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在Magento 2中通过配置设置cron时间的步骤：

步骤1：首先您需要在 以下路径中添加crontab.xml

app\code\Vendor\Extension\etc\crontab.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">
    <group id="default">
       <job instance="Vendor\Extension\Cron\Cronfile" method="execute" name="my_cron_job">
            <config_path>crontab/default/jobs/my_cron_job/schedule/cron_expr</
        </job>
    </group>
</config>

步骤2： 需要在系统上添加新组.xml路径如下

app\code\Vendor\Extension\etc\adminhtml\system.xml

<group id="configurable_cron" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="0">
    <label>Cron Settings</label>
    <field id="frequency" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="0" showInStore="0">
        <label>Frequency</label>
        <source_model>Magento\Cron\Model\Config\Source\Frequency</source_model>
        <backend_model>Vendor\Extension\Model\Config\Cronconfig</backend_model>
    </field>
    <field id="time" translate="label comment" sortOrder="2" type="time" showInDefault="1" showInWebsite="1" showInStore="1">
        <label>Start Time</label>
    </field>
</group>

第 3 步：现在在 以下路径中添加 Cronconfig.php

app\code\Vendor\Extension\Model\Config\Cronconfig.php

<?php
 
namespace Vendor\Extension\Model\Config;
 
class Cronconfig extends \Magento\Framework\App\Config\Value
{
    const CRON_STRING_PATH = 'crontab/default/jobs/my_cron_job/schedule/cron_expr';
    const CRON_MODEL_PATH = 'crontab/default/jobs/my_cron_job/run/model';
   
     /**
     * @var \Magento\Framework\App\Config\ValueFactory
     */
 
    protected $_configValueFactory;
 
    /**
     * @var mixed|string
     */
 
    protected $_runModelPath = '';
 
    /**
     * CronConfig1 constructor.
     * @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 \Magento\Framework\App\Config\ValueFactory $configValueFactory
     * @param \Magento\Framework\Model\ResourceModel\AbstractResource|null $resource
     * @param \Magento\Framework\Data\Collection\AbstractDb|null $resourceCollection
     * @param string $runModelPath
     * @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,
        \Magento\Framework\App\Config\ValueFactory $configValueFactory,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        $runModelPath = '',
        array $data = [])
    {
        $this->_runModelPath = $runModelPath;
        $this->_configValueFactory = $configValueFactory;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }
 
    /**
     * @return CronConfig1
     * @throws \Exception
     */
 
    public function afterSave()
    {
        $time = $this->getData('groups/configurable_cron/fields/time/value');
        $frequency = $this->getData('groups/configurable_cron/fields/frequency/value');
        $cronExprArray = [
            intval($time[1]),
            intval($time[0]),
            $frequency == \Magento\Cron\Model\Config\Source\Frequency::CRON_MONTHLY ? '1' : '*',
            '*',
            $frequency == \Magento\Cron\Model\Config\Source\Frequency::CRON_WEEKLY ? '1' : '*',
        ];
 
        $cronExprString = join(' ', $cronExprArray);
 
        try
        {
            $this->_configValueFactory->create()->load(
                self::CRON_STRING_PATH,
                'path'
            )->setValue(
                $cronExprString
            )->setPath(
                self::CRON_STRING_PATH
            )->save();
            $this->_configValueFactory->create()->load(
                self::CRON_MODEL_PATH,
                'path'
            )->setValue(
                $this->_runModelPath
            )->setPath(
                self::CRON_MODEL_PATH
            )->save();
        }
        catch (\Exception $e)
        {
            throw new \Exception(__('Some Thing Want Wrong , We can\'t save the cron expression.'));
        }
        return parent::afterSave();
    }
}

步骤4：现在在 以下路径中添加Cronfile.php

app\code\Vendor\Extension\Cron\Cronfile.php

<?php
 
namespace Vendor\Extension\Cron;
 
class Cronfile
{
    public function execute()
    {
        //Add your cron code.
    }
}

结论：

因此，现在所有人都可以通过Magento 2中的配置设置Cron Time。