Add Date equivalent of isSameDay method

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137972 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/time/DateUtils.java

@@ -31,7 +31,7 @@ import java.util.TimeZone;
  * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
  * @author Phil Steitz
  * @since 2.0
- * @version $Id: DateUtils.java,v 1.31 2004/10/08 00:09:01 scolebourne Exp $
+ * @version $Id: DateUtils.java,v 1.32 2004/10/13 21:48:00 scolebourne Exp $
  */
 public class DateUtils {
     
@@ -117,6 +117,31 @@ public class DateUtils {
     public DateUtils() {
     }
 
+    //-----------------------------------------------------------------------
+    /**
+     * <p>Checks if two date objects are on the same day ignoring time.</p>
+     *
+     * <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true.
+     * 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false.
+     * </p>
+     * 
+     * @param date1  the first date, not null
+     * @param date2  the second date, not null
+     * @return true if they represent the same day
+     * @throws IllegalArgumentException if either date is <code>null</code>
+     * @since 2.1
+     */
+    public static boolean isSameDay(Date date1, Date date2) {
+        if (date1 == null || date2 == null) {
+            throw new IllegalArgumentException("The date must not be null");
+        }
+        Calendar cal1 = Calendar.getInstance();
+        cal1.setTime(date1);
+        Calendar cal2 = Calendar.getInstance();
+        cal2.setTime(date2);
+        return isSameDay(cal1, cal2);
+    }
+
     //-----------------------------------------------------------------------
     /**
      * <p>Checks if two calendar objects are on the same day ignoring time.</p>

src/test/org/apache/commons/lang/time/DateUtilsTest.java

@@ -153,7 +153,20 @@ public class DateUtilsTest extends TestCase {
     }
     
     //-----------------------------------------------------------------------
-    public void testIsSameDay() {
+    public void testIsSameDay_Date() {
+        Date date1 = new GregorianCalendar(2004, 6, 9, 13, 45).getTime();
+        Date date2 = new GregorianCalendar(2004, 6, 9, 13, 45).getTime();
+        assertEquals(true, DateUtils.isSameDay(date1, date2));
+        date2 = new GregorianCalendar(2004, 6, 10, 13, 45).getTime();
+        assertEquals(false, DateUtils.isSameDay(date1, date2));
+        date1 = new GregorianCalendar(2004, 6, 10, 13, 45).getTime();
+        assertEquals(true, DateUtils.isSameDay(date1, date2));
+        date2 = new GregorianCalendar(2005, 6, 10, 13, 45).getTime();
+        assertEquals(false, DateUtils.isSameDay(date1, date2));
+    }
+    
+    //-----------------------------------------------------------------------
+    public void testIsSameDay_Cal() {
         GregorianCalendar cal1 = new GregorianCalendar(2004, 6, 9, 13, 45);
         GregorianCalendar cal2 = new GregorianCalendar(2004, 6, 9, 13, 45);
         assertEquals(true, DateUtils.isSameDay(cal1, cal2));