bug fixed for Timestamp serialize

src/main/java/com/alibaba/fastjson/serializer/DateCodec.java

@@ -156,7 +156,7 @@ public class DateCodec extends AbstractDateDeserializer implements ObjectSeriali
             if (nanos > 0) {
                 buf = "0000-00-00 00:00:00.000000000".toCharArray();
                 int nanoSize = IOUtils.stringSize(nanos);
-                IOUtils.getChars(nanos, 30 - (9 - nanoSize), buf);
+                IOUtils.getChars(nanos, 29 - (9 - nanoSize), buf);
                 IOUtils.getChars(second, 19, buf);
                 IOUtils.getChars(minute, 16, buf);
                 IOUtils.getChars(hour, 13, buf);

src/test/java/com/alibaba/json/bvt/issue_3000/Issue3093.java

 package com.alibaba.json.bvt.issue_3000;
 
-import com.alibaba.fastjson.JSONObject;
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.serializer.SerializerFeature;
 import junit.framework.TestCase;
 
+import java.sql.Timestamp;
+import java.util.Calendar;
+
 public class Issue3093 extends TestCase {
     public void test_for_issue() throws Exception {
-        String jsonStr = "{1:1}";
-        JSONObject jsonObject = JSONObject.parseObject(jsonStr);
-        assertTrue(jsonObject.containsKey(1));
-        assertTrue(jsonObject.containsKey("1"));
-        assertEquals(1, jsonObject.get(1));
-        assertEquals(1, jsonObject.get("1"));
+        Timestamp ts = new Timestamp(Calendar.getInstance().getTimeInMillis());
+        String json = JSON.toJSONString(ts, SerializerFeature.UseISO8601DateFormat);
+        System.out.println(json);
     }
 }