The default Magento 2 does not show FromDate or ToDate on the detail page from the assigned catalog price rule. If you want to show these dates on the detail page then follow the below steps.

Step 1: Create a registration file like Magemonkeys/Catalogrule/registration.php

<?php
\Magento\Framework\Component\ComponentRegistrar::register(
\Magento\Framework\Component\ComponentRegistrar::MODULE,
'Magemonkeys_Catalogrule',
__DIR__
);

<?php

\Magento\Framework\Component\ComponentRegistrar::register(

\Magento\Framework\Component\ComponentRegistrar::MODULE,

'Magemonkeys_Catalogrule',

__DIR__

);

Step 2: Create module file like Magemonkeys/Catalogrule/etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Magemonkeys_Catalogrule" setup_version="1.0.0"/>
</config>

<?xml version="1.0"?>

</config>

Step 3: Create block file like Magemonkeys/Catalogrule/Block/Rule.php

<?php
    namespace Magemonkeys\Catalogrule\Block;
    use Magento\Framework\View\Element\Template;
    use Magento\Framework\Registry;
    use Magento\Catalog\Model\Product;
    use Magento\Framework\Exception\LocalizedException;

    class Rule extends \Magento\Framework\View\Element\Template
    {
        protected $_registry;

        public function __construct(
            \Magento\Backend\Block\Template\Context $context,
            \Magento\CatalogRule\Model\ResourceModel\Rule\CollectionFactory $ruleFactory,
            \Magento\Framework\Registry $registry,
            array $data = []
        ) {
            $this->_registry = $registry;
            $this->_ruleFactory = $ruleFactory;
            parent::__construct($context, $data);
    }

    public function getCatalogRuleId()
    {
        //die('aaaaa');
        $catalogRuleCollection = $this->_ruleFactory->create()
            ->addFieldToFilter('is_active',1);

        return $catalogRuleCollection;

        $resultProductIds = [];

        foreach ($catalogRuleCollection as $catalogRule) {
            $productIdsAccToRule = $catalogRule->getMatchingProductIds();

            //echo json_encode($productIdsAccToRule); exit;

            $websiteId = $this->_storeManager->getStore()->getWebsiteId();

            foreach ($productIdsAccToRule as $productId => $ruleProductArray) {
                if (!empty($ruleProductArray[$websiteId])) {
                    $resultProductIds[$productId] = $catalogRule->getData();
                }
            }

            return $resultProductIds;
        }
    }

    public function getCurrentProduct()
    {        
        return $this->_registry->registry('current_product');
    } 

    public function getCatalogPriceRuleProductIds()
    {
        $storeManager = \Magento\Framework\App\ObjectManager::getInstance()->create(
             '\Magento\Store\Model\StoreManagerInterface'
        );
        $catalogRule = \Magento\Framework\App\ObjectManager::getInstance()->create(
             '\Magento\CatalogRule\Model\RuleFactory'
        );
        
        $websiteId = $storeManager->getStore()->getWebsiteId();//current Website Id

        $resultProductIds = [];
        $catalogRuleCollection = $catalogRule->create()->getCollection();
        $catalogRuleCollection->addIsActiveFilter(1);//filter for active rules only
        foreach ($catalogRuleCollection as $catalogRule) {
            $productIdsAccToRule = $catalogRule->getMatchingProductIds();
            foreach ($productIdsAccToRule as $productId => $ruleProductArray) {
                if (!empty($ruleProductArray[$websiteId])) {
                    $resultProductIds[$productId]['rulename'] = $catalogRule->getName();
                    $resultProductIds[$productId]['fromdate'] = $catalogRule->getFromDate();
                    $resultProductIds[$productId]['todate'] = $catalogRule->getToDate();
                }
            }
        }
        return $resultProductIds;
    }
}

<?php

namespace Magemonkeys\Catalogrule\Block;

use Magento\Framework\View\Element\Template;

use Magento\Framework\Registry;

use Magento\Catalog\Model\Product;

use Magento\Framework\Exception\LocalizedException;

class Rule extends \Magento\Framework\View\Element\Template

{

protected $_registry;

public function __construct(

\Magento\Backend\Block\Template\Context $context,

\Magento\CatalogRule\Model\ResourceModel\Rule\CollectionFactory $ruleFactory,

\Magento\Framework\Registry $registry,

array $data = []

) {

$this->_registry = $registry;

$this->_ruleFactory = $ruleFactory;

parent::__construct($context, $data);

}

public function getCatalogRuleId()

{

//die('aaaaa');

$catalogRuleCollection = $this->_ruleFactory->create()

