diff --git a/FSCalendar/FSCalendar.m b/FSCalendar/FSCalendar.m
index 30da90d..9b51fa2 100644
--- a/FSCalendar/FSCalendar.m
+++ b/FSCalendar/FSCalendar.m
@@ -361,7 +361,7 @@ typedef NS_ENUM(NSUInteger, FSCalendarOrientation) {
             _collectionView.frame = _daysContainer.bounds;
             
         }
-
+        _collectionView.fs_height = FSCalendarHalfFloor(_collectionView.fs_height);
         _topBorder.frame = CGRectMake(0, -1, self.fs_width, 1);
         _bottomBorder.frame = CGRectMake(0, self.fs_height, self.fs_width, 1);
         _scopeHandle.fs_bottom = _bottomBorder.fs_top;
diff --git a/FSCalendar/FSCalendarConstants.h b/FSCalendar/FSCalendarConstants.h
index ed0ea59..8df7a72 100644
--- a/FSCalendar/FSCalendarConstants.h
+++ b/FSCalendar/FSCalendarConstants.h
@@ -68,6 +68,10 @@ CG_EXTERN CGSize const CGSizeAutomatic;
 #define FSCalendarMod(c1,c2) fmodf(c1,c2)
 #endif
 
+#define FSCalendarHalfRound(c) (FSCalendarRound(c*2)*0.5)
+#define FSCalendarHalfFloor(c) (FSCalendarFloor(c*2)*0.5)
+#define FSCalendarHalfCeil(c) (FSCalendarCeil(c*2)*0.5)
+
 #define FSCalendarUseWeakSelf __weak __typeof__(self) FSCalendarWeakSelf = self;
 #define FSCalendarUseStrongSelf __strong __typeof__(self) self = FSCalendarWeakSelf;