by furyu-tei
2023-11-11 [2023/11/11 11:47:49]
Twitterの個別ツイート(https://twitter.com/<name>/status/<id>)のURL(<id>)からおおよその投稿時刻を取得(2010年11月4日22時(UTC)以降のもの)
/*
* @title ツイートID→時刻変換
* @description Twitterの個別ツイート(https://twitter.com/<name>/status/<id>)のURL(<id>)からおおよその投稿時刻を取得(2010年11月4日22時(UTC)以降のもの)
* @include https://twitter.com/*
* @license MIT License
* @javascript_url
*/
(()=>{
'use strict';
const
twitter_epoch_time = 1288834974657n, // https://www.slideshare.net/pfi/id-15755280
threshold_tweet_id = 300000000000000n;
let tweet_id = (new URL(location.href).pathname.match(/^\/[^/]+\/status\/(\d+)/)||[])[1];
if (! tweet_id) {
tweet_id = prompt('Tweet ID');
if (! tweet_id) {
return;
}
}
tweet_id = BigInt(tweet_id);
if (tweet_id < threshold_tweet_id) {
alert(`Unsupported Tweet ID: ${tweet_id} (< ${threshold_tweet_id}, before 2010/11/04)`);
return;
}
let timestamp_ms = Number(twitter_epoch_time + (tweet_id>>22n)),
date_obj = new Date(timestamp_ms),
iso_timestring = date_obj.toISOString().replace(/\.\d+Z$/, 'Z');
date_obj.setMinutes(date_obj.getMinutes() - date_obj.getTimezoneOffset());
let timestring = date_obj.toISOString().replace(/T/, ' ').replace(/\.\d+Z$/, ''),
prompt_text = `
[Tweet ID] ${tweet_id}
[ISO 8601] ${iso_timestring}`,
result = prompt(prompt_text, timestring);
if (result !== null) {
navigator.clipboard.writeText(result)
.catch(error => console.info(`Copy to clipboard failed. (${error})`))
// TODO: Firefox だとエラーになる (90.0.2)
// Uncaught (in promise) DOMException: Clipboard write was blocked due to lack of user activation.
.then(() => console.debug(`Copy to clipboard succeeded. (${result})`));
}
})();