diff --git a/packages/react-use/src/use-date-format/format-date.ts b/packages/react-use/src/use-date-format/format-date.ts
index 98b3f08..27a73a5 100644
--- a/packages/react-use/src/use-date-format/format-date.ts
+++ b/packages/react-use/src/use-date-format/format-date.ts
@@ -130,7 +130,7 @@ export const formatDate = (date: Date, formatStr: string, options: FormatDateOpt
 
 export type DateLike = Date | number | string
 
-export function normalizeDate(date: DateLike) {
+export function normalizeDate(date: DateLike | null | undefined): Date {
   if (date === null) return new Date(Number.NaN) // null is invalid
   if (date === undefined) return new Date()
   if (date instanceof Date) return new Date(date)
diff --git a/packages/react-use/src/use-date-format/index.ts b/packages/react-use/src/use-date-format/index.ts
index 88c0e63..39145f7 100644
--- a/packages/react-use/src/use-date-format/index.ts
+++ b/packages/react-use/src/use-date-format/index.ts
@@ -26,7 +26,7 @@ export function useDateFormat(
   /**
    * a date object or a date string
    */
-  date: DateLike,
+  date: DateLike | null | undefined,
   /**
    * format string
    *