Fix date format issues on MS SQL Server (#1488918)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix date format issues on MS SQL Server (#1488918)
 - Fix so non-inline images aren't skipped on forward (#1489150)
 - Add imap_cache_ttl option to configure TTL of imap_cache
 - Make LDAP cache engine configurable via ldap_cache and ldap_cache_ttl options

program/lib/Roundcube/rcube_db.php

@@ -368,8 +368,10 @@ class rcube_db
      */
     protected function _query($query, $offset, $numrows, $params)
     {
+        $query = trim($query);
+
         // Read or write ?
-        $mode = preg_match('/^(select|show)/i', ltrim($query)) ? 'r' : 'w';
+        $mode = preg_match('/^(select|show|set)/i', $query) ? 'r' : 'w';
 
         $this->db_connect($mode);
 

program/lib/Roundcube/rcube_db_mssql.php

@@ -45,6 +45,18 @@ class rcube_db_mssql extends rcube_db
         // UTF-8 is default
     }
 
+    /**
+     * Driver-specific configuration of database connection
+     *
+     * @param array $dsn DSN for DB connections
+     * @param PDO   $dbh Connection handler
+     */
+    protected function conn_configure($dsn, $dbh)
+    {
+        // Set date format in case of non-default language (#1488918)
+        $this->query("SET DATEFORMAT ymd");
+    }
+
     /**
      * Return SQL function for current time and date
      *

program/lib/Roundcube/rcube_db_sqlsrv.php

@@ -45,6 +45,18 @@ class rcube_db_sqlsrv extends rcube_db
         // UTF-8 is default
     }
 
+    /**
+     * Driver-specific configuration of database connection
+     *
+     * @param array $dsn DSN for DB connections
+     * @param PDO   $dbh Connection handler
+     */
+    protected function conn_configure($dsn, $dbh)
+    {
+        // Set date format in case of non-default language (#1488918)
+        $this->query("SET DATEFORMAT ymd");
+    }
+
     /**
      * Return SQL function for current time and date
      *