1   /*
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2026, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v2.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.classic.pattern;
15  
16  import ch.qos.logback.classic.spi.ILoggingEvent;
17  
18  /**
19   * The EpochConverter class extends the ClassicConverter to handle the conversion of logging event
20   * timestamps into epoch time. This class allows control over whether the output epoch time is
21   * represented in milliseconds (default) or seconds.
22   *
23   * @since 1.5.25
24   */
25  public class EpochConverter extends ClassicConverter {
26  
27      // assume output in milliseconds by default
28      boolean inUnitsOfSeconds = false;
29  
30      @Override
31      public void start() {
32          String millisOrSecondsStr = getFirstOption();
33          if ("seconds".equalsIgnoreCase(millisOrSecondsStr)) {
34              inUnitsOfSeconds = true;
35          }
36  
37          super.start();
38  
39      }
40  
41      @Override
42      public String convert(ILoggingEvent event) {
43  
44          if(inUnitsOfSeconds) {
45              return Long.toString(event.getTimeStamp() / 1000);
46          } else {
47              return Long.toString(event.getTimeStamp());
48          }
49      }
50  }