Index: includes/api/ApiQuerySiteinfo.php
===================================================================
--- includes/api/ApiQuerySiteinfo.php	(revision 37022)
+++ includes/api/ApiQuerySiteinfo.php	(working copy)
@@ -77,7 +77,8 @@
 	}
 
 	protected function appendGeneralInfo($property) {
-		global $wgSitename, $wgVersion, $wgCapitalLinks, $wgRightsCode, $wgRightsText, $wgLanguageCode, $IP, $wgEnableWriteAPI, $wgLang;
+		global $wgSitename, $wgVersion, $wgCapitalLinks, $wgRightsCode, $wgRightsText,
+			$wgLanguageCode, $IP, $wgEnableWriteAPI, $wgLang, $wgLocaltimezone, $wgLocalTZoffset, $wgContLang;
 
 		$data = array();
 		$mainPage = Title :: newFromText(wfMsgForContent('mainpage'));
@@ -96,6 +97,8 @@
 			$data['rightscode'] = $wgRightsCode;
 		$data['rights'] = $wgRightsText;
 		$data['lang'] = $wgLanguageCode;
+		if( $wgContLang->isRTL() ) 
+			$data['rtl'] = '';
 		$data['fallback8bitEncoding'] = $wgLang->fallback8bitEncoding();
 		
 		if(wfReadOnly())
@@ -103,6 +106,17 @@
 		if($wgEnableWriteAPI)
 			$data['writeapi'] = '';
 
+		$tz = $wgLocaltimezone;
+		$offset = $wgLocalTZoffset;
+		if( is_null( $tz ) ) {
+			$tz = 'UTC';
+			$offset = 0;
+        } elseif( is_null( $offset ) ) {
+			$offset = 0;
+		}
+		$data['timezone'] = $tz;
+		$data['timeoffset'] = $offset;
+
 		$this->getResult()->addValue('query', $property, $data);
 	}