diff --git a/.changeset/flat-pants-accept.md b/.changeset/flat-pants-accept.md
new file mode 100644
index 0000000000..8c71441e13
--- /dev/null
+++ b/.changeset/flat-pants-accept.md
@@ -0,0 +1,5 @@
+---
+"@nextui-org/date-picker": patch
+---
+
+Fixes getCalendarProps to propagate the classNames in the calendarProps. (#3769)
diff --git a/packages/components/date-picker/src/use-date-picker.ts b/packages/components/date-picker/src/use-date-picker.ts
index 5f7ebd0245..45f48c6127 100644
--- a/packages/components/date-picker/src/use-date-picker.ts
+++ b/packages/components/date-picker/src/use-date-picker.ts
@@ -204,8 +204,11 @@ export function useDatePicker<T extends DateValue>({
       ...ariaCalendarProps,
       ...calendarProps,
       classNames: {
-        base: slots.calendar({class: classNames?.calendar}),
-        content: slots.calendarContent({class: classNames?.calendarContent}),
+        ...calendarProps.classNames,
+        base: slots.calendar({class: clsx(classNames?.base, calendarProps.classNames?.base)}),
+        content: slots.calendarContent({
+          class: clsx(classNames?.calendarContent, calendarProps.classNames?.content),
+        }),
       },
     };
   };