Add MDY to DateStyle in PgServerThread

Client may send just ISO but expect value with secord part just after that,
so append it to client setting too.

h2/src/main/org/h2/server/pg/PgServerThread.java

@@ -67,7 +67,7 @@ public class PgServerThread implements Runnable {
     private final int secret;
     private JdbcStatement activeRequest;
     private String clientEncoding = SysProperties.PG_DEFAULT_CLIENT_ENCODING;
-    private String dateStyle = "ISO";
+    private String dateStyle = "ISO, MDY";
     private final HashMap<String, Prepared> prepared =
             new CaseInsensitiveMap<>();
     private final HashMap<String, Portal> portals =
@@ -183,6 +183,9 @@ public class PgServerThread implements Runnable {
                         // UTF8
                         clientEncoding = value;
                     } else if ("DateStyle".equals(param)) {
+                        if (value.indexOf(',') < 0) {
+                            value += ", MDY";
+                        }
                         dateStyle = value;
                     }
                     // extra_float_digits 2