REST API: Add `gmt_offset` and `timezone_string` to the base `/wp-json` response.

The site's current timezone offset is an important piece of information for any REST API client that needs to manipulate dates.  It has not been 
previously available.

Expose both the `gmt_offset` (the site's current offset from UTC in hours) and `timezone_string` (which also provides information about daylight 
savings time) via the "site info" endpoint (the base `/wp-json` response).

Also update the `wp-api-generated.js` fixture file with the changes to the default API responses.

Props sagarkbhatt.
Fixes #39854.

Merges [40238] to the 4.7 branch.

Built from https://develop.svn.wordpress.org/branches/4.7@40336


git-svn-id: http://core.svn.wordpress.org/branches/4.7@40243 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/class-wp-rest-server.php

@@ -1010,13 +1010,15 @@ class WP_REST_Server {
 	public function get_index( $request ) {
 		// General site data.
 		$available = array(
-			'name'           => get_option( 'blogname' ),
-			'description'    => get_option( 'blogdescription' ),
-			'url'            => get_option( 'siteurl' ),
-			'home'           => home_url(),
-			'namespaces'     => array_keys( $this->namespaces ),
-			'authentication' => array(),
-			'routes'         => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
+			'name'            => get_option( 'blogname' ),
+			'description'     => get_option( 'blogdescription' ),
+			'url'             => get_option( 'siteurl' ),
+			'home'            => home_url(),
+			'gmt_offset'      => get_option( 'gmt_offset' ),
+			'timezone_string' => get_option( 'timezone_string' ),
+			'namespaces'      => array_keys( $this->namespaces ),
+			'authentication'  => array(),
+			'routes'          => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
 		);
 
 		$response = new WP_REST_Response( $available );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7.4-alpha-40335';
+$wp_version = '4.7.4-alpha-40336';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.