Java Tutorial/Apache Common/DateUtils

DateUtil.Round

   <source lang="java">

/*

* ========================================================================
* 
* Copyright 2005 Tim O"Brien.
*
* Licensed 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.
* 
* ========================================================================
*/

import java.util.Calendar; import org.apache.rumons.lang.time.DateUtils; public class MainClass {

   public static void main(String[] pArgs) throws Exception {
     Calendar cal = Calendar.getInstance();
     cal.set( 2004, 2, 5, 10, 2, 2 );
     
     System.out.println( DateUtils.round( cal.getTime() , DateUtils.SEMI_MONTH ) );
     
     
   }

}</source>

Mon Mar 01 00:00:00 PST 2004

DateUtils.iterator

   <source lang="java">

import java.util.Calendar; import java.util.Date; import java.util.Iterator; import org.apache.rumons.lang.time.DateUtils; import org.apache.rumons.lang.time.StopWatch; public class MainClass {

   public static void main(String[] args) {
     StopWatch stWatch = new StopWatch();
     //Start StopWatch
     stWatch.start();
     //Get iterator for all days in a week starting Monday
     Iterator itr = DateUtils.iterator(new Date(),
             DateUtils.RANGE_WEEK_MONDAY);
     while (itr.hasNext()) {
         Calendar gCal = (Calendar) itr.next();
         System.out.println(gCal.getTime());
     }
     //Stop StopWatch
     stWatch.stop();
     System.out.println("Time Taken >>" + stWatch.getTime());
   }

}</source>

Mon May 07 00:00:00 PDT 2007
Tue May 08 00:00:00 PDT 2007
Wed May 09 00:00:00 PDT 2007
Thu May 10 00:00:00 PDT 2007
Fri May 11 00:00:00 PDT 2007
Sat May 12 00:00:00 PDT 2007
Sun May 13 00:00:00 PDT 2007
Time Taken >>32

DateUtils.Truncate

   <source lang="java">

/*

* ========================================================================
* 
* Copyright 2005 Tim O"Brien.
*
* Licensed 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.
* 
* ========================================================================
*/

import java.util.Calendar; import java.util.Date; import org.apache.rumons.lang.time.DateFormatUtils; import org.apache.rumons.lang.time.DateUtils; public class MainClass {

 public static void main(String[] pArgs) throws Exception {
   Date now = new Date();
   Date truncYear = DateUtils.truncate(now, Calendar.YEAR);
   Date truncMonth = DateUtils.truncate(now, Calendar.MONTH);
   System.out.println("now: " + DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(now));
   System.out.println("truncYear: " + DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(truncYear));
   System.out.println("truncMonth: " + DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(truncMonth));
 }

}</source>

now: 2007-05-08T15:59:12-07:00
truncYear: 2007-01-01T00:00:00-08:00
truncMonth: 2007-05-01T00:00:00-07:00