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Displaying dates
Dates can be displayed using the <em>Plain</em> or the <em>Default</em> formatter. The <em>Plain</em> formatter displays the date in the <a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a> format. If you choose the <em>Default</em> formatter, you can choose a format from a predefined list that can be managed on the <a href=":date_format_list">Date and time formats</a> page.
What is a theme?
The Automated Cron module runs cron operations for your site using normal browser/page requests instead of having to set up a separate cron job. The Automated Cron module checks at the end of each server response when cron operation was last ran and, if it has been too long since last run, it executes the cron tasks after sending a server response. For more information, see the <a href=":automated_cron-documentation">online documentation for the Automated Cron module</a>.
A <em>theme</em> is a set of files that define the visual look and feel of your site. The core software and modules that run on your site determine which content (including HTML text and other data stored in the database, uploaded images, and any other asset files) is displayed on the pages of your site. The theme determines the HTML markup and CSS styling that wraps the content. Several basic themes are supplied with the core software; additional <em>contributed themes</em> can be downloaded separately from the <a href="https://www.drupal.org/project/project_theme">Download &amp; Extend page on drupal.org</a>, or you can create your own theme.
Configuring Automated Cron
What is a base theme?
On the <a href=":cron-settings">Cron page</a>, you can set the frequency (time interval) for running cron jobs.
A base theme is a theme that is not meant to be used directly on a site, but instead acts as a scaffolding for building other themes. The core Stable 9 theme is one example; other base themes can be downloaded from the <a href="https://www.drupal.org/project/project_theme">Download &amp; Extend page on drupal.org</a>.
Disabling Automated Cron
What is a layout?
To disable automated cron, the recommended method is to uninstall the module, to reduce site overhead. If you only want to disable it temporarily, you can set the frequency to Never on the Cron page, and then change the frequency back when you want to start it up again.
A <em>layout</em> is a template that defines where blocks and other pieces of content should be displayed. The core Layout Discovery module allows modules and themes to register layouts, and the core Layout Builder module provides a visual interface for placing fields and blocks in layouts for entity sub-types and individual entity items (see @content_structure_topic for more on entities and fields).
Changing site appearance overview
The main way to change the overall appearance of your site is to switch the default theme. The core Layout Builder and Layout Discovery modules allow you to define layouts for your site's content, and the core Breakpoint module helps themes change appearance for different-sized devices. See the related topics listed below for specific tasks.
Extending and Customizing Your Site (Drupal User Guide)
Theming Drupal
Managing height, width, and resolution breakpoints
Uninstalling an unused theme
Installing a theme and setting default themes
The Help module generates <a href=":help-page">Help topics and reference pages</a> to guide you through the use and configuration of modules, and provides a Help block with page-level help. The reference pages are a starting point for <a href=":handbook">Drupal.org online documentation</a> pages that contain more extensive and up-to-date information, are annotated with user-contributed comments, and serve as the definitive reference point for all Drupal documentation. For more information, see the <a href=":help">online documentation for the Help module</a>.
Help topics provided by modules and themes are also part of the Help module. If the core Search module is installed, these topics are searchable. For more information, see the <a href=":online">online documentation, Help Topic Standards</a>.
Providing a help reference
The Help module displays explanations for using each module listed on the main <a href=":help">Help reference page</a>.
Providing page-specific help
Page-specific help text provided by modules is displayed in the Help block. This block can be placed and configured on the <a href=":blocks">Block layout page</a>.
Viewing help topics
The top-level help topics are listed on the main <a href=":help_page">Help page</a>. Links to other topics, including non-top-level help topics, can be found under the "Related" heading when viewing a topic page.
Providing help topics
Modules and themes can provide help topics as Twig-file-based plugins in a project sub-directory called <em>help_topics</em>; plugin meta-data is provided in YAML front matter within each Twig file. Plugin-based help topics provided by modules and themes will automatically be updated when a module or theme is updated. Use the plugins in <em>core/modules/help/help_topics</em> as a guide when writing and formatting a help topic plugin for your theme or module.