Formatter function for date of latest message.

Returns a formatted date string. Default today's date is shown in 'HH:mm A' format and other dates are displayed in 'DD/MM/YY' format. This default logic is part of [ChannelPreview](https://github.com/GetStream/stream-chat-react-native/blob/master/package/src/components/ChannelPreview/ChannelPreview.tsx) <!-- TODO: Add a link here --> component.

| Type |
| - |
| `(date: Date) => string` |