/*
** Rachel  - Resource Loading Toolkit for Web Start/JNLP
** Copyright (c) 2001, 2002 by Gerald Bauer
**
** This program is free software.
**
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE.
**
*/

package rachel.util;

import java.text.*;
import java.util.*;

public class DateUtils
{
   /**
    *  RFC 1123 date format example: Mon, 06 May 1996 04:57:00 GMT - days: Mon,
    *  Tue, Wed, Thu, Fri, Sat, Sun - months: Jan, Feb, Mar, Apr, May, Jun, Jul,
    *  Aug, Sep, Oct, Nov, Dec
    */
   private static SimpleDateFormat _df;

   /**
    *  convienence method returns current timestamp
    */
   public static String getHttpDate()
   {
      return getHttpDate( new Date() );
   }

   public static String getHttpDate( long timestamp )
   {
      return getHttpDate( new Date( timestamp ) );
   }

   public static String getHttpDate( Date date )
   {
      return _df.format( date );
   }

   static
   {
      _df = new SimpleDateFormat( "EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US );
      _df.setTimeZone( TimeZone.getTimeZone( "GMT" ) );
   }
}