Expanded class hierarchy of DateHelper in Drupal 8
- class \Drupal\Core\Datetime\DateHelper
- class \Drupal\calendar\CalendarHelper
- class \Drupal\calendar\CalendarHelper
- class \Drupal\office_hours\OfficeHoursDateHelper
- class \Drupal\persian_date\PersianDateHelper
- class \Drupal\persian_date\PersianDateHelper