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diff --git a/unused/srcjar_unused/org/apache/log4j/pattern/RelativeTimePatternConverter.java b/unused/srcjar_unused/org/apache/log4j/pattern/RelativeTimePatternConverter.java
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+/*
+ * 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.log4j.pattern;
+
+import org.apache.log4j.spi.LoggingEvent;
+
+
+/**
+ * Return the relative time in milliseconds since loading of the LoggingEvent
+ * class.
+ *
+ * @author Ceki Gülcü
+ */
+public class RelativeTimePatternConverter extends LoggingEventPatternConverter {
+  /**
+   * Cached formatted timestamp.
+   */
+  private CachedTimestamp lastTimestamp = new CachedTimestamp(0, "");
+
+  /**
+   * Private constructor.
+   */
+  public RelativeTimePatternConverter() {
+    super("Time", "time");
+  }
+
+  /**
+   * Obtains an instance of RelativeTimePatternConverter.
+   * @param options options, currently ignored, may be null.
+   * @return instance of RelativeTimePatternConverter.
+   */
+  public static RelativeTimePatternConverter newInstance(
+    final String[] options) {
+    return new RelativeTimePatternConverter();
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public void format(final LoggingEvent event, final StringBuffer toAppendTo) {
+    long timestamp = event.timeStamp;
+
+    if (!lastTimestamp.format(timestamp, toAppendTo)) {
+      final String formatted =
+        Long.toString(timestamp - LoggingEvent.getStartTime());
+      toAppendTo.append(formatted);
+      lastTimestamp = new CachedTimestamp(timestamp, formatted);
+    }
+  }
+
+  /**
+   * Cached timestamp and formatted value.
+   */
+  private static final class CachedTimestamp {
+    /**
+     * Cached timestamp.
+     */
+    private final long timestamp;
+
+    /**
+     * Cached formatted timestamp.
+     */
+    private final String formatted;
+
+    /**
+     * Creates a new instance.
+     * @param timestamp timestamp.
+     * @param formatted formatted timestamp.
+     */
+    public CachedTimestamp(long timestamp, final String formatted) {
+      this.timestamp = timestamp;
+      this.formatted = formatted;
+    }
+
+    /**
+     * Appends the cached formatted timestamp to the buffer if timestamps match.
+     * @param newTimestamp requested timestamp.
+     * @param toAppendTo buffer to append formatted timestamp.
+     * @return true if requested timestamp matched cached timestamp.
+     */
+    public boolean format(long newTimestamp, final StringBuffer toAppendTo) {
+      if (newTimestamp == timestamp) {
+        toAppendTo.append(formatted);
+
+        return true;
+      }
+
+      return false;
+    }
+  }
+}