Github user martin-g commented on a diff in the pull request:
https://github.com/apache/wicket/pull/235#discussion_r142068371
--- Diff:
wicket-extensions/src/main/java/org/apache/wicket/extensions/markup/html/form/datetime/IDateConverter.java
---
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.wicket.extensions.markup.html.form.datetime;
+
+import java.time.format.DateTimeFormatter;
+import java.util.Locale;
+
+import org.apache.wicket.util.convert.IConverter;
+
+
+/**
+ * Base class for Joda Time based date converters. It contains the logic
to parse and format,
+ * optionally taking the time zone difference between clients and the
server into account.
+ * <p>
+ * Converters of this class are best suited for per-component use.
+ * </p>
+ *
+ * @author eelcohillenius
+ */
+public interface IDateConverter<T> extends IConverter<T>
--- End diff --
Can `T` be constraint-ed to something date related, for example
java.time.temporal.Temporal ?
---
