diff --git a/src/Calendar/Navigation.jsx b/src/Calendar/Navigation.jsx
index 26369f07..0bb31f6a 100644
--- a/src/Calendar/Navigation.jsx
+++ b/src/Calendar/Navigation.jsx
@@ -70,12 +70,11 @@ export default function Navigation({
     return minDate && minDate >= previousActiveEndDate;
   })();
 
-  const nextButtonDisabled = maxDate && maxDate <= nextActiveStartDate;
-
+  const nextButtonDisabled = maxDate && maxDate < nextActiveStartDate;
   const next2ButtonDisabled = (
     shouldShowPrevNext2Buttons
     && maxDate
-    && maxDate <= nextActiveStartDate2
+    && maxDate < nextActiveStartDate2
   );
 
   function onClickPrevious() {
diff --git a/src/TileGroup.jsx b/src/TileGroup.jsx
index ee60004e..824e2077 100644
--- a/src/TileGroup.jsx
+++ b/src/TileGroup.jsx
@@ -54,8 +54,8 @@ TileGroup.propTypes = {
   ...tileGroupProps,
   activeStartDate: PropTypes.instanceOf(Date),
   count: PropTypes.number,
-  dateType: PropTypes.string,
   dateTransform: PropTypes.func.isRequired,
+  dateType: PropTypes.string,
   offset: PropTypes.number,
   step: PropTypes.number,
   tile: PropTypes.func.isRequired,