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Tomcat example source code file (DateTool.java)

This example Tomcat source code file (DateTool.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

date, date, dateformat, dateformat, datetool, eee, gmt, hh:mm:ss, locale_us, locale_us, mmm, simpledateformat, string, string, text, util

The Tomcat DateTool.java source code

 *  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.tomcat.util.buf;

import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

import org.apache.tomcat.util.res.StringManager;

 *  Common place for date utils.
 * @deprecated Will be replaced with a more efficient impl, based on
 * FastDateFormat, with an API using less objects.
 * @author dac@eng.sun.com
 * @author Jason Hunter [jch@eng.sun.com]
 * @author James Todd [gonzo@eng.sun.com]
 * @author Costin Manolache
public class DateTool {

    /** US locale - all HTTP dates are in english
    private final static Locale LOCALE_US = Locale.US;

    /** GMT timezone - all HTTP dates are on GMT
    public final static TimeZone GMT_ZONE = TimeZone.getTimeZone("GMT");

    /** format for RFC 1123 date string -- "Sun, 06 Nov 1994 08:49:37 GMT"
    public final static String RFC1123_PATTERN =
        "EEE, dd MMM yyyy HH:mm:ss z";

    // format for RFC 1036 date string -- "Sunday, 06-Nov-94 08:49:37 GMT"
    public final static String rfc1036Pattern =
        "EEEEEEEEE, dd-MMM-yy HH:mm:ss z";

    // format for C asctime() date string -- "Sun Nov  6 08:49:37 1994"
    public final static String asctimePattern =
        "EEE MMM d HH:mm:ss yyyy";

    /** Pattern used for old cookies
    private final static String OLD_COOKIE_PATTERN = "EEE, dd-MMM-yyyy HH:mm:ss z";

    /** DateFormat to be used to format dates. Called from MessageBytes
    private final static DateFormat rfc1123Format =
	new SimpleDateFormat(RFC1123_PATTERN, LOCALE_US);
    /** DateFormat to be used to format old netscape cookies
	Called from ServerCookie
    private final static DateFormat oldCookieFormat =
    private final static DateFormat rfc1036Format =
	new SimpleDateFormat(rfc1036Pattern, LOCALE_US);
    private final static DateFormat asctimeFormat =
	new SimpleDateFormat(asctimePattern, LOCALE_US);
    static {
    private static String rfc1123DS;
    private static long   rfc1123Sec;

    private static StringManager sm =

    // Called from MessageBytes.getTime()
    static long parseDate( MessageBytes value ) {
     	return parseDate( value.toString());

    // Called from MessageBytes.setTime
    public static String format1123( Date d ) {
	String dstr=null;
	synchronized(rfc1123Format) {
	    dstr = format1123(d, rfc1123Format);
	return dstr;

    public static String format1123( Date d,DateFormat df ) {
        long dt = d.getTime() / 1000;
        if ((rfc1123DS != null) && (dt == rfc1123Sec))
            return rfc1123DS;
        rfc1123DS  = df.format( d );
        rfc1123Sec = dt;
        return rfc1123DS;

    // Called from ServerCookie
    public static void formatOldCookie( Date d, StringBuffer sb,
					  FieldPosition fp )
	synchronized(oldCookieFormat) {
	    oldCookieFormat.format( d, sb, fp );

    // Called from ServerCookie
    public static String formatOldCookie( Date d )
	String ocf=null;
	synchronized(oldCookieFormat) {
	    ocf= oldCookieFormat.format( d );
	return ocf;

    /** Called from HttpServletRequest.getDateHeader().
	Not efficient - but not very used.
    public static long parseDate( String dateString ) {
	DateFormat [] format = {rfc1123Format,rfc1036Format,asctimeFormat};
	return parseDate(dateString,format);
    public static long parseDate( String dateString, DateFormat []format ) {
	Date date=null;
	for(int i=0; i < format.length; i++) {
	    try {
		date = format[i].parse(dateString);
		return date.getTime();
	    } catch (ParseException e) { }
	    catch (StringIndexOutOfBoundsException e) { }
	String msg = sm.getString("httpDate.pe", dateString);
	throw new IllegalArgumentException(msg);


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