Queue.php

@@ -7,6 +7,7 @@
 
 use Magento\Framework\App\TemplateTypesInterface;
 use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
+use Magento\Framework\Stdlib\DateTime\Timezone\LocalizedDateToUtcConverterInterface;
 
 /**
  * Newsletter queue model.
@@ -117,6 +118,11 @@ class Queue extends \Magento\Framework\Model\AbstractModel implements TemplateTy
      */
     private $timezone;
 
+    /**
+     * @var LocalizedDateToUtcConverterInterface
+     */
+    private $utcConverter;
+
     /**
      * @param \Magento\Framework\Model\Context $context
      * @param \Magento\Framework\Registry $registry
@@ -144,7 +150,8 @@ public function __construct(
         \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
         \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
         array $data = [],
-        TimezoneInterface $timezone = null
+        TimezoneInterface $timezone = null,
+        LocalizedDateToUtcConverterInterface $utcConverter = null
     ) {
         parent::__construct(
             $context,
@@ -159,9 +166,10 @@ public function __construct(
         $this->_problemFactory = $problemFactory;
         $this->_subscribersCollection = $subscriberCollectionFactory->create();
         $this->_transportBuilder = $transportBuilder;
-        $this->timezone = $timezone ?: \Magento\Framework\App\ObjectManager::getInstance()->get(
-            TimezoneInterface::class
-        );
+
+        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
+        $this->timezone = $timezone ?: $objectManager->get(TimezoneInterface::class);
+        $this->utcConverter = $utcConverter ?? $objectManager->get(LocalizedDateToUtcConverterInterface::class);
     }
 
     /**
@@ -196,7 +204,7 @@ public function setQueueStartAtByString($startAt)
         if ($startAt === null || $startAt == '') {
             $this->setQueueStartAt(null);
         } else {
-            $this->setQueueStartAt($this->timezone->convertConfigTimeToUtc($startAt));
+            $this->setQueueStartAt($this->utcConverter->convertLocalizedDateToUtc($startAt));
         }
         return $this;
     }

app/etc/di.xml

@@ -146,6 +146,7 @@
     <preference for="Magento\Framework\Locale\FormatInterface" type="Magento\Framework\Locale\Format" />
     <preference for="Magento\Framework\Locale\ResolverInterface" type="Magento\Framework\Locale\Resolver" />
     <preference for="Magento\Framework\Stdlib\DateTime\TimezoneInterface" type="Magento\Framework\Stdlib\DateTime\Timezone" />
+    <preference for="Magento\Framework\Stdlib\DateTime\Timezone\LocalizedDateToUtcConverterInterface" type="Magento\Framework\Stdlib\DateTime\Timezone\LocalizedDateToUtcConverter" />
     <preference for="Magento\Framework\Communication\ConfigInterface" type="Magento\Framework\Communication\Config" />
     <preference for="Magento\Framework\Module\ResourceInterface" type="Magento\Framework\Module\ModuleResource" />
     <preference for="Magento\Framework\Pricing\Amount\AmountInterface" type="Magento\Framework\Pricing\Amount\Base" />

lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php

@@ -85,23 +85,23 @@ public function __construct(
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getDefaultTimezonePath()
     {
         return $this->_defaultTimezonePath;
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getDefaultTimezone()
     {
         return 'UTC';
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getConfigTimezone($scopeType = null, $scopeCode = null)
     {
@@ -113,7 +113,7 @@ public function getConfigTimezone($scopeType = null, $scopeCode = null)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getDateFormat($type = \IntlDateFormatter::SHORT)
     {
@@ -125,7 +125,7 @@ public function getDateFormat($type = \IntlDateFormatter::SHORT)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getDateFormatWithLongYear()
     {
@@ -137,7 +137,7 @@ public function getDateFormatWithLongYear()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getTimeFormat($type = \IntlDateFormatter::SHORT)
     {
@@ -149,15 +149,15 @@ public function getTimeFormat($type = \IntlDateFormatter::SHORT)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getDateTimeFormat($type)
     {
         return $this->getDateFormat($type) . ' ' . $this->getTimeFormat($type);
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function date($date = null, $locale = null, $useTimezone = true, $includeTime = true)
     {
@@ -191,7 +191,7 @@ public function date($date = null, $locale = null, $useTimezone = true, $include
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function scopeDate($scope = null, $date = null, $includeTime = false)
     {
@@ -204,7 +204,7 @@ public function scopeDate($scope = null, $date = null, $includeTime = false)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function formatDate($date = null, $format = \IntlDateFormatter::SHORT, $showTime = false)
     {
@@ -218,7 +218,7 @@ public function formatDate($date = null, $format = \IntlDateFormatter::SHORT, $s
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function scopeTimeStamp($scope = null)
     {
@@ -231,7 +231,7 @@ public function scopeTimeStamp($scope = null)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function isScopeDateInInterval($scope, $dateFrom = null, $dateTo = null)
     {

lib/internal/Magento/Framework/Stdlib/DateTime/Timezone/LocalizedDateToUtcConverter.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\Stdlib\DateTime\Timezone;
+
+use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
+use Magento\Framework\Locale\ResolverInterface;
+use Magento\Framework\App\Config\ScopeConfigInterface;
+
+/**
+ * Class LocalizedDateToUtcConverter
+ */
+class LocalizedDateToUtcConverter implements LocalizedDateToUtcConverterInterface
+{
+    /**
+     * Contains default date format
+     *
+     * @var string
+     */
+    private $defaultFormat = 'Y-m-d H:i:s';
+
+    /**
+     * @var TimezoneInterface
+     */
+    private $timezone;
+
+    /**
+     * @var ResolverInterface
+     */
+    private $localeResolver;
+
+    /**
+     * LocalizedDateToUtcConverter constructor.
+     *
+     * @param ResolverInterface $localeResolver
+     */
+    public function __construct(
+        TimezoneInterface $timezone,
+        ResolverInterface $localeResolver
+    )
+    {
+        $this->timezone = $timezone;
+        $this->localeResolver = $localeResolver;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function convertLocalizedDateToUtc($date)
+    {
+        $configTimezone = $this->timezone->getConfigTimezone();
+        $locale = $this->localeResolver->getLocale();
+
+        $formatter = new \IntlDateFormatter(
+            $locale,
+            \IntlDateFormatter::MEDIUM,
+            \IntlDateFormatter::MEDIUM,
+            $configTimezone
+        );
+
+        $localTimestamp = $formatter->parse($date);
+        $gmtTimestamp = $this->timezone->date($localTimestamp)->getTimestamp();
+        $formattedUniversalTime = date($this->defaultFormat, $gmtTimestamp);
+
+        $date = new \DateTime($formattedUniversalTime, new \DateTimeZone($configTimezone));
+        $date->setTimezone(new \DateTimeZone('UTC'));
+
+        return $date->format($this->defaultFormat);
+    }
+}

lib/internal/Magento/Framework/Stdlib/DateTime/Timezone/LocalizedDateToUtcConverterInterface.php

@@ -0,0 +1,17 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\Stdlib\DateTime\Timezone;
+
+interface LocalizedDateToUtcConverterInterface
+{
+    /**
+     * @param string $data
+     * @return string
+     */
+    public function convertLocalizedDateToUtc($date);
+}

lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php

@@ -80,6 +80,7 @@ public function scopeDate($scope = null, $date = null, $includeTime = false);
 
     /**
      * Get scope timestamp
+     *
      * Timestamp will be built with scope timezone settings
      *
      * @param   mixed $scope