diff -r 4633027730f5 -r e6ad4ef83b23 src/hbwidgets/widgets/hbdatetimepicker_p.cpp
--- a/src/hbwidgets/widgets/hbdatetimepicker_p.cpp	Wed Aug 18 10:05:37 2010 +0300
+++ b/src/hbwidgets/widgets/hbdatetimepicker_p.cpp	Thu Sep 02 20:44:51 2010 +0300
@@ -127,6 +127,9 @@
                     appendSeparator(&newSeparators, format, index, i - index, lastQuote);
                     i += sn.count - 1;
                     index = i + 1;
+                    if(newDisplay & hour) {
+                        return false; // error in format
+                    }
                     newDisplay |= hour;
                 }
                 break;
@@ -137,6 +140,9 @@
                     appendSeparator(&newSeparators, format, index, i - index, lastQuote);
                     i += sn.count - 1;
                     index = i + 1;
+                    if(newDisplay & MinuteSection) {
+                        return false; // error in format
+                    }
                     newDisplay |= MinuteSection;
                 }
                 break;
@@ -147,6 +153,9 @@
                     appendSeparator(&newSeparators, format, index, i - index, lastQuote);
                     i += sn.count - 1;
                     index = i + 1;
+                    if(newDisplay & SecondSection) {
+                        return false; // error in format
+                    }
                     newDisplay |= SecondSection;
                 }
                 break;
@@ -158,6 +167,9 @@
                     appendSeparator(&newSeparators, format, index, i - index, lastQuote);
                     i += sn.count - 1;
                     index = i + 1;
+                    if(newDisplay & MSecSection) {
+                        return false; // error in format
+                    }
                     newDisplay |= MSecSection;
                 }
                 break;
@@ -168,6 +180,9 @@
                     const SectionNode sn = { AmPmSection, i - add, (cap ? 1 : 0) };
                     newSectionNodes.append(sn);
                     appendSeparator(&newSeparators, format, index, i - index, lastQuote);
+                    if(newDisplay & AmPmSection) {
+                        return false; // error in format
+                    }
                     newDisplay |= AmPmSection;
                     if (i + 1 < format.size()
                         && format.at(i+1) == (cap ? QLatin1Char('P') : QLatin1Char('p'))) {
@@ -186,6 +201,9 @@
                         appendSeparator(&newSeparators, format, index, i - index, lastQuote);
                         i += sn.count - 1;
                         index = i + 1;
+                        if(newDisplay & sn.type) {
+                            return false; //error in format
+                        }
                         newDisplay |= sn.type;
                     }
                 }
@@ -197,6 +215,9 @@
                     newSeparators.append(unquote(format.mid(index, i - index)));
                     i += sn.count - 1;
                     index = i + 1;
+                    if(newDisplay & MonthSection) {
+                        return false; // error in format
+                    }
                     newDisplay |= MonthSection;
                 }
                 break;
@@ -208,6 +229,9 @@
                     appendSeparator(&newSeparators, format, index, i - index, lastQuote);
                     i += sn.count - 1;
                     index = i + 1;
+                    if(newDisplay & (DayOfWeekSection | DaySection)) {
+                        return false; // error in format, dd and ddd not yet supported in same format
+                    }
                     newDisplay |= sn.type;
                 }
                 break;
@@ -350,10 +374,13 @@
     mIntervals[QDateTimeEdit::MinuteSection]=1;
 
     //read the format from locale
-    mFormat = localeDateTimeFormat(dateTimeMode);
+    QString newFormat = localeDateTimeFormat(dateTimeMode);
 
     //parse the format and set the sections in order
-    parseDisplayFormat(mFormat);
+    if(isFormatValid(newFormat)) {
+        mFormat=newFormat;
+        processDisplaySections();
+    }
 
