Changed the way that date format selector is shown.

Changed the way that date format selector is shown excluding ambiguity when day and month have same value.
- i.e. 01/01/2012 (mm-DD-YYYY) and 01/01/2012 (DD-mm-YYYY)
Now it displays 31/12/2012 for DD-mm-YYYY and 12/31/2012 for mm-DD-YYYY.

Change-Id: I27434c9d5713491950d4f345dccf65d647d399cf

src/com/android/settings/DateTimeSettings.java

@@ -118,6 +118,10 @@ public class DateTimeSettings extends SettingsPreferenceFragment
         if (currentFormat == null) {
             currentFormat = "";
         }
+
+        // Prevents duplicated values on date format selector.
+        mDummyDate.set(mDummyDate.get(Calendar.YEAR), mDummyDate.DECEMBER, 31, 13, 0, 0);
+
         for (int i = 0; i < formattedDates.length; i++) {
             String formatted =
                     DateFormat.getDateFormatForSetting(getActivity(), dateFormats[i])