2026/10/02 まで (あと 194 日) 

https://qiita.com/degudegu2510/items/34f88b62be3168491483

const day = document.getElementById('day');

const hour = document.getElementById('hour');

const minute = document.getElementById('minute');

const second = document.getElementById('second');

https://goworkship.com/magazine/clock-timer-code-snippets/