type=null 不循环
{{CountDown|2021/11/22|2021/11/23}}
{{CountDown|1145141919|1924927200}}
{{CountDown|1924927200|1924927200}}
2021/11/22 - 2021/11/23 1145141919 - 1924927200 1924927200 - 1924927200
type=year 按年循环
{{CountDown|10/19|10/20|type=year}}
10/19 - 10/20