I am using Magento Open Source Edition 2.4.2. I have a custom module where I have an admin configuration like below which is under 'Stores > Custom Menu'. enter image description here

In the system.xml, I have added the backend model for the 'dropdown field - Import Custom Data' as 'Vendor\Module\Model\Config\Backend\SetTimestamp'

Here is my 'SetTimestamp.php file':

     * @param \Magento\Framework\Model\Context $context
     * @param \Magento\Framework\Registry $registry
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $config
     * @param \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList
     * @param WriterInterface $configWriter
     * @param \Magento\Framework\Model\ResourceModel\AbstractResource $resource
     * @param \Magento\Framework\Data\Collection\AbstractDb $resourceCollection
     * @param array $data
    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        WriterInterface $configWriter,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->configWriter = $configWriter;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);

     * Change the Timestamp value to 0 if the Import Customer option gets changed
     * @return $this
    public function afterSave()
        $scope = $this->getData('scope');
        $scopeId = $this->getData('scope_id');

        if ($this->isValueChanged()) {

        return parent::afterSave();

But, this code doesn't set the value '0' instead it still has the long timestamp value.

Can anyone please help?

  • To see what's going on try to xdebug or var_dump the values of $scope, $scopeId and $this->isValueChanged(). May 26, 2021 at 18:31
  • isValueChanged() returns the true or false if the dropdown gets changed, $scope value is 'websites', $scopeId value is 1
    – Octopus
    May 27, 2021 at 3:29

1 Answer 1


Give a try with following.

Field xml code would be part of adminhtml/system.xml

<field id="timestamp" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="0" showInStore="0">

File: Vendor\MostSold\Model\Config\Backend\SetTimestamp.php


namespace Vendor\Module\Model\Config\Backend;

 * Class SetTimestamp
 * @package Vendor\Module\Model\Config\Backend
class SetTimestamp extends \Magento\Framework\App\Config\Value
     * @return SetTimestamp
    public function beforeSave()
        $value = $this->getValue();

        if ($this->isValueChanged() && $value !== '0') {
        return parent::beforeSave();

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