This is a bug. Try following way for the fix:
app/code/SR/MagentoCommunity/etc/di.xml
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<type name="Magento\Ui\Component\Form\Element\DataType\Date">
<plugin name="SR_MagentoCommunity::allow_format_from_config"
type="SR\MagentoCommunity\Plugin\Ui\Component\Form\Element\DataType\Date" sortOrder="1"/>
</type>
</config>
app/code/SR/MagentoCommunity/Plugin/Ui/Component/Form/Element/DataType/Date.ph
code>
<?php
namespace SR\MagentoCommunity\Plugin\Ui\Component\Form\Element\DataType;
class Date
{
public function aroundPrepare(
\Magento\Ui\Component\Form\Element\DataType\Date $subject,
\Closure $proceed
) {
$configOrig = $subject->getData('config');
$proceed();
$config = $subject->getData('config');
if (isset($configOrig['options']) && isset($configOrig['options']['dateFormat'])) {
$config['options']['dateFormat'] = $configOrig['options']['dateFormat'];
}
if (isset($configOrig['options']) && isset($configOrig['options']['timeFormat'])) {
$config['options']['timeFormat'] = $configOrig['options']['timeFormat'];
}
$subject->setData('config', $config);
}
}
[Update]
app/code/SR/MagentoCommunity/etc/adminhtml/di.xml
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<preference for="Magento\SalesRule\Controller\Adminhtml\Promo\Quote\Save" type="SR\MagentoCommunity\Controller\Adminhtml\Promo\Quote\Save"/>
</config>
app/code/SR/MagentoCommunity/Controller/Adminhtml/Promo/Quote/Save.php
<?php
namespace SR\MagentoCommunity\Controller\Adminhtml\Promo\Quote;
class Save extends \Magento\SalesRule\Controller\Adminhtml\Promo\Quote\Save
{
/**
* @var \Magento\Framework\Stdlib\DateTime\Filter\DateTime
*/
private $dateTimeFilter;
/**
* Save constructor.
*
* @param \Magento\Backend\App\Action\Context $context
* @param \Magento\Framework\Registry $coreRegistry
* @param \Magento\Framework\App\Response\Http\FileFactory $fileFactory
* @param \Magento\Framework\Stdlib\DateTime\Filter\Date $dateFilter
* @param \Magento\Framework\Stdlib\DateTime\Filter\DateTime $dateTimeFilter
*/
public function __construct(
\Magento\Backend\App\Action\Context $context,
\Magento\Framework\Registry $coreRegistry,
\Magento\Framework\App\Response\Http\FileFactory $fileFactory,
\Magento\Framework\Stdlib\DateTime\Filter\Date $dateFilter,
\Magento\Framework\Stdlib\DateTime\Filter\DateTime $dateTimeFilter
) {
parent::__construct($context, $coreRegistry, $fileFactory, $dateFilter);
$this->dateTimeFilter = $dateTimeFilter;
}
/**
* Promo quote save action
*
* @return void
* @SuppressWarnings(PHPMD.CyclomaticComplexity)
* @SuppressWarnings(PHPMD.NPathComplexity)
*/
public function execute()
{
if ($this->getRequest()->getPostValue()) {
try {
/** @var $model \Magento\SalesRule\Model\Rule */
$model = $this->_objectManager->create(\Magento\SalesRule\Model\Rule::class);
$this->_eventManager->dispatch(
'adminhtml_controller_salesrule_prepare_save',
['request' => $this->getRequest()]
);
$data = $this->getRequest()->getPostValue();
$filterValues = ['from_date' => $this->dateTimeFilter];
if ($this->getRequest()->getParam('to_date')) {
$filterValues['to_date'] = $this->dateTimeFilter;
}
$inputFilter = new \Zend_Filter_Input(
$filterValues,
[],
$data
);
$data = $inputFilter->getUnescaped();
$id = $this->getRequest()->getParam('rule_id');
if ($id) {
$model->load($id);
if ($id != $model->getId()) {
throw new \Magento\Framework\Exception\LocalizedException(__('The wrong rule is specified.'));
}
}
$session = $this->_objectManager->get(\Magento\Backend\Model\Session::class);
$validateResult = $model->validateData(new \Magento\Framework\DataObject($data));
if ($validateResult !== true) {
foreach ($validateResult as $errorMessage) {
$this->messageManager->addErrorMessage($errorMessage);
}
$session->setPageData($data);
$this->_redirect('sales_rule/*/edit', ['id' => $model->getId()]);
return;
}
if (isset(
$data['simple_action']
) && $data['simple_action'] == 'by_percent' && isset(
$data['discount_amount']
)
) {
$data['discount_amount'] = min(100, $data['discount_amount']);
}
if (isset($data['rule']['conditions'])) {
$data['conditions'] = $data['rule']['conditions'];
}
if (isset($data['rule']['actions'])) {
$data['actions'] = $data['rule']['actions'];
}
unset($data['rule']);
$model->loadPost($data);
$useAutoGeneration = (int)(
!empty($data['use_auto_generation']) && $data['use_auto_generation'] !== 'false'
);
$model->setUseAutoGeneration($useAutoGeneration);
$session->setPageData($model->getData());
$model->save();
$this->messageManager->addSuccessMessage(__('You saved the rule.'));
$session->setPageData(false);
if ($this->getRequest()->getParam('back')) {
$this->_redirect('sales_rule/*/edit', ['id' => $model->getId()]);
return;
}
$this->_redirect('sales_rule/*/');
return;
} catch (\Magento\Framework\Exception\LocalizedException $e) {
$this->messageManager->addErrorMessage($e->getMessage());
$id = (int)$this->getRequest()->getParam('rule_id');
if (!empty($id)) {
$this->_redirect('sales_rule/*/edit', ['id' => $id]);
} else {
$this->_redirect('sales_rule/*/new');
}
return;
} catch (\Exception $e) {
$this->messageManager->addErrorMessage(
__('Something went wrong while saving the rule data. Please review the error log.')
);
$this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
$this->_objectManager->get(\Magento\Backend\Model\Session::class)->setPageData($data);
$this->_redirect('sales_rule/*/edit', ['id' => $this->getRequest()->getParam('rule_id')]);
return;
}
}
$this->_redirect('sales_rule/*/');
}
}