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These are Java extensions for use with the DocBook XML stylesheets and the Xalan-Java XSLT engine.

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package com.nwalsh.xalan;

import java.io.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.text.DateFormat;
import java.text.ParseException;

/**
 * Xalan extension to convert CVS date strings into local time
 *
 * $Id: CVS.java 5932 2006-05-04 13:23:51Z nwalsh $
 *
 * Copyright (C) 2000 Norman Walsh.
 *
 * This class provides a
 * Xalan
 * extension to turn the CVS date strings, which are UTC:
 *
 * $Date: 2000/11/09 02:34:20 $
 *
 * into legibly formatted local time:
 *
 * Wed Nov 08 18:34:20 PST 2000
 *
 * (I happened to be in California when I wrote this documentation.)

 * Change Log:
 * 
 * 1.0
 * Initial release.
 * 
 *
 * @author Norman Walsh
 * [email protected]
 *
 * @version $Id: CVS.java 5932 2006-05-04 13:23:51Z nwalsh $
 *
 */
public class CVS {
  /**
   * Constructor for CVS
   *
   * All of the methods are static, so the constructor does nothing.
   */
  public CVS() {
  }

  /**
   * Convert a CVS date string into local time.
   *
   * @param cvsDate The CVS date string.
   *
   * @return The date, converted to local time and reformatted.
   */
  public String localTime (String cvsDate) {
    // A cvsDate has the following form "$Date: 2006-05-04 22:23:51 +0900 (Thu, 04 May 2006) $"
    if (!cvsDate.startsWith("$Date: ")) {
      return cvsDate;
    }

    String yrS = cvsDate.substring(7,11);
    String moS = cvsDate.substring(12,14);
    String daS = cvsDate.substring(15,17);
    String hrS = cvsDate.substring(18,20);
    String miS = cvsDate.substring(21,23);
    String seS = cvsDate.substring(24,26);

    TimeZone tz = TimeZone.getTimeZone("GMT+0");
    GregorianCalendar gmtCal = new GregorianCalendar(tz);

    try {
      gmtCal.set(Integer.parseInt(yrS),
		 Integer.parseInt(moS)-1,
		 Integer.parseInt(daS),
		 Integer.parseInt(hrS),
		 Integer.parseInt(miS),
		 Integer.parseInt(seS));
    } catch (NumberFormatException e) {
      // nop
    }

    Date d = gmtCal.getTime();

    return d.toString();
  }
}