hn-front-page-post-age-ago-vs-title.js

(() => {
	let nowTS = Date.now();
	const archiveDate = document.location.href.match(/web.archive.org\/web\/([0-9]+)/);
	if (archiveDate) {
		const c = archiveDate[1].match(/(....)(..)(..)(..)(..)(..)/);
		const d = new Date(`${c[1]}-${c[2]}-${c[3]}T${c[4]}:${c[6]}:${c[6]}Z`);
		nowTS = d.getTime();
	}
	const ageSpans = document.querySelectorAll('.age[title]');
	const data = Array.from(ageSpans).map(
		el => {
			const titleDate = el.title;
			const text = el.textContent;
			const date = new Date(titleDate + 'Z');
			const ageTS = nowTS - date.getTime();
			const hoursSinceTitleDate = msToHours(ageTS).toFixed(4);
			const diffDiff = ageTS - textAgeToMS(text);
			const id = el.closest('tr').previousElementSibling.id;
			const hoursBetweenTitleDateAndText = msToHours(diffDiff).toFixed(4);
			const postTitle = el.closest('tr').previousElementSibling.querySelector('.titleline a')?.textContent;
			return {
				titleDate,
				hoursSinceTitleDate,
				text,
				hoursBetweenTitleDateAndText,
				id,
				postTitle,
				el
			}
		}
	)

	function textAgeToMS(text) {
		const rx = /^([0-9]+)\s+(\S+)/;
		const match = text.match(rx);
		return 1000 * Number(match[1]) * {
			minute: 60, minutes: 60,
			hour: 60 * 60, hours: 60 * 60,
			day: 24 * 60 * 60, days: 24 * 60 * 60,
		} [match[2]]
	}
	function msToHours(ms) {
		return ms / 1000 / 60 / 60;
	}
	console.table(data.sort((a,b)=>b.hoursBetweenTitleDateAndText-a.hoursBetweenTitleDateAndText));
	console.log(data.map(e=>Math.round(Number(e.hoursBetweenTitleDateAndText))));
})()