time_range.module

<?php

/**
 * @file
 * Module implementation file.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function time_range_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.time_range':
      $output = '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('This module not stored time data. The storage of time is provided by the core.  
') . '</p>';
      $output .= '<dl>';
      $output .= '<dt>' . t('General') . '</dt>';
      $output .= '<dd>' . t('Create a Date Range field, select Day and time as field type.') . '</dd>';
      $output .= '<dd>' . t("To select Time range, go to your content type\'s form display settings 
and select Time Range.") . '</dd>';
      $output .= '<dd>' . t("If you don\'t want to see the date on content\'s display, go to your content type\'s display settings and change the 
Date/time format in your style.") . '</dd>';
      $output .= '<dd>' . t('If you have suggestions or questions . You can write down issue in  <a href="https://github.com/DravenK/time-range/issues"> time_range</a>\'s page on github  , or <a href="https://www.drupal.org/project/time_range">time_range</a>\'s project page on drupal.org .') . '</dd>';
      $output .= '</dl>';

      return $output;
  }
  return NULL;
}

/**
 * Implements hook_field_widget_info_alter().
 */
function time_range_field_widget_info() {
  return [
    'time_range' => [
      'label' => t('Time Range'),
      'field types' => ['datetime_range'],
      'settings' => [
        'add_new_text' => 'Add new customer...',
      ],
    ],
  ];
}