Date Utils : Date « Data Type « Java

1. Java
2. Data Type
3. Date

Date Utils

  
/*
** Caramel - Non-GUI Java Addons
** Copyright (c) 2001, 2002, 2003 by Gerald Bauer
**
** This program is free software.
**
** You may redistribute it and/or modify it under the terms of the GNU
** Lesser General Public License as published by the Free Software Foundation.
** Version 2.1 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.
**
*/


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;

   public static String getDate()
   {
      Calendar cal = Calendar.getInstance();
      cal.setTime( new Date() );

      int year = cal.get( Calendar.YEAR );
      int month = cal.get( Calendar.MONTH ) + 1;
      int day = cal.get( Calendar.DAY_OF_MONTH );

      return "" + year
             + "-" + month
             + "-" + day;
   }

   /**
    *  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 );
   }

   public static String getTime()
   {
      Calendar cal = Calendar.getInstance();
      cal.setTime( new Date() );

      int hours = cal.get( Calendar.HOUR_OF_DAY );
      // use 24 hour clock
      int minutes = cal.get( Calendar.MINUTE );
      int seconds = cal.get( Calendar.SECOND );
      int milli = cal.get( Calendar.MILLISECOND );

      return formatTime( hours, minutes, seconds, milli );
   }

   public static String getTimestamp()
   {
      Calendar cal = Calendar.getInstance();
      cal.setTime( new Date() );

      int year = cal.get( Calendar.YEAR );
      int month = cal.get( Calendar.MONTH ) + 1;
      int day = cal.get( Calendar.DAY_OF_MONTH );
      int hours = cal.get( Calendar.HOUR_OF_DAY );
      // use 24 hour clock
      int minutes = cal.get( Calendar.MINUTE );
      int seconds = cal.get( Calendar.SECOND );
      int milli = cal.get( Calendar.MILLISECOND );

      return "" + year
             + "-" + month
             + "-" + day
             + "_" + formatTime( hours, minutes, seconds, milli );
   }

   private static String formatTime( int hours, int minutes, int seconds, int milli )
   {
      StringBuffer buf = new StringBuffer();
      buf.append( "" + hours );

      buf.append( "." );

      if( minutes < 10 )
         buf.append( "0" + minutes );
      else
         buf.append( "" + minutes );

      buf.append( "." );

      if( seconds < 10 )
         buf.append( "0" + seconds );
      else
         buf.append( "" + seconds );

      buf.append( "-" );

      if( milli < 10 )
         buf.append( "00" + milli );
      else if( milli < 100 )
         buf.append( "0" + milli );
      else
         buf.append( "" + milli );

      return buf.toString();
   }

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

}

   
    
  

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