govcms-2.x-dev/modules/deprecated/govcms8_foundations/modules/govcms8_calendar_item/govcms8_calendar_item.module

<?php

/**
 * @file
 * Module stores customisations for the GovCMS8 calendar item work.
 */

use Drupal\Core\Datetime\DrupalDateTime;

/**
 * Implements hook_theme().
 */
function govcms8_calendar_item_theme($existing, $type, $theme, $path) {
  return [
    'calendar_item_date' => [
      'variables' => [
        'datetime' => [],
      ],
      'template' => 'calendar_item_date',
    ],
  ];
}

/**
 * Implements hook_preprocess_HOOK().
 */
function govcms8_calendar_item_preprocess_calendar_item_date(&$variables) {
  $item = $variables['datetime'];
  if (!empty($item) && $item instanceof DrupalDateTime) {
    $variables['datetime'] = $item->format('Y-m-d');
    $variables['day_textual'] = $item->format('D');
    $variables['day_number'] = $item->format('d');
    $variables['month'] = $item->format('M');
  }
}