Magento 2 : get timestamp of your store time zone and sub/add day

mydate.php

<?php 

namespace Namespace\Module\Block;

use Magento\Framework\Stdlib\DateTime\DateTime;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
use Magento\Framework\View\Element\Template;

class mydate extends Template
  
  /**
     * @var DateTime
     */
    private $date;
    /**
     * @var TimezoneInterface
     */
    private $timezone;
  
   public function __construct(
        Template\Context $context,
        DateTime $date,
        TimezoneInterface $timezone,
        array $data
    ) {
        parent::__construct($context, $data);
        $this->date = $date;
        $this->timezone = $timezone;
    }

  public function getStoreTimestamp()
  {
     // for get current time according to time zone
     $time = $this->timezone->scopeTimeStamp();
    
    // you can use \Zend_Date to work with date like this :
    $date = new \Zend_Date($time, \Zend_Date::TIMESTAMP);
    $date->subDay(1); // -1 day
    $date->addDay(1); // +1 day
    
    // you can use time with DateTime
    $date = (new \DateTime())->setTimestamp($time);
    $date->sub(new \DateInterval('P1D')); // -1 day
    $date->add(new \DateInterval('P1D')); // +1 day  
    
  }