# Function: WeekNumber() > **WeekNumber**(`props`): `JSX.Element` Render the week number element. If `onWeekNumberClick` is passed to DayPicker, it renders a button, otherwise a span element. ## Parameters | Parameter | Type | | :------ | :------ | | `props` | [`WeekNumberProps`](../interfaces/WeekNumberProps.md) | ## Returns `JSX.Element` ## Source [src/components/WeekNumber.tsx:19](https://github.com/gpbl/react-day-picker/blob/9ad13dc72fff814dcf720a62f6e3b5ea38e8af6d/src/components/WeekNumber.tsx#L19)