     //create primitives
     createPrimitives();
@@ -382,16 +409,16 @@
     if(newDisplayFormat == mFormat) {
         return false;
     }
-    return true;
+
+    return mParser.parseFormat(newDisplayFormat);
 }
 
 /* 
    this will reset the display sections and re add them in order
    mentioned in the display format passed. this also sets the mIs24HourFormat var.
 */
-void HbDateTimePickerPrivate::parseDisplayFormat(const QString &format)
+void HbDateTimePickerPrivate::processDisplaySections()
 {
-    if(mParser.parseFormat(format)) {
         for(int i=0;i<mParser.mSectionNodes.count();++i) {
             switch(mParser.mSectionNodes[i].type) {
                 case HbDateTimeParser::DaySection:
@@ -436,7 +463,6 @@
                     /*case HbDateTimeParser::DayOfWeekSection: not supported */
             }
         }
-    }
 }
 
 /*
@@ -449,7 +475,7 @@
     Q_Q(HbDateTimePicker);
 
     if(!(mParser.mDisplaySections & (HbDateTimeParser::YearSection|
-				     HbDateTimeParser::YearSection2Digits))) {
+                     HbDateTimeParser::YearSection2Digits))) {
       deleteAndNull(mYearPicker);
       mYearModel = 0;
     }
@@ -462,7 +488,7 @@
       mDayModel = 0;
     }
     if(!(mParser.mDisplaySections & (HbDateTimeParser::Hour12Section|
-				     HbDateTimeParser::Hour24Section))) {
+                     HbDateTimeParser::Hour24Section))) {
       deleteAndNull(mHourPicker);
       mHourModel = 0;
     }
@@ -1065,10 +1091,10 @@
     }
 
     resizeModel(mMinuteModel, 
-		mMinuteOffset,mMinuteModel->index(mMinuteModel->rowCount() - 1).data().toInt(),
-		start,end,
-		&HbDateTimePickerPrivate::localeMinute, 
-		mIntervals[QDateTimeEdit::MinuteSection]);
+        mMinuteOffset,mMinuteModel->index(mMinuteModel->rowCount() - 1).data().toInt(),
+        start,end,
+        &HbDateTimePickerPrivate::localeMinute, 
+        mIntervals[QDateTimeEdit::MinuteSection]);
     mMinuteOffset = start;
 
     //Select the nearest value when the range is set.
@@ -1226,7 +1252,7 @@
                      << newStart << " newEnd=" << newEnd
                      << " interval=" << interval;
 #endif
-	    bool b1=false,b2=false;
+        bool b1=false,b2=false;
             int oldinterval=model->rowCount()>1 ? (model->index(1,0).data().toInt(&b1)-model->index(0,0).data().toInt(&b2)):0; 
 #ifdef HBDATETIMEPICKER_DEBUG
             qDebug() << "resizeModel:sameoldInterval=" << oldinterval;
@@ -1260,10 +1286,10 @@
                 }
                 return;//optimizing inserts when interval is set
             } else {
-	        if(b1 && b2) {		
-		    model->removeRows(0,model->rowCount());
+            if(b1 && b2) {      
+            model->removeRows(0,model->rowCount());
                     oldStart = oldEnd = 0;
-	        }
+            }
             }
 
         if((model->rowCount() == 0) && (newEnd-newStart>=0)) {
@@ -1627,7 +1653,7 @@
     qDebug() << "_q_minutesChanged:" << index;
     qDebug() << mLocale.toInt(mMinuteModel->index(mMinuteOffset+index,0).data().toString(),bOk, 10);
 #endif
-	QTime newTime(mDateTime.time().hour(),mLocale.toInt(mMinuteModel->index(index,0).data().toString(),bOk, 10),mDateTime.time().second());
+    QTime newTime(mDateTime.time().hour(),mLocale.toInt(mMinuteModel->index(index,0).data().toString(),bOk, 10),mDateTime.time().second());
     if(newTime.isValid()) {
         mDateTime.setTime(newTime);
     }