->addFieldToFilter('is_active',1);

return $catalogRuleCollection;

$resultProductIds = [];

foreach ($catalogRuleCollection as $catalogRule) {

$productIdsAccToRule = $catalogRule->getMatchingProductIds();

//echo json_encode($productIdsAccToRule); exit;

$websiteId = $this->_storeManager->getStore()->getWebsiteId();

foreach ($productIdsAccToRule as $productId => $ruleProductArray) {

if (!empty($ruleProductArray[$websiteId])) {

$resultProductIds[$productId] = $catalogRule->getData();

}

return $resultProductIds;

}

public function getCurrentProduct()

{

return $this->_registry->registry('current_product');

}

public function getCatalogPriceRuleProductIds()

{

$storeManager = \Magento\Framework\App\ObjectManager::getInstance()->create(

'\Magento\Store\Model\StoreManagerInterface'

);

$catalogRule = \Magento\Framework\App\ObjectManager::getInstance()->create(

'\Magento\CatalogRule\Model\RuleFactory'

);

$websiteId = $storeManager->getStore()->getWebsiteId();//current Website Id

$resultProductIds = [];

$catalogRuleCollection = $catalogRule->create()->getCollection();

$catalogRuleCollection->addIsActiveFilter(1);//filter for active rules only

foreach ($catalogRuleCollection as $catalogRule) {

$productIdsAccToRule = $catalogRule->getMatchingProductIds();

foreach ($productIdsAccToRule as $productId => $ruleProductArray) {

if (!empty($ruleProductArray[$websiteId])) {

$resultProductIds[$productId]['rulename'] = $catalogRule->getName();

$resultProductIds[$productId]['fromdate'] = $catalogRule->getFromDate();

$resultProductIds[$productId]['todate'] = $catalogRule->getToDate();

}

return $resultProductIds;

}

Step 4: Create layout file like Magemonkeys/Catalogrule/view/frontend/layout/catalog_product_view.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright Â© 2018 Porto. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<page layout="2columns-right" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
         <referenceContainer name="product.info.main">
            <block class="Magemonkeys\Catalogrule\Block\Rule" name="rule_dates" template="Magemonkeys_Catalogrule::product/view/rule.phtml"/>
        </referenceContainer>
        <move element="rule_dates" destination="product.info.main" before="product.info.price"/>
    </body>
</page>

<?xml version="1.0"?>

<!--

/**

* See COPYING.txt for license details.

-->

<body>

</referenceContainer>

</body>

</page>

Step 5 : Create template file like Magemonkeys/Catalogrule/view/frontend/templates/product/view/rule.phtml

<?php
    $result=$block->getCatalogRuleId();
    $product=$block->getCurrentProduct();
    $collection=$block->getCatalogPriceRuleProductIds();
    $fromdate = '';
    $todate = '';
    $flag = false;
    foreach ($collection as $key => $collectionnew) {
        if ($product->getId() == $key) {
            $fromdate = $collectionnew['fromdate'];
            $todate = $collectionnew['todate'];
            $flag = true;
            break;
        }
    }
?>
<?php if($flag){ ?>
    <div class="promotions-date">
        <h3 class="promotions"><?php echo __("Promotion"); ?></h3>
        <span class="fromdate"><?php echo __("Start Date : "); ?><?php echo $fromdate; ?></span>
        <span class="todate"><?php echo __("End Date : "); ?><?php echo $todate; ?></span>
    </div>
<?php } ?>
<style type="text/css">
    .promotions-date { margin-bottom: 20px; }
    .promotions-date .promotions { margin-top: 0; color: #333; }
    .promotions-date span { display: block; }
</style>

<?php

$result=$block->getCatalogRuleId();

$product=$block->getCurrentProduct();

$collection=$block->getCatalogPriceRuleProductIds();

$fromdate = '';

$todate = '';

$flag = false;

foreach ($collection as $key => $collectionnew) {

if ($product->getId() == $key) {

$fromdate = $collectionnew['fromdate'];

$todate = $collectionnew['todate'];

$flag = true;

break;

}

<?php if($flag){ ?>

</div>

<?php } ?>

.promotions-date { margin-bottom: 20px; }

.promotions-date .promotions { margin-top: 0; color: #333; }

.promotions-date span { display: block; }

</style>

Step 6: Then run the below commands.

php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy
php bin/magento cache:flush

php bin/magento setup:upgrade

php bin/magento setup:static-content:deploy

php bin/magento cache:flush

That’s it.

Now clean cache and check your product detail page. Now your catalog price rule FromDate and ToDate should be visible.

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