Use google client api library to fetch events for display on website

hours.php

<?php

define("HOURS_LIBRARY", "your-calendar-group-id@group.calendar.google.com");

$path = '/path/to/google-api-php-client';
require_once($path . "/vendor/autoload.php");

function hours_get_data_for($calendar_id, $service, $opt_params) {
  $events = $service->events->listEvents($calendar_id, $opt_params);
  $todays_events = array();
  foreach ($events->getItems() as $event) {
    // Get a list of events to output
    // Add them to the todays events if they fit your criteria
    if (is_valid_event($event)) {
      $todays_events[] = $event;
    }
  }
  
  $output = theme_hours_todays_events_list($todays_events);
  return $output;
}

function is_valid_event($event) {
  // use your own logic here. 
  // We have ours set as all day events on the calendar and we just check for that
  return TRUE: 
}

function theme_hours_todays_events_list($todays_events) {

  $output = '';
  $output .= '<ul>';
  if (count($todays_events)) {
    foreach ($todays_events as $event) {
      $output .= '<li>' . $event . '</li>';
    }
  } else {
    $output .= '<li>No information available</li>';
  }

  $output .= '</ul>';
  return $output;
}

try {
  $developerkey = '<your-key-here>';
  $client = new Google_Client();
  $client->setApplicationName("lts-hours");
  $client->setDeveloperKey($developerkey);
  $service = new Google_Service_Calendar($client);

  $opt_params = array(
    'timeMin' => date(DateTime::ATOM, mktime(5,5,5)),
    'timeMax' => date(DateTime::ATOM, mktime(18,59,59)),
    'singleEvents' => TRUE,
  );
  
  // Query Google and generate the output we desire
  $output = hours_get_data_for(HOURS_LIBRARY, $service, $opt_params);
  
} catch (\Exception $e) {
    // handle exceptions here
}