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diff --git a/src/org/traccar/database/JsonConvertable.java b/src/org/traccar/database/JsonConvertable.java
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+++ b/src/org/traccar/database/JsonConvertable.java
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+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed 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.traccar.database;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import javax.json.JsonObject;
+
+public interface JsonConvertable {
+    
+    public static final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ");
+    
+    public JsonObject toJson();
+    
+    public void fromJson(JsonObject json) throws Exception;
+    
+}