diff --git a/src/hooks/useTimeConfig.ts b/src/hooks/useTimeConfig.ts
index e6ec47c87..e3b0fdc01 100644
--- a/src/hooks/useTimeConfig.ts
+++ b/src/hooks/useTimeConfig.ts
@@ -56,7 +56,7 @@ export function getTimeConfig<Config extends object>(
 
     return {
       format: 'HH:mm:ss',
-      ...timeConfig,
+      ...pickProps(timeConfig),
     };
   }
 
diff --git a/src/utils/miscUtil.ts b/src/utils/miscUtil.ts
index 1d161b59d..ffd839aaf 100644
--- a/src/utils/miscUtil.ts
+++ b/src/utils/miscUtil.ts
@@ -24,9 +24,13 @@ export function fillIndex<T extends any[]>(ori: T, index: number, value: T[numbe
   return clone;
 }
 
-export function pickProps<T extends object>(props: T, keys: (keyof T)[] | readonly (keyof T)[]) {
+/** Pick props from the key list. Will filter empty value */
+export function pickProps<T extends object>(props: T, keys?: (keyof T)[] | readonly (keyof T)[]) {
   const clone = {} as T;
-  keys.forEach((key) => {
+
+  const mergedKeys = (keys || Object.keys(props)) as typeof keys;
+
+  mergedKeys.forEach((key) => {
     if (props[key] !== undefined) {
       clone[key] = props[key];
     }
diff --git a/tests/picker.spec.tsx b/tests/picker.spec.tsx
index f6a6bdadd..97098550d 100644
--- a/tests/picker.spec.tsx
+++ b/tests/picker.spec.tsx
@@ -1275,4 +1275,22 @@ describe('Picker.Basic', () => {
 
     expect(document.querySelector('.rc-picker-dropdown')).toHaveClass('bamboo');
   });
+
+  it('showTime config should have format', () => {
+    render(
+      <DayPicker
+        showTime={{
+          format: undefined,
+        }}
+        open
+        defaultValue={getDay('2000-01-01 03:05:07')}
+      />,
+    );
+
+    // console.log(document.body.innerHTML);
+
+    expect(document.querySelector('.rc-picker-time-panel .rc-picker-header').textContent).toBe(
+      '03:05:07',
+    );
+  });
 });