Where can the DateTime extension class be downloaded and included in PHP code?

The DateTime extension class can be downloaded from the official PHP website or through a package manager like Composer. Once downloaded, the extension class can be included in PHP code using the `require_once` or `include_once` function to import the necessary files. 

// Include the DateTime extension class
require_once 'path/to/datetime_extension_class.php';

// Your PHP code using the DateTime extension class
$date = new DateTimeExtension();
echo $date->format('Y-m-d H:i:s');

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DateTime extension class download include PHP code

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