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<?php
/**
 * This file is part of Namespace for Magento.
 *
 * @license All rights reserved
 * @author Phuong LE <[email protected]> <@>
 * @category Namespace
 * @package Namespace_Core
 * @copyright Copyright (c) 2016 Agence Soon (http://www.agence-soon.fr)
 */

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<?php
/**
 * Copyright © 2016 Soon. All rights reserved.
 */

/** Location : app/code/Namespace/MyModule **/

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::THEME,
    'frontend/Namespace/MyThemeName',

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Price Product excluding tax set in BO  :  8,25 €
Tax rate : 10 %

For Magento the Tax Amount is  0,83 €

But 8,25 *  10/100 = 0,825 €
The final Price will be  9,08 €

Why Magento return 0,83 € ?

0-Sony

<?php
/**
 * @license http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 * @author Phuong LE <[email protected]> <@>
 * @copyright Copyright (c) 2016 Agence Soon (http://www.agence-soon.fr)
 */

namespace Namespace\Cms\Setup;

use Magento\Cms\Model\Page;

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<?php 
/**
 * @license http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 * @author Phuong LE <[email protected]> <@>
 * @copyright Copyright (c) 2016 Agence Soon (http://www.agence-soon.fr)
 */

namespace NameSpace\Customer\Setup;

use Magento\Customer\Api\CustomerMetadataInterface;

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<config>
    <frontend>
        <events>
            <!-- Disable native module observer -->
            <your_event_name>
                <observers>
                    <observer_name>
                        <type>disabled</type>
                    </observer_name>
                </observers>

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<?php 
/** Assume you get your product in your block.*/
$product = $this->product;

$finalPrice = $product->getPriceInfo()->getPrice('final_price')->getAmount()->getValue();
/** Note for best practice , it's better to call your helper in your block **/
echo $this->helper('Magento\Framework\Pricing\Helper\Data')->currency(number_format($finalPrice,2), true , false);
?>

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<?php
/**
 * @license http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 * @author Phuong LE <[email protected]> <@>
 * @copyright Copyright (c) 2017 Agence Soon (http://www.agence-soon.fr)
 */

namespace MyVendor\MyModule\Observer;

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<?php 

try {

/* @var $installer Mage_Core_Model_Resource_Setup */
    $installer = $this;
   
    $customDir = Mage::getBaseDir('var') . DS . 'my' . DS . 'awesome' . DS . 'folder';
    $ioFile = new Varien_Io_File();
    $ioFile->checkAndCreateFolder($customDir);

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<?php

$time = Mage::getModel('core/date')->timestamp(time());
$date = new Zend_Date($time, Zend_Date::TIMESTAMP);
$subday = 1;

$date->subDay($subday); // -1 day
$date->addDay(1); // +1 day