Setting timezone within module?

Question

PHP

Is it possible in php to set the default timezone only within the same file or class?
The fact is that I have some module that calculates taking into account the user's time. date_default_timezone_set()I can’t use it, as it will lead to incorrect work of the rest of the code. And in the module, when creating an DateTimeobject (which occurs in a dozen different places), it is not very convenient to set a zone for it every time. In addition, given that the module uses several third-party classes in its work, you will have to redo them and implement zone transfer from the class using them. Obviously, this is not the best solution.
Please tell me what is the best thing to do in this situation.

Answer 1

All this is done at the application level. This is an architectural problem ..
1. You must have a config in each module or a place from where you will take the time zone
.

src/modules/user
                           - timezone.ini 
src/modules/customers
                           - timezone.ini 
src/modules/admin
                           - timezone.ini

2. You must have a module entry point that accesses all of the component's internals.
For example, if modules are not called directly, but are used to interact throughout the system... then I would make a Dependency Injection Container

src/modules/user/
                           - DIC.php
                           - ...
                           - UserController.php
                           - timezone.ini
src/
    - TimeZone.php

# timezone.ini
timezone=Europe/Kiev

# TimeZone.php
class TimeZone() {
    
    private $tz;
    
    public __constructor($tz) {
    	$this->tz = $tz;
  }

    public function getDateTime() {
        $currentDate = (new \DateTime())->format('Y-m-d H:i:s');
    $tz = new DateTimeZone($config['timezone']);
    $date = new DateTime($currentDate);
    $date->setTimezone($this->tz);
    return $date;
    }
}

# DIC.php

use src/TimeZone;
use UserController;

class DIC {
  
  private function getTimeZone() {
      $config = parse_ini_file('timezone.ini');
    retrun new TimeZone($config['timezone']);
  }

  public function getUserModule() {
    return new UserController(
      ($this->getTimeZone()->getDateTime())
    )
  }
}

# UserController.php
class UserController {
  
  protected $date;

  public function __constructor(\DateTime $date) {
    $this->date = $date // Можно расшарить между внутренними компонентами модуля
  }
}

3. How to use?

# У каждого компонента параметр со своей временной меткой
$dic = new DIC();
$userModule = $dic->getUserModule();
$customerModule = $dic->getCustomerModule();
$adminModule = $dic->getAdminModule();

#PS. It is assumed that UserController manages the services of the module .. in a word - a real controller)