diff --git a/PDTSimpleCalendar/PDTSimpleCalendarViewController.h b/PDTSimpleCalendar/PDTSimpleCalendarViewController.h
index 661e056..ee5943c 100644
--- a/PDTSimpleCalendar/PDTSimpleCalendarViewController.h
+++ b/PDTSimpleCalendar/PDTSimpleCalendarViewController.h
@@ -154,4 +154,23 @@
  */
 - (UIColor *)simpleCalendarViewController:(PDTSimpleCalendarViewController *)controller textColorForDate:(NSDate *)date;
 
+/** @name Date cell Customization */
+
+/**
+ *  Asks the delegate custom date cell
+ *
+ *  @return Customized date cell should be inherited from `PSTSimpleCalenderViewCell`
+ */
+- (Class)customCollectionViewCellClass;
+
+/**
+ *  Give delegate a chance to manipulate custom date cell
+ *
+ *  @param cell the calendarView cell
+ *  @param date the date of cell
+ *
+ *  @return YES if the calendar must ask the delegate for text and circle color, NO if it should use default values.
+ */
+- (void)customCellManipulate:(UICollectionViewCell * __nonnull)cell withDate:( NSDate * _Nullable )date;
+
 @end;
diff --git a/PDTSimpleCalendar/PDTSimpleCalendarViewController.m b/PDTSimpleCalendar/PDTSimpleCalendarViewController.m
index 658e711..b7e8d2e 100644
--- a/PDTSimpleCalendar/PDTSimpleCalendarViewController.m
+++ b/PDTSimpleCalendar/PDTSimpleCalendarViewController.m
@@ -206,9 +206,11 @@ - (void)setSelectedDate:(NSDate *)newSelectedDate
         return;
     }
 
-
-    [[self cellForItemAtDate:_selectedDate] setSelected:NO];
-    [[self cellForItemAtDate:startOfDay] setSelected:YES];
+    // Don't clear other cell circle if collectionView in multipleSelection mode 
+    if (!self.collectionView.allowsMultipleSelection) {
+        [[self cellForItemAtDate:_selectedDate] setSelected:NO];
+        [[self cellForItemAtDate:startOfDay] setSelected:YES];
+    }
 
     _selectedDate = startOfDay;
 
@@ -271,7 +273,15 @@ - (void)viewDidLoad
     // Do any additional setup after loading the view.
 
     //Configure the Collection View
-    [self.collectionView registerClass:[PDTSimpleCalendarViewCell class] forCellWithReuseIdentifier:PDTSimpleCalendarViewCellIdentifier];
+    Class collectionViewCellClass;
+    // if delegate offer a custom cell
+    if ([self.delegate respondsToSelector:@selector(customCollectionViewCellClass)]) {
+        collectionViewCellClass = [self.delegate customCollectionViewCellClass]; // use it
+    }
+    else {
+        collectionViewCellClass = [PDTSimpleCalendarViewCell class];  // otherwise use default cell
+    }
+    [self.collectionView registerClass:collectionViewCellClass forCellWithReuseIdentifier:PDTSimpleCalendarViewCellIdentifier];
     [self.collectionView registerClass:[PDTSimpleCalendarViewHeader class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:PDTSimpleCalendarViewHeaderIdentifier];
 
     self.collectionView.delegate = self;
@@ -399,6 +409,12 @@ - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cell
     if (![self isEnabledDate:cellDate] || isCustomDate) {
         [cell refreshCellColors];
     }
+    
+    // let delegate manipulate cell
+    if ([self.delegate respondsToSelector:@selector(customCellManipulate:withDate:)]) {
+        BOOL hasDate = cellDateComponents.month == firstOfMonthsComponents.month;
+        [self.delegate customCellManipulate:cell withDate:hasDate ? cellDate : nil];
+    }
 
     //We rasterize the cell for performances purposes.
     //The circle background is made using roundedCorner which is a super expensive operation, specially with a lot of items on the screen to display (like we do)