Need page to redirect to another url after amp-date-countdown timeout?

## Describe the new feature or change to an existing feature you'd like to see
When i using amp-date-countdown. I am not able to redirect to url after completion of given time in timer.
I want only one feature that redirect affer timeout.

Start by locating the amp-date-countdown implementation and its existing tests. Review how timeout completion is currently exposed and determine the expected redirect behavior, including any project constraints. Done means the component can redirect to a URL after the configured countdown and the behavior is covered by tests.

Written by the indexing model from the issue text.