get_gmt_from_date() WordPress Function

function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) {
	$datetime = date_create( $string, wp_timezone() );

	if ( false === $datetime ) {
		return gmdate( $format, 0 );
	}

	return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( $format );
}
Used By	Description
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php:WP_REST_Posts_Controller::prepare_item_for_response()	Prepares a single post output for response.
wp-includes/rest-api.php:rest_get_date_with_gmt()	Parses a date into both its local and UTC equivalent, in MySQL datetime format.
wp-admin/includes/post.php:_wp_translate_postdata()	Renames `$_POST` data from form names to DB post columns.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::save()	Handles customize_save WP Ajax request to save/update a changeset.
wp-includes/post.php:_future_post_hook()	Hook used to schedule publication for a post marked for the future.
wp-includes/post.php:wp_insert_post()	Insert or update a post.
wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::_convert_date_gmt()	Convert a WordPress GMT date string to an IXR_Date object.
wp-includes/comment.php:wp_update_comment()	Updates an existing comment in the database.
wp-includes/comment.php:wp_insert_comment()	Inserts a comment into the database.