A configurable and accessible React countdown component that supports ARIA-live screenreader announcements
<Countdown endAt={new Date("12/31/2018")} aria-live="polite" aria-label="count down 1" />
https://codesandbox.io/s/8kjn636pq0
endAt: instanceOf(Date).isRequired,
allowPast: bool, // True: allow negative numbers, False: stop at zero
"aria-live": string, // If a screenreader is installed, it will announce the remaining time every 10 seconds
"aria-label": string