diff --git a/src/shared/ui/calendar/nice-calendar-month.tsx b/src/shared/ui/calendar/nice-calendar-month.tsx
index f2ee3b2..e9488d1 100644
--- a/src/shared/ui/calendar/nice-calendar-month.tsx
+++ b/src/shared/ui/calendar/nice-calendar-month.tsx
@@ -77,6 +77,10 @@ const NiceCalendarMonth = ({
     });
   };
   const formatDay = (locale: string | undefined, date: Date) => {
+    // For Korean locale, return only the day number without '일'
+    if (currentLocale === 'ko') {
+      return date.getDate().toString();
+    }
     return date.toLocaleString(currentLocale, {
       day: 'numeric'
     });
diff --git a/src/shared/ui/calendar/nice-calendar.tsx b/src/shared/ui/calendar/nice-calendar.tsx
index 9688ce7..05fc859 100644
--- a/src/shared/ui/calendar/nice-calendar.tsx
+++ b/src/shared/ui/calendar/nice-calendar.tsx
@@ -83,6 +83,10 @@ const NiceCalendar = ({
     });
   };
   const formatDay = (locale: string | undefined, date: Date) => {
+    // For Korean locale, return only the day number without '일'
+    if (currentLocale === 'ko') {
+      return date.getDate().toString();
+    }
     return date.toLocaleString(currentLocale, {
       day: 'numeric'
